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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel i5-8400T vs i7-6700K

The Intel Core i5-8400T @ 1.70GHz is newer than Intel Core i7-6700K @ 4.00GHz, while Intel Core i7-6700K @ 4.00GHz is around 17% faster in multi-threaded (CPU Mark) testing, it is around 23% faster in single-thread testing. However, Intel Core i5-8400T @ 1.70GHz uses substantially less power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 17391 benchmarks submitted from our PerformanceTest software and results and are updated daily to include new submissions.

  • The first section will show basic information for each CPU selected.
  • The additional graphs shows the CPU Mark and Single Thread values of each CPU selected.
  • An accompany graph, if price data is available, will shows the value for money, in terms of the CPU Mark/Thread Rating per dollar.
  • The last section will show approximate yearly running costs for the CPUs.

×Intel Core i5-8400T @ 1.70GHz×Intel Core i7-6700K @ 4.00GHz+ ADD
Price $113.37 - BUY $137.4 - BUY
Socket TypeFCLGA1151-2LGA1151
CPU ClassDesktopDesktop
Clockspeed1.7 GHz4.0 GHz
Turbo SpeedUp to 3.3 GHzUp to 4.2 GHz
# of Physical Cores6 (Threads: 6)4 (Threads: 8)
CacheL1: 384KB, L2: 1.5MB, L3: 9MBL1: 256KB, L2: 1.0MB, L3: 8MB
TDP35W95W
Yearly Running Cost$6.39$17.34
OtherIntel UHD Graphics 630
First Seen on ChartQ2 2018Q3 2015
# of Samples37417017
CPU Value65.865.0
Single Thread Rating(% diff. to max in group)1917(-23.5%)2504(0.0%)
CPU Mark(% diff. to max in group)7456(-16.6%)8938(0.0%)

CPU Mark Rating
As of 26th of February 2025 - Higher results represent better performance
Intel Core i5-8400T @ 1.70GHz
7,456
Intel Core i7-6700K @ 4.00GHz
8,938
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 26th of February 2025 - Higher results represent better value
Intel Core i5-8400T @ 1.70GHz
65.8
Intel Core i7-6700K @ 4.00GHz
65.0
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 26th of February 2025 - Higher results represent better performance
Intel Core i5-8400T @ 1.70GHz
1,917
Intel Core i7-6700K @ 4.00GHz
2,504
PassMark Software © 2008-2025
Estimated Energy Usage Cost
Estimated Energy Adjustable Values
Average hours of use per day Average CPU Utilization (0-100%)1 Power cost, $ per kWh2
8
25
1Average user usage is typically low and can vary from task to task. An estimate load 25% is nominal.
2Typical power costs vary around the world. Check your last power bill for details. Values of $0.15 to $0.45 per kWh are typical.
Intel Core i5-8400T @ 1.70GHz Intel Core i7-6700K @ 4.00GHz
Max TDP35W95W
Power consumption per day (kWh)NANA
Running cost per dayNANA
Power consumption per year (kWh)NANA
Running cost per yearNANA
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.