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

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 i5-6400

► remove

The Intel Core i5-6400 is a desktop class quad-core CPU. The additional 4 threads are not available to the CPU as it is missing the HyperThreading support. The i5-6400 is based on Skylake architecture and clocks within the 2.7 GHz to 3.3 GHz range. 

Intel Core i5-6600KIntel Core i5-6600TIntel Core i5-6400
Intel Core i5 (Desktop)Intel Core i5 (Desktop)Intel Core i5 (Desktop)
SkylakeSkylakeSkylake
: Core i5 (Desktop) Skylake
» Intel Core i5-6600K3.5 - 3.9 GHz4 / 46 MB
Intel Core i5-65003.2 - 3.6 GHz4 / 46 MB
Intel Core i5-6600T2.7 - 3.5 GHz4 / 46 MB
Intel Core i5-64002.7 - 3.3 GHz4 / 46 MB
Intel Core i5-6500T2.5 - 3.1 GHz4 / 46 MB
Intel Core i5-6400T2.2 - 2.8 GHz4 / 46 MB
Intel Core i5-6600K3.5 - 3.9 GHz4 / 46 MB
Intel Core i5-65003.2 - 3.6 GHz4 / 46 MB
» Intel Core i5-6600T2.7 - 3.5 GHz4 / 46 MB
Intel Core i5-64002.7 - 3.3 GHz4 / 46 MB
Intel Core i5-6500T2.5 - 3.1 GHz4 / 46 MB
Intel Core i5-6400T2.2 - 2.8 GHz4 / 46 MB
Intel Core i5-6600K3.5 - 3.9 GHz4 / 46 MB
Intel Core i5-65003.2 - 3.6 GHz4 / 46 MB
Intel Core i5-6600T2.7 - 3.5 GHz4 / 46 MB
» Intel Core i5-64002.7 - 3.3 GHz4 / 46 MB
Intel Core i5-6500T2.5 - 3.1 GHz4 / 46 MB
Intel Core i5-6400T2.2 - 2.8 GHz4 / 46 MB
3500 - 3900 MHz2700 - 3500 MHz2700 - 3300 MHz
256 KB256 KB256 KB
1 MB1 MB1 MB
6 MB6 MB6 MB
4 / 44 / 44 / 4
91 35 65
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)
Architecturex86x86x86
$242 U.S.$192 U.S.$187 U.S.
Intel Core i5 (Desktop) 6600KIntel Core i5 (Desktop) 6600TIntel Core i5 (Desktop) 6400

Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 601     avg: 615     median: 601.5 (13%)     max: 654 Points
min: 418     avg: 465     median: 464.5 (10%)     max: 511 Points
510 Points (11%)
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 161     avg: 166     median: 166 (61%)     max: 169 Points
min: 135     avg: 138     median: 138 (51%)     max: 141 Points
134 Points (49%)
Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
min: 6.93     avg: 7.1     median: 6.9 (14%)     max: 7.5 Points
min: 5.28     avg: 5.6     median: 5.6 (11%)     max: 5.88 Points
5.9 Points (12%)
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
min: 1.88     avg: 1.9     median: 1.9 (60%)     max: 2.03 Points
min: 1.5     avg: 1.6     median: 1.6 (50%)     max: 1.63 Points
1.5 Points (48%)
Cinebench R10 - Cinebench R10 Rend. Single (32bit)
6188 (55%)
min: 5234     avg: 5355     median: 5354.5 (48%)     max: 5475
5088 (45%)
Cinebench R10 - Cinebench R10 Rend. Multi (32bit)
21324 (36%)
min: 16473     avg: 17623     median: 17622.5 (30%)     max: 18772
18297 (31%)
Cinebench R10 - Cinebench R10 Rend. Multi (64bit)
100%
1 6600K +
29100 Points (28%)
71%
1 6600T +
20716 Points (20%)
Cinebench R10 - Cinebench R10 Rend. Single (64bit)
100%
1 6600K +
8370 Points (63%)
81%
1 6600T +
6771 Points (51%)
wPrime 2.10 - wPrime 2.0 1024m *
100%
1 6600T +
min: 318.86     avg: 323     median: 323.1 (4%)     max: 327.25 s
100%
1 6400 +
327 s (4%)
wPrime 2.10 - wPrime 2.0 32m *
100%
1 6600T +
min: 9.912     avg: 10.1     median: 10.1 (2%)     max: 10.2 s
100%
1 6400 +
10.5 s (2%)
WinRAR - WinRAR 4.0
100%
1 6600K +
3643 (23%)
86%
1 6600T +
min: 3148     avg: 3151     median: 3151 (20%)     max: 3154
X264 HD Benchmark 4.0 - x264 Pass 2
40.1 fps (18%)
min: 32.59     avg: 33.4     median: 33.4 (15%)     max: 34.3 fps
33.9 fps (15%)
X264 HD Benchmark 4.0 - x264 Pass 1
196 fps (58%)
min: 160.08     avg: 164     median: 163.9 (48%)     max: 167.7 fps
150 fps (44%)
TrueCrypt - TrueCrypt Serpent
0.3 GB/s (0%)
min: 0.291     avg: 0.3     median: 0.3 (0%)     max: 0.294 GB/s
0.3 GB/s (0%)
TrueCrypt - TrueCrypt Twofish
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 - TrueCrypt AES
3.2 GB/s (0%)
min: 2.8     avg: 2.9     median: 2.9 (0%)     max: 2.9 GB/s
2.7 GB/s (0%)
3DMark 06 - CPU - 3DMark 06 - CPU
100%
1 6600K +
7413 Points (41%)
85%
1 6600T +
min: 5831     avg: 6276     median: 6275.5 (35%)     max: 6720 Points
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
9.5 s (2%)
min: 11     avg: 16.5     median: 16.5 (4%)     max: 22 s
12 s (3%)
Super Pi mod 1.5 XS 2M - Super Pi mod 1.5 XS 2M *
21.5 s (1%)
min: 24     avg: 51     median: 51 (2%)     max: 78 s
100%
6400 +
27.6 s (1%)
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
501 s (2%)
min: 575     avg: 935     median: 934.5 (4%)     max: 1294 s
660 s (3%)
3DMark Vantage - 3DM Vant. Perf. CPU no Physx
100%
1 6600K +
21951 Points (25%)
3DMark 11 - 3DM11 Performance Physics
7754 Points (33%)
5406 Points (23%)
6283 Points (27%)
3DMark - 3DMark Ice Storm Physics
61050 Points (39%)
49853 Points (32%)
48092 Points (31%)
3DMark - 3DMark Ice Storm Extreme Physics
100%
1 6400 +
50839 Points (54%)
3DMark - 3DMark Ice Storm Unlimited Physics
100%
1 6400 +
53239 Points (55%)
3DMark - 3DMark Cloud Gate Physics
5562 Points (14%)
4769 Points (12%)
4894 Points (12%)
3DMark - 3DMark Fire Strike Standard Physics
7863 Points (20%)
6686 Points (17%)
6903 Points (17%)
Geekbench 3 - Geekbench 3 32 Bit Multi-Core
100%
1 6600K +
12270 (22%)
85%
1 6600T +
min: 9886     avg: 10463     median: 10463 (19%)     max: 11040
Geekbench 3 - Geekbench 3 32 Bit Single-Core
100%
1 6600K +
4080 (84%)
86%
1 6600T +
min: 3473     avg: 3528     median: 3528 (72%)     max: 3583
Geekbench 3 - Geekbench 3 64 Bit Multi-Core
100%
1 6600K +
min: 12175     avg: 12545     median: 12544.5 (20%)     max: 12914
87%
1 6600T +
min: 10304     avg: 10943     median: 10943 (17%)     max: 11582
Geekbench 3 - Geekbench 3 64 Bit Single-Core
100%
1 6600K +
min: 4160     avg: 4215     median: 4214.5 (86%)     max: 4269
88%
1 6600T +
min: 3667     avg: 3701     median: 3700.5 (75%)     max: 3734
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
100%
1 6600K +
850 ms (1%)
Sunspider - Sunspider 1.0 Total Score *
64.4 ms (1%)
88.2 ms (1%)
100%
6400 +
82.9 ms (1%)
Octane V2 - Octane V2 Total Score
100%
1 6600K +
43012 Points (72%)

Average Benchmarks Intel Core i5-6600K → 100% n=19

Average Benchmarks Intel Core i5-6600T → 87% n=19

Average Benchmarks Intel Core i5-6400 → 87% n=19

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

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Redaktion, 2017-09- 8 (Update: 2017-09-11)