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Kaby Lake X: Intel Core i7-7740X Review

Silvio Werner, Klaus Hinum, 07/18/2017

Intel's new Core i7-7740X for the socket 2066 proves to be the fastest CPU for gaming in the test. However, it is just a weak upgrade to Intel's Core i7-7700K that lags behind the Ryzen CPUs in multitasking due to its low core count.

The Core i7-7740X

For the original German review, see here.

With the new Core i7-7740X, we are testing one of the Kaby Lake X processors that will probably come into question for private users. The quad-core, currently priced at around 350 Euros (up to $403) requires a compatible LGA 2066 motherboard that adds another ~200 Euros (~$230).

The i7-7740X can certainly be seen as the successor of the Core i7-7700K. Both processors are equipped with four cores and an 8 MB L3 cache and both support Hyperthreading. However, the Kaby Lake X model operates with a 100 MHz higher base clock at 4.3 GHz. Then, the Turbo speed of both models is 4.5 GHz.

The following components were used as a test system: Core i7-7740X by Intel, an Asus PRIME X299 DELUXE motherboard, a DDR4-2666 by Geil, Samsung's 840 Pro SSD, and Nvidia's GeForce GTX 1080 Ti Founders Edition.

Model Cores - Threads Base Clock Turbo Clock L3 cache TDP approx. street price
Core i7-7740X 4-8 4.3 GHz 4.5 GHz 8 MB 112 watts 350 Euros ($350)
Core i7-7700K 4-8 4.2 GHz 4.5 GHz 8 MB 95 watts 330 Euros ($340)
Ryzen R7 1700X 8-16 3.4 GHz 3.8/3.5 GHz 16 MB 95 watts 360 Euros ($390)
Ryzen R5 1600 6-12 3.2 GHz 3.6 GHz 16 MB 65 watts 210 Euros ($215)

Synthetic Benchmarks

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Cinebench R15

As usual, we first look at the benchmark results based on programs designed for performance. Cinebench greatly benefits in terms of a high clock rate and a large cache when testing only one core. Not only the pure core count, but also a high number of threads being processed simultaneously via Hyperthreading play a role in when testing all cores.

When looking at just one core, Intel's Core i7-7740X proves to be currently the fastest CPU that we have tested thanks to its Turbo clock rate of 4.5 GHz. Although the score of the Core i7-7700K is one point lower, it can be considered to be on par as it can be seen as a (minor) measuring uncertainty.

Thus, the Core i7-7740X is at least 19% faster than AMD's Ryzen processors. Compared with the identically priced Ryzen 7 1700X, the Kaby Lake X model is roughly 25% faster.

However, when looking at the multi-core performance, we confirmed that its performance is equivalent  to that of the Core i7-7700K but the Ryzen CPUs are significantly superiority to both. The Ryzen 5 1600 is 16% faster thanks to two additional cores, and it is already almost 40% compared with the Ryzen 7 1700X.

Cinebench R15
CPU Single 64Bit
Intel Core i7-7740X
195 Points ∼100%
Intel Core i7-7700K
194 Points ∼99% -1%
Intel Core i9-7900X
192.74 Points ∼99% -1%
Intel Core i5-7600K
191 Points ∼98% -2%
Intel Core i7-6950X
164 Points ∼84% -16%
Intel Core i7-6950X
147 Points ∼75% -25%
AMD Ryzen 7 1800X
164 Points ∼84% -16%
AMD Ryzen 7 1700X
157 Points ∼81% -19%
AMD Ryzen 5 1500X
157 Points ∼81% -19%
Intel Core i7-7700HQ
149 Points ∼76% -24%
AMD Ryzen 5 1600
148 Points ∼76% -24%
AMD Ryzen 7 1700
147.65 Points ∼76% -24%
AMD Ryzen 5 1600
147 Points ∼75% -25%
Intel Core i7-5960X
139 Points ∼71% -29%
AMD Ryzen 5 1400
134.5 (min: 133.01) Points ∼69% -31%
Intel Xeon E5-2697 v2
105 Points ∼54% -46%
Intel Xeon E5-2680 v4
100 Points ∼51% -49%
AMD FX-8350
97 Points ∼50% -50%
CPU Multi 64Bit
Intel Core i9-7900X
2148 (min: 2133.11) Points ∼100% +117%
Intel Core i7-6950X
1859 Points ∼87% +88%
Intel Xeon E5-2680 v4
1657 Points ∼77% +68%
AMD Ryzen 7 1800X
1647 Points ∼77% +67%
AMD Ryzen 7 1700X
1557 Points ∼72% +58%
Intel Xeon E5-2697 v2
1550 Points ∼72% +57%
AMD Ryzen 7 1700
1417.69 (min: 1413.38) Points ∼66% +43%
Intel Core i7-5960X
1387 Points ∼65% +40%
AMD Ryzen 5 1600
1143 Points ∼53% +16%
AMD Ryzen 5 1600
1125 Points ∼52% +14%
Intel Core i7-7740X
988 Points ∼46%
Intel Core i7-7700K
984 Points ∼46% 0%
AMD Ryzen 5 1500X
817.5 Points ∼38% -17%
Intel Core i7-7700HQ
738 Points ∼34% -25%
AMD Ryzen 5 1400
692 (min: 676.26) Points ∼32% -30%
Intel Core i5-7600K
688 Points ∼32% -30%
AMD FX-8350
636 Points ∼30% -36%

Truecrypt

Although the Truecrypt benchmark is rather insignificant for most users, it illustrates the performance of individual processors when handling diverse encryption algorithms using different algorithms.

The Core i7-7740X manages to outperform the two Ryzen 5 1500X and 1400 models only in the subsumed performance rating, although the first costs only half as much. The Ryzen 5 1600 already operates considerably faster than the Kaby Lake model.

Performance Rating
Intel Core i9-7900X
95.2 pt ∼95%
Intel Core i7-6950X
89.2 pt ∼89%
AMD Ryzen 7 1800X
72.8 pt ∼73%
Intel Xeon E5-2697 v2
71.2 pt ∼71%
AMD Ryzen 7 1700X
69.2 pt ∼69%
Intel Xeon E5-2680 v4
68.6 pt ∼69%
Intel Core i7-5960X
60.2 pt ∼60%
AMD Ryzen 5 1600
49.9 pt ∼50%
AMD Ryzen 5 1600
45.9 pt ∼46%
Intel Core i7-7740X
43.5 pt ∼44%
Intel Core i7-7700K
43.2 pt ∼43%
AMD Ryzen 5 1500X
36.4 pt ∼36%
AMD Ryzen 5 1400
31.3 pt ∼31%
Intel Core i5-7600K
28.6 pt ∼29%
TrueCrypt
Serpent Mean 100MB
Intel Core i7-6950X
1.4 GB/s ∼100% +154%
Intel Core i9-7900X
1.2 GB/s ∼86% +118%
AMD Ryzen 7 1800X
0.945 GB/s ∼68% +72%
Intel Xeon E5-2697 v2
0.917 GB/s ∼66% +66%
AMD Ryzen 7 1700X
0.898 GB/s ∼64% +63%
Intel Xeon E5-2680 v4
0.862 GB/s ∼62% +56%
Intel Core i7-5960X
0.712 GB/s ∼51% +29%
AMD Ryzen 5 1600
0.655 GB/s ∼47% +19%
AMD Ryzen 5 1600
0.649 GB/s ∼46% +18%
Intel Core i7-7700K
0.554 GB/s ∼40% +1%
Intel Core i7-7740X
0.551 GB/s ∼39%
AMD Ryzen 5 1500X
0.465 GB/s ∼33% -16%
AMD Ryzen 5 1400
0.41 GB/s ∼29% -26%
Intel Core i5-7600K
0.367 GB/s ∼26% -33%
Twofish Mean 100MB
Intel Core i9-7900X
2.1 GB/s ∼100% +122%
Intel Core i7-6950X
1.7 GB/s ∼81% +80%
Intel Xeon E5-2697 v2
1.6 GB/s ∼76% +69%
AMD Ryzen 7 1800X
1.5 GB/s ∼71% +59%
Intel Xeon E5-2680 v4
1.4 GB/s ∼67% +48%
AMD Ryzen 7 1700X
1.4 GB/s ∼67% +48%
Intel Core i7-5960X
1.3 GB/s ∼62% +38%
AMD Ryzen 5 1600
1 GB/s ∼48% +6%
AMD Ryzen 5 1600
1 GB/s ∼48% +6%
Intel Core i7-7740X
0.944 GB/s ∼45%
Intel Core i7-7700K
0.939 GB/s ∼45% -1%
AMD Ryzen 5 1500X
0.744 GB/s ∼35% -21%
AMD Ryzen 5 1400
0.647 GB/s ∼31% -31%
Intel Core i5-7600K
0.611 GB/s ∼29% -35%
AES Mean 100MB
Intel Core i9-7900X
12.1 GB/s ∼100% +116%
Intel Core i7-6950X
10.5 GB/s ∼87% +88%
AMD Ryzen 7 1800X
9.6 GB/s ∼79% +71%
Intel Xeon E5-2680 v4
9.4 GB/s ∼78% +68%
AMD Ryzen 7 1700X
9.3 GB/s ∼77% +66%
Intel Xeon E5-2697 v2
8.7 GB/s ∼72% +55%
Intel Core i7-5960X
8.2 GB/s ∼68% +46%
AMD Ryzen 5 1600
6.7 GB/s ∼55% +20%
Intel Core i7-7740X
5.6 GB/s ∼46%
Intel Core i7-7700K
5.5 GB/s ∼45% -2%
AMD Ryzen 5 1600
5.3 GB/s ∼44% -5%
AMD Ryzen 5 1500X
4.9 GB/s ∼40% -12%
AMD Ryzen 5 1400
4.1 GB/s ∼34% -27%
Intel Core i5-7600K
3.7 GB/s ∼31% -34%

wPrime

wPrime calculates square roots in the Newton-Raphson method for quantifying the computational performance and it particularly benefits from a high core count and Hyperthreading. Unsurprisingly, the octa-core Ryzen APUs are the fastest models here. The Core i7-6940X cannot be considered due to its high price. Beyond that, the Ryzen 5 1600 is again significantly faster than the Core i7-7740X in this benchmark.

wPrime 2.0x
1024m
Intel Xeon E5-2697 v2
393.116 s * ∼100% -135%
Intel Core i5-7600K
259.5 s * ∼66% -55%
AMD Ryzen 5 1400
237.3 s * ∼60% -42%
AMD Ryzen 5 1500X
210.6 s * ∼54% -26%
Intel Core i7-7700K
169.8 s * ∼43% -2%
Intel Core i7-7740X
167.2 s * ∼43%
AMD Ryzen 5 1600
149 s * ∼38% +11%
AMD Ryzen 5 1600
149 s * ∼38% +11%
Intel Core i7-5960X
116.8 s * ∼30% +30%
AMD Ryzen 7 1700X
109 s * ∼28% +35%
AMD Ryzen 7 1800X
103 s * ∼26% +38%
Intel Core i7-6950X
94 s * ∼24% +44%
Intel Core i9-7900X
76 s * ∼19% +55%
32m
Intel Xeon E5-2697 v2
12.308 s * ∼100% -128%
Intel Core i5-7600K
8.3 s * ∼67% -54%
AMD Ryzen 5 1400
7.8 s * ∼63% -44%
AMD Ryzen 5 1500X
6.9 s * ∼56% -28%
Intel Core i7-7700K
5.5 s * ∼45% -2%
Intel Core i7-7740X
5.4 s * ∼44%
AMD Ryzen 5 1600
5.2 s * ∼42% +4%
AMD Ryzen 5 1600
5.2 s * ∼42% +4%
Intel Core i7-5960X
4.25 s * ∼35% +21%
AMD Ryzen 7 1700X
4 s * ∼32% +26%
AMD Ryzen 7 1800X
3.8 s * ∼31% +30%
Intel Core i7-6950X
3.5 s * ∼28% +35%
Intel Core i9-7900X
2.91 s * ∼24% +46%

* ... smaller is better

Further Synthetic Benchmarks

As always, we would like to present the results of other synthetic benchmarks here. Although the data of the previous test are usually confirmed, we would like to point especially to the WinRAR benchmark for reasons of transparency - it delivered reproducible yet not very comprehensible results in our Ryzen test.

Geekbench 4.0
64 Bit Multi-Core Score
Intel Core i9-7900X
27533 Points ∼100% +50%
Intel Core i7-6950X
26761 Points ∼97% +46%
Intel Core i7-5960X
22382 Points ∼81% +22%
AMD Ryzen 7 1800X
22009 Points ∼80% +20%
Intel Xeon E5-2680 v4
21194 Points ∼77% +15%
AMD Ryzen 7 1700X
21038 Points ∼76% +14%
AMD Ryzen 7 1700
19784 Points ∼72% +8%
Intel Core i7-7740X
18383 Points ∼67%
AMD Ryzen 5 1600
17937 Points ∼65% -2%
Intel Core i7-7700K
17800 Points ∼65% -3%
Intel Core i5-7600K
15030 Points ∼55% -18%
AMD Ryzen 5 1500X
14463 Points ∼53% -21%
Intel Core i7-7700HQ
14026 Points ∼51% -24%
AMD Ryzen 5 1400
12785 Points ∼46% -30%
64 Bit Single-Core Score
Intel Core i7-7740X
5619 Points ∼100%
Intel Core i7-7700K
5480 Points ∼98% -2%
Intel Core i5-7600K
5225 Points ∼93% -7%
Intel Core i9-7900X
4987 Points ∼89% -11%
AMD Ryzen 7 1800X
4499 Points ∼80% -20%
AMD Ryzen 7 1700X
4333 Points ∼77% -23%
Intel Core i7-7700HQ
4321 Points ∼77% -23%
AMD Ryzen 7 1700
4179 Points ∼74% -26%
AMD Ryzen 5 1500X
4149 Points ∼74% -26%
AMD Ryzen 5 1600
4130 Points ∼74% -26%
Intel Core i7-6950X
4049 Points ∼72% -28%
Intel Core i7-5960X
3980 Points ∼71% -29%
AMD Ryzen 5 1400
3885 Points ∼69% -31%
Intel Xeon E5-2680 v4
2961 Points ∼53% -47%
WinRAR - Result
Intel Core i7-6950X
8450 KB/s ∼100% +32%
Intel Xeon E5-2697 v2
7269 KB/s ∼86% +13%
Intel Core i7-5960X
7049 KB/s ∼83% +10%
Intel Core i7-7740X
6417 KB/s ∼76%
Intel Xeon E5-2680 v4
6323 KB/s ∼75% -1%
Intel Core i9-7900X
5918 KB/s ∼70% -8%
Intel Core i7-7700K
5823 KB/s ∼69% -9%
AMD Ryzen 7 1800X
4120 KB/s ∼49% -36%
AMD Ryzen 7 1700X
3999 KB/s ∼47% -38%
AMD Ryzen 5 1500X
3910 KB/s ∼46% -39%
AMD Ryzen 5 1600
3687 KB/s ∼44% -43%
Intel Core i5-7600K
3570 KB/s ∼42% -44%
AMD Ryzen 5 1400
3147 KB/s ∼37% -51%
X264 HD Benchmark 4.0
Pass 2
Intel Core i9-7900X
121 fps ∼100% +96%
Intel Core i7-6950X
101 fps ∼83% +64%
AMD Ryzen 7 1800X
95 fps ∼79% +54%
AMD Ryzen 7 1700X
90.6 fps ∼75% +47%
Intel Xeon E5-2697 v2
85.16 fps ∼70% +38%
Intel Core i7-5960X
82.3 fps ∼68% +33%
Intel Xeon E5-2680 v4
79.1 fps ∼65% +28%
AMD Ryzen 5 1600
68.7 fps ∼57% +11%
Intel Core i7-7740X
61.7 (min: 61.6) fps ∼51%
Intel Core i7-7700K
61.6 fps ∼51% 0%
AMD Ryzen 5 1500X
49.5 fps ∼41% -20%
Intel Core i5-7600K
46.2 fps ∼38% -25%
AMD Ryzen 5 1400
43.4 fps ∼36% -30%
Pass 1
Intel Core i7-7740X
233.6 (min: 231.9) fps ∼100%
Intel Core i7-7700K
230 fps ∼98% -2%
Intel Core i5-7600K
223 fps ∼95% -5%
Intel Core i9-7900X
217 fps ∼93% -7%
Intel Core i7-6950X
196 fps ∼84% -16%
AMD Ryzen 7 1800X
195 fps ∼83% -17%
Intel Core i7-5960X
191 fps ∼82% -18%
AMD Ryzen 7 1700X
186 fps ∼80% -20%
AMD Ryzen 5 1600
177 fps ∼76% -24%
AMD Ryzen 5 1500X
177 fps ∼76% -24%
Intel Xeon E5-2697 v2
164.84 fps ∼71% -29%
AMD Ryzen 5 1400
154 fps ∼66% -34%
Intel Xeon E5-2680 v4
136.6 fps ∼58% -42%
PCMark 8
Work Score Accelerated v2
Intel Core i9-7900X
5325 Points ∼100% +7%
Intel Core i7-7700HQ
5234 Points ∼98% +5%
Intel Core i7-7700K
5167 Points ∼97% +4%
Intel Core i7-7740X
4977 Points ∼93%
AMD Ryzen 5 1500X
4557 Points ∼86% -8%
Intel Xeon E5-2697 v2
4529 Points ∼85% -9%
AMD Ryzen 7 1800X
4511 Points ∼85% -9%
AMD Ryzen 7 1700X
4487 Points ∼84% -10%
Intel Core i7-6950X
4451 Points ∼84% -11%
AMD Ryzen 5 1600
4431 Points ∼83% -11%
Intel Core i7-5960X
4413 Points ∼83% -11%
AMD Ryzen 7 1700
4402 Points ∼83% -12%
AMD Ryzen 5 1400
4401 Points ∼83% -12%
Home Score Accelerated v2
Intel Core i7-7740X
5347 Points ∼100%
Intel Core i9-7900X
5239 Points ∼98% -2%
Intel Core i7-7700K
5042 Points ∼94% -6%
Intel Core i5-7600K
4749 Points ∼89% -11%
AMD Ryzen 7 1800X
4746 Points ∼89% -11%
AMD Ryzen 5 1500X
4647 Points ∼87% -13%
Intel Core i7-4790K
4624 Points ∼86% -14%
AMD Ryzen 7 1700X
4613 Points ∼86% -14%
AMD Ryzen 7 1700
4485 Points ∼84% -16%
AMD Ryzen 5 1600
4437 Points ∼83% -17%
AMD Ryzen 5 1400
4346 Points ∼81% -19%
Intel Core i7-6950X
4323 Points ∼81% -19%
Intel Core i7-5960X
4122 Points ∼77% -23%
Intel Core i7-7700HQ
4069 Points ∼76% -24%
Intel Xeon E5-2697 v2
3816 Points ∼71% -29%
3DMark
2560x1440 Time Spy CPU
Intel Core i9-7900X
10131 Points ∼100% +80%
Intel Core i7-6950X
9697 Points ∼96% +72%
Intel Xeon E5-2680 v4
8470 Points ∼84% +50%
AMD Ryzen 7 1800X
8252 Points ∼81% +47%
Intel Core i7-5960X
7884 Points ∼78% +40%
AMD Ryzen 7 1700X
7806 Points ∼77% +39%
AMD Ryzen 7 1700X
7806 Points ∼77% +39%
AMD Ryzen 7 1700
7415 Points ∼73% +32%
Intel Core i7-7740X
5632 Points ∼56%
AMD Ryzen 5 1600
5542 Points ∼55% -2%
Intel Core i7-7700K
5490 Points ∼54% -3%
Intel Core i7-4790K
4970 Points ∼49% -12%
Intel Core i7-7700HQ
4189 Points ∼41% -26%
Intel Core i5-7600K
4152 Points ∼41% -26%
AMD Ryzen 5 1500X
4067 Points ∼40% -28%
AMD Ryzen 5 1400
3700 Points ∼37% -34%
1920x1080 Fire Strike Physics
Intel Core i9-7900X
22626 Points ∼100% +57%
Intel Core i7-6950X
21692 Points ∼96% +50%
AMD Ryzen 7 1800X
18915 Points ∼84% +31%
AMD Ryzen 7 1700X
18407 Points ∼81% +28%
Intel Core i7-5960X
16942 Points ∼75% +17%
AMD Ryzen 7 1700
16830 Points ∼74% +17%
Intel Xeon E5-2697 v2
16522 Points ∼73% +14%
Intel Xeon E5-2680 v4
16369 Points ∼72% +13%
AMD Ryzen 5 1600
15818 Points ∼70% +10%
Intel Core i7-7740X
14432 Points ∼64%
Intel Core i7-7700K
14325 Points ∼63% -1%
Intel Core i7-4790K
12492 Points ∼55% -13%
AMD Ryzen 5 1400
10848 Points ∼48% -25%
Intel Core i7-7700HQ
10455 Points ∼46% -28%
Intel Core i5-7600K
9292 Points ∼41% -36%
3DMark 11 - 1280x720 Performance Physics
Intel Core i7-6950X
16403 Points ∼100% +33%
Intel Core i9-7900X
15260 Points ∼93% +24%
Intel Core i7-5960X
15217 Points ∼93% +23%
AMD Ryzen 7 1800X
14150 Points ∼86% +15%
Intel Xeon E5-2697 v2
13219 Points ∼81% +7%
AMD Ryzen 7 1700
13124 Points ∼80% +7%
Intel Xeon E5-2680 v4
13047 Points ∼80% +6%
Intel Core i7-7740X
12322 Points ∼75%
Intel Core i7-7700K
12026 Points ∼73% -2%
AMD Ryzen 5 1600
11164 Points ∼68% -9%
Intel Core i7-4790K
11053 Points ∼67% -10%
AMD Ryzen 5 1500X
9566 Points ∼58% -22%
Intel Core i7-7700HQ
9462 Points ∼58% -23%
AMD Ryzen 5 1400
8177 Points ∼50% -34%
3DMark 06 - CPU - ---
Intel Core i9-7900X
12678 Points ∼100% +24%
Intel Core i7-6950X
10658 Points ∼84% +4%
Intel Core i7-7740X
10229 Points ∼81%
Intel Core i7-7700K
10156 Points ∼80% -1%
Intel Core i7-5960X
9924 Points ∼78% -3%
AMD Ryzen 7 1700
8940 Points ∼71% -13%
Intel Xeon E5-2697 v2
8843 Points ∼70% -14%
Intel Core i5-7600K
8532 Points ∼67% -17%
AMD Ryzen 5 1600
8222 Points ∼65% -20%
Intel Xeon E5-2680 v4
8174 Points ∼64% -20%
Intel Core i7-7700HQ
7761 Points ∼61% -24%
AMD Ryzen 5 1500X
7403 Points ∼58% -28%
AMD Ryzen 5 1400
6599 Points ∼52% -35%

Intermediate Verdict

The i7-7740X Kaby Lake processor presents a similar performance as Intel's Core i7-7700K, at least in the synthetic benchmarks, which is not surprising since in fact they are identical in terms of architecture. The 100 MHz higher base clock is also virtually irrelevant for these benchmarks since both processors support Turbo Boost 2.0 and jump to the same Turbo clock speed.

In summary, the i7-7740X always has an advantage over the Ryzen competition in single-core performance scenarios. Even equally priced AMD models clearly outrun the 7740X in multi-core applications, which is not baffling in view of four cores.

Gaming Benchmarks

Test System

To exclude limitations by the GPU and to create acceptable comparison conditions, we used one of the currently fastest available GPUs with the GeForce GTX 1080 Ti in the Founders Edition. The Skylake X model was tested on an Asus Prime X299-A with 16 GB of DDR4-2666 RAM in dual-channel mode. The test system for the Ryzen and other Intel models is described extensively in the reviews of the Ryzen 7 1700, 1700X and 1800X. A GTX 1080 Ti was also used here.

Frame Rates

Intel's Core i7-7740X appropriately takes the first place in “The Witcher 3” benchmark using low details and a resolution of 1024x768 pixels - at least in terms of the average frame rate.

Compared with the in-house competition, the performance advantage is relatively low. Intel's Core i7-4790K is only 2% slower, and the Kaby Lake model's equivalent, the i7-7700K, only by 4% in the synthetic benchmarks.

The advantage over AMD's Ryzen CPUs is at least 10%. The Ryzen 7 1700, which is currently approximately 50 Euros (~$57) cheaper, is roughly 16% slower - and seen in relation just as much lower in price.

Farming Simulator 17” allows us to quantify the CPU performance even in high detail settings and 4K resolution since the application is extremely CPU-driven. The Core i7-7740X almost manages the first place also in this benchmark. The Ryzen models first follow at a distance of at least 8%. In the For Honor test, the result of Intel's Core i7-7700K is definitely an outlier that we have nevertheless listed for reasons of transparency.

For Honor
3840x2160 High Preset AA:T AF:8x
Intel Xeon E5-2680 v4
79 (min: 47) fps ∼100% 0%
Intel Core i7-7700K
79 (min: 46) fps ∼100% 0%
Intel Core i7-7740X
79 (min: 63) fps ∼100%
Intel Core i7-6950X
78 (min: 50) fps ∼99% -1%
AMD Ryzen 7 1700
78 (min: 63) fps ∼99% -1%
Intel Core i9-7900X
78 (min: 62) fps ∼99% -1%
Intel Core i5-7600K
77.9 (min: 23) fps ∼99% -1%
AMD Ryzen 5 1500X
77.8 (min: 63) fps ∼98% -2%
AMD Ryzen 5 1400
77.6 (min: 63) fps ∼98% -2%
AMD Ryzen 5 1600
77.1 (min: 62) fps ∼98% -2%
Intel Core i7-4790K
77 (min: 58) fps ∼97% -3%
AMD Ryzen 7 1800X
77 (min: 62) fps ∼97% -3%
Intel Core i7-5960X
76 (min: 30) fps ∼96% -4%
1280x720 Low Preset
Intel Core i7-7740X
347 (min: 240) fps ∼100%
Intel Core i7-7700K
333 (min: 184) fps ∼96% -4%
Intel Core i7-4790K
318 (min: 198) fps ∼92% -8%
AMD Ryzen 5 1500X
271 (min: 193) fps ∼78% -22%
Intel Core i5-7600K
263 (min: 17) fps ∼76% -24%
AMD Ryzen 5 1600
250 (min: 187) fps ∼72% -28%
Intel Xeon E5-2680 v4
248 (min: 86) fps ∼71% -29%
AMD Ryzen 5 1400
233 (min: 145) fps ∼67% -33%
AMD Ryzen 7 1800X
230 (min: 187) fps ∼66% -34%
Intel Core i7-5960X
224 (min: 168) fps ∼65% -35%
AMD Ryzen 7 1700
208 (min: 159) fps ∼60% -40%
Intel Core i7-6950X
161 (min: 125) fps ∼46% -54%
Intel Core i9-7900X
155 (min: 129) fps ∼45% -55%
Farming Simulator 17 - 3840x2160 High Preset AA:2xMS AF:2x
Intel Core i7-7740X
213 (min: 195) fps ∼100%
Intel Core i7-6950X
211 (min: 195) fps ∼99% -1%
Intel Core i5-7600K
205 (min: 191) fps ∼96% -4%
Intel Core i7-4790K
204 (min: 190) fps ∼96% -4%
Intel Core i7-7700K
204 (min: 188) fps ∼96% -4%
Intel Core i9-7900X
201 (min: 186) fps ∼94% -6%
AMD Ryzen 5 1500X
195 (min: 188) fps ∼92% -8%
Intel Core i7-5960X
191 (min: 175) fps ∼90% -10%
AMD Ryzen 7 1800X
191 (min: 180) fps ∼90% -10%
AMD Ryzen 5 1600
188 (min: 177) fps ∼88% -12%
AMD Ryzen 7 1700
181 (min: 172) fps ∼85% -15%
Intel Xeon E5-2680 v4
179 (min: 167) fps ∼84% -16%
AMD Ryzen 5 1400
170 (min: 164) fps ∼80% -20%
The Witcher 3
1920x1080 Ultra Graphics & Postprocessing (HBAO+)
Intel Core i7-7740X
102 (min: 87) fps ∼100%
Intel Core i7-7700K
100 (min: 86) fps ∼98% -2%
Intel Core i7-6950X
99 (min: 85) fps ∼97% -3%
Intel Core i7-4790K
98 (min: 83) fps ∼96% -4%
AMD Ryzen 7 1700
98 fps ∼96% -4%
AMD Ryzen 7 1800X
97 (min: 83) fps ∼95% -5%
Intel Core i9-7900X
97 (min: 80) fps ∼95% -5%
AMD Ryzen 5 1500X
96.4 (min: 84) fps ∼95% -5%
AMD Ryzen 5 1400
96.3 (min: 83) fps ∼94% -6%
AMD Ryzen 5 1600
95 (min: 80) fps ∼93% -7%
Intel Xeon E5-2680 v4
89.5 (min: 77) fps ∼88% -12%
1024x768 Low Graphics & Postprocessing
Intel Core i9-7900X
349 (min: 260) fps ∼100% +7%
Intel Core i7-7740X
327 (min: 258) fps ∼94%
Intel Core i7-4790K
322 (min: 297) fps ∼92% -2%
Intel Core i7-6950X
317 (min: 279) fps ∼91% -3%
Intel Core i7-7700K
313 (min: 284) fps ∼90% -4%
AMD Ryzen 7 1800X
297 (min: 267) fps ∼85% -9%
AMD Ryzen 7 1700
274 (min: 243) fps ∼79% -16%
Intel Xeon E5-2680 v4
269.8 (min: 234) fps ∼77% -17%
AMD Ryzen 5 1600
254 (min: 237) fps ∼73% -22%
AMD Ryzen 5 1500X
250 (min: 226) fps ∼72% -24%
AMD Ryzen 5 1400
225 (min: 202) fps ∼64% -31%

Frame Time Course

The Core i7-7740X also proves to be a very fast processor in the frame time analysis and primarily confirms the determined frame rates. The Kaby Lake X processor displays only a few slips and leads the frame rates course over large parts of the benchmark. In the comparison with the Ryzen 7 1700 and Ryzen 5 1600, a general difference in the frame rates is seen. The Core i7-7700K operates with a slightly lower fluctuation margin on average than the Core i7-7700K.

Frametimes in the course
Frametimes in the course
Model Core i7-7740X Core i7-4790K Ryzen R7 1700 Ryzen R5 1600 Ryzen R5 1400
Frame time (Median, in µs) 3032 3084 3823 3840 6527
approx. min. deviation 20% 1.891% 2.711% 1.129% 1.104% 3.771%
approx. min. deviation 50% 0.266% 0.276% 0.213% 0.176% 0.862%
approx. min. deviation 100% 0.091% 0.049% 0.066% 0.047% 0.284%
approx. min. deviation 300% 0.032% 0.005% 0.053% 0.020% 0.046%

Energy Efficiency

Before everything else: Since the power consumption on different motherboards is determined as a sum parameter, there may be significant deviations in the idle power consumption in particular, depending on the motherboard used. Thus, according to the findings and also in line with the results from other publications, Intel's Core i7-7740X has an approximately 16% higher idle power consumption than the comparable Core i7-. The difference shrinks to approximately 6 watts (11%) in the comparison with the mid-range Ryzen APUs.

The actual energy efficiency between the Core i7-7740X and Core i7-7700K during load differs only slightly. The Kaby Lake X model cannot compete with the extremely energy efficient Ryzen models here.

Idle power consumption
Idle power consumption
Energy efficiency in points per watt
Energy efficiency in points per watt

Verdict

With the Core i7-7740X, Intel basically proves that performance capable CPUs are also possible for the LGA 2066 socket that is not affected by high power consumption or temperature issues.

However, it is ultimately a refresh of the Core i7-7700K that is in fact absolutely equal in the benchmarks and that does not have a (for players usually irrelevant) graphics card. Since the Core i7-7700K is just as expensive, but runs on a cheaper 1150 motherboard, there is no reason for 1150 motherboard owners to swap it for a Core i7-7700X plus a new motherboard.

Compared with the latest Ryzen APUs, a sometimes significant performance advantage due to higher clock rates can be seen in the gaming benchmarks. However, their practical relevance is rather low, as illustrated above. Applications that are optimized for multiple cores clearly benefit from the twice as high core count of similarly priced Ryzen APUs - this will also probably be true for games in the future.

Review Samples

The review samples for this test report were mainly provided by Intel (CPU), AMD (Ryzen APUs), Asus boards and memory kit, Noctua cooler. Intel loaned us the Core i7-6950X and i7-5960X. The X99-E motherboard and X299 motherboard came from Asus. Noctua provided us with an NH-U12S cooler for AMD AM4 and X99/X299 board.

Appendix

Intel Core i7-7740X

SeriesIntel Core i7 (Desktop)
CodenameKaby Lake X
Clock Rate4300 - 4500 MHz
Level 1 Cache256 KB
Level 2 Cache1 MB
Level 3 Cache8 MB
Number of Cores / Threads4 / 8
Max. Power Consumption (TDP = Thermal Design Power)112 Watt
Manufacturing Technology14 nm
SocketFCLGA-2066
FeaturesDDR4-2666 Memory Controller, HyperThreading, AVX, AVX2, AES-NI, TSX-NI, Quick Sync, Virtualization, vPro
64 Bit64 Bit support
Announcement Date05/30/2017

Benchmarks

Cinebench R10 - Rendering Single 32Bit
7395 Points (100%)
wPrime 2.0x - 1024m *
167.2 seconds (2%)
wPrime 2.0x - 32m *
5.4 seconds (1%)
Super Pi mod 1.5 XS 1M *
8.1 Seconds (2%)
Super Pi Mod 1.5 XS 32M *
449 Seconds (2%)
Power Consumption - Prime95 V28,10 Stress Power Consumption (external Monitor) ultra *
152 Watt (66%)
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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