Intel Core i5-6600K vs Intel Core i5-6600T vs Intel Core i5-6400T

Intel Core i5-6600K

► remove Intel 6600K

The Intel Core i5-6600K is a high-end quad-core desktop processor based on the Skylake architecture, which was announced in August 2015. The CPU, which is manufactured in a 14 nm process, runs at 3.5 up to 3.9 GHz (2 cores: 3.8 GHz, 3 cores: 3.7 GHz, 4 cores: 3.6 GHz) and – contrary to the i7-series – does not support Hyperthreading. Being a so called "K"-model, the Core i5-6600K has a free multiplier and can be easily overclocked. 

Performance

Because of the slightly slower clocks, the smaller L3-cache (6 instead of 8 MB) as well as the missing Hyperthreading support, the Core i5-6600K is about 10-30 percent slower than the top model i7-6700K. The CPU will still handle demanding applications and games without any problems.

Graphics

Graphics are handled by the integrated Intel HD Graphics 530 with 24 EUs (Execution Units), which is clocked at 350 - 1150 MHz. Compared to the HD Graphics 4600 (Haswell, 20 EUs), the performance is increased by around 25 percent. The overall GPU performance is still low-end, so modern games can, if at all, only be played smoothly with low settings. 

Power Consumption

The TDP was slightly raised from 88 to 91 Watts compared to the predecessor.

Intel Core i5-6600T

► remove

The Intel Core i5-6600T is a frugal quad-core desktop processor based on the Skylake architecture, which was announced in August 2015. The CPU, which is manufactured in a 14 nm process, runs at 2.7-3.5 GHz and does not support Hyperthreading (only 4 threads simultaneously).

Architecture

Intel uses Skylake to replace both Broadwell as well as Haswell and therefore uses one core design for all TDP classes between 4.5-45 Watts. Several improvements of the Skylake architecture include bigger Out-to-Order-Buffer, optimizations for pre-fetching as well as bigger gains by Hyperthreading. However, the changes are small for a "Tock" – a new micro architecture – in general, so the per-MHz performance is only between 5-10 % (compared to Haswell) or less than 5 % higher (compared to Broadwell), respectively.

Performance

The performance should be similar to the old Core i5-2500K desktop processor (but at a much lower TDP) as well as the mobile Core i5-6440HQ (100 MHz lower base clock and GPU Turbo clock, 10 Watts higher TDP).

Graphics

Graphics are handled by the integrated Intel HD Graphics 530 with 24 EUs (Execution Units), which is clocked at 350 - 1150 MHz. Compared to the HD Graphics 4600 (Haswell, 20 EUs), the performance is increased by around 25 percent. The overall GPU performance is still low-end, so modern games can, if at all, only be played smoothly with low settings.

Power Consumption

Intel specifies the TDP with 35 Watts, so it can also be used in notebooks (although bigger ones).

Intel Core i5-6400T

► remove

The Intel Core i5-6400T is a frugal quad-core desktop processor based on the Skylake architecture, which was announced in August 2015. The CPU, which is manufactured in a 14 nm process, runs at 2.2-2.8 GHz and does not support Hyperthreading (only 4 threads simultaneously).

Architecture

Intel uses Skylake to replace both Broadwell as well as Haswell and therefore uses one core design for all TDP classes between 4.5-45 Watts. Several improvements of the Skylake architecture include bigger Out-to-Order-Buffer, optimizations for pre-fetching as well as bigger gains by Hyperthreading. However, the changes are small for a "Tock" – a new micro architecture – in general, so the per-MHz performance is only between 5-10 % (compared to Haswell) or less than 5 % higher (compared to Broadwell), respectively.

Performance

Depending on the utilization of Hyperthreading, the performance is roughly on par with the old Core i7-2670QM mobile processor (Sandy Bridge, 2.2-2.8 GHz, Hyperthreading), but sometimes also much higher.

Graphics

Graphics are handled by the integrated Intel HD Graphics 530 with 24 EUs (Execution Units), which is clocked at 350 - 950 MHz. Compared to the HD Graphics 4600 (Haswell, 20 EUs), the performance is increased by around 25 percent. The overall GPU performance is still low-end, so modern games can, if at all, only be played smoothly with low settings.

Power Consumption

Intel specifies the TDP with 35 Watts, so it can also be used in notebooks (although bigger ones).

Intel Core i5-6600KIntel Core i5-6600TIntel Core i5-6400T
Intel Core i5 (Desktop)Intel Core i5 (Desktop)Intel Core i5 (Desktop)
SkylakeSkylakeSkylake
: Core i5 (Desktop) Skylake
» Intel Core i5-6600K3500 - 3900 MHz4 / 46 MB
Intel Core i5-65003200 - 3600 MHz4 / 46 MB
Intel Core i5-6600T2700 - 3500 MHz4 / 46 MB
Intel Core i5-64002700 - 3300 MHz4 / 46 MB
Intel Core i5-6500T2500 - 3100 MHz4 / 46 MB
Intel Core i5-6400T2200 - 2800 MHz4 / 46 MB
Intel Core i5-6600K3500 - 3900 MHz4 / 46 MB
Intel Core i5-65003200 - 3600 MHz4 / 46 MB
» Intel Core i5-6600T2700 - 3500 MHz4 / 46 MB
Intel Core i5-64002700 - 3300 MHz4 / 46 MB
Intel Core i5-6500T2500 - 3100 MHz4 / 46 MB
Intel Core i5-6400T2200 - 2800 MHz4 / 46 MB
Intel Core i5-6600K3500 - 3900 MHz4 / 46 MB
Intel Core i5-65003200 - 3600 MHz4 / 46 MB
Intel Core i5-6600T2700 - 3500 MHz4 / 46 MB
Intel Core i5-64002700 - 3300 MHz4 / 46 MB
Intel Core i5-6500T2500 - 3100 MHz4 / 46 MB
» Intel Core i5-6400T2200 - 2800 MHz4 / 46 MB
3500 - 3900 MHz2700 - 3500 MHz2200 - 2800 MHz
256 KB256 KB256 KB
1 MB1 MB1 MB
6 MB6 MB6 MB
4 / 44 / 44 / 4
91 35 35
14 14 14
FCLGA1151FCLGA1151FCLGA1151
DDR3(L)-1600/DDR4-2133 Memory Controller, AVX, AVX2, AES-NI, TSX-NI, Quick Sync, Virtualization, vPro saveDDR3(L)-1600/DDR4-2133 Memory Controller, AVX, AVX2, AES-NI, TSX-NI, Quick Sync, Virtualization, vProDDR3(L)-1600/DDR4-2133 Memory Controller, AVX, AVX2, AES-NI, TSX-NI, Quick Sync, Virtualization, vPro
iGPUIntel HD Graphics 530 (350 - 1150 MHz)Intel HD Graphics 530 (350 - 1100 MHz)Intel HD Graphics 530 (350 - 950 MHz)
$242 U.S.$192 U.S.$192 U.S.
Intel Core i5 (Desktop) 6600KIntel Core i5 (Desktop) 6600TIntel Core i5 (Desktop) 6400T

Cinebench R15 - CPU Multi 64Bit
min: 601     avg: 615     median: 601.5 (14%)     max: 654 Points
min: 418     avg: 465     median: 464.5 (11%)     max: 511 Points
420 Points (10%)
Cinebench R15 - CPU Single 64Bit
min: 161     avg: 166     median: 166 (74%)     max: 169 Points
min: 135     avg: 138     median: 138 (62%)     max: 141 Points
119 Points (53%)
Cinebench R11.5 - CPU Multi 64Bit
min: 6.93     avg: 7.1     median: 6.9 (16%)     max: 7.5 Points
min: 5.28     avg: 5.6     median: 5.6 (13%)     max: 5.88 Points
4.8 Points (11%)
Cinebench R11.5 - CPU Single 64Bit
min: 1.88     avg: 1.9     median: 1.9 (73%)     max: 2.03 Points
min: 1.5     avg: 1.6     median: 1.6 (61%)     max: 1.63 Points
1.4 Points (53%)
Cinebench R10 - Rendering Single 32Bit
6188 Points (64%)
min: 5234     avg: 5355     median: 5354.5 (55%)     max: 5475 Points
4397 Points (45%)
Cinebench R10 - Rendering Multiple CPUs 32Bit
21324 Points (36%)
min: 16473     avg: 17623     median: 17622.5 (30%)     max: 18772 Points
14798 Points (25%)
Cinebench R10 - Rendering Multiple CPUs 64Bit
29100 Points (34%)
20716 Points (24%)
18940 Points (22%)
Cinebench R10 - Rendering Single CPUs 64Bit
8370 Points (78%)
6771 Points (63%)
5740 Points (53%)
wPrime 2.10 - 1024m *
min: 318.86     avg: 323     median: 323.1 (4%)     max: 327.25 seconds
405 seconds (5%)
wPrime 2.10 - 32m *
min: 9.912     avg: 10.1     median: 10.1 (2%)     max: 10.2 seconds
12.9 seconds (3%)
WinRAR - Result
3643 KB/s (37%)
min: 3148     avg: 3151     median: 3151 (32%)     max: 3154 KB/s
2770 KB/s (28%)
X264 HD Benchmark 4.0 - Pass 2
40.1 fps (24%)
min: 32.59     avg: 33.4     median: 33.4 (20%)     max: 34.3 fps
28.1 fps (17%)
X264 HD Benchmark 4.0 - Pass 1
196 fps (68%)
min: 160.08     avg: 164     median: 163.9 (57%)     max: 167.7 fps
139 fps (48%)
TrueCrypt - Serpent Mean 100MB
0.3 GB/s (0%)
min: 0.291     avg: 0.3     median: 0.3 (0%)     max: 0.294 GB/s
0.2 GB/s (0%)
TrueCrypt - Twofish Mean 100MB
0.5 GB/s (0%)
min: 0.491     avg: 0.5     median: 0.5 (0%)     max: 0.494 GB/s
0.4 GB/s (0%)
TrueCrypt - AES Mean 100MB
3.2 GB/s (0%)
min: 2.8     avg: 2.9     median: 2.9 (0%)     max: 2.9 GB/s
2.2 GB/s (0%)
3DMark 06 - CPU - CPU Score
7413 Points (50%)
min: 5831     avg: 6276     median: 6275.5 (42%)     max: 6720 Points
5161 Points (35%)
Super Pi mod 1.5 XS 1M - 1M *
9.5 Seconds (2%)
min: 11     avg: 16.5     median: 16.5 (4%)     max: 22 Seconds
13 Seconds (3%)
Super Pi mod 1.5 XS 2M - 2M *
21.5 Seconds (1%)
min: 24     avg: 51     median: 51 (2%)     max: 78 Seconds
29 Seconds (1%)
Super Pi Mod 1.5 XS 32M - 32M *
501 Seconds (2%)
min: 575     avg: 935     median: 934.5 (4%)     max: 1294 Seconds
681 Seconds (3%)
3DMark Vantage - P CPU no PhysX 1280x1024
21951 Points (31%)
3DMark 11 - Performance Physics 1280x720
7754 points (35%)
5406 points (24%)
5475 points (25%)
3DMark - Ice Storm Standard Physics 1280x720
61050 Points (39%)
49853 Points (32%)
42400 Points (27%)
3DMark - Cloud Gate Standard Physics 1280x720
5562 Points (14%)
4769 Points (12%)
3887 Points (10%)
3DMark - Fire Strike Physics 1920x1080
7863 Points (25%)
6686 Points (21%)
5433 Points (17%)
Geekbench 3 - 32 Bit Multi-Core Score
12270 Points (22%)
min: 9886     avg: 10463     median: 10463 (19%)     max: 11040 Points
8687 Points (15%)
Geekbench 3 - 32 Bit Single-Core Score
4080 Points (84%)
min: 3473     avg: 3528     median: 3528 (72%)     max: 3583 Points
3000 Points (62%)
Geekbench 3 - 64 Bit Multi-Core Score
min: 12175     avg: 12545     median: 12544.5 (20%)     max: 12914 Points
min: 10304     avg: 10943     median: 10943 (17%)     max: 11582 Points
9133 Points (14%)
Geekbench 3 - 64 Bit Single-Core Score
min: 4160     avg: 4215     median: 4214.5 (86%)     max: 4269 Points
min: 3667     avg: 3701     median: 3700.5 (75%)     max: 3734 Points
3131 Points (64%)
Mozilla Kraken 1.1 - Total Score *
850 ms (1%)
Sunspider - 1.0 Total Score *
64.4 ms (1%)
88.2 ms (1%)
89.2 ms (1%)
Octane V2 - Total Score
43012 Points (82%)

Average Benchmarks Intel Core i5-6600K → 100%

Average Benchmarks Intel Core i5-6600T → 87%

Average Benchmarks Intel Core i5-6400T → 77%

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* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Processor Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2017-09-11)