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Intel i7-7700K vs i5-9400

The Intel Core i5-9400 @ 2.90GHz is newer than Intel Core i7-7700K @ 4.20GHz, while the multi-threaded (CPU Mark) is simliar, Intel Core i7-7700K @ 4.20GHz is around 10% faster in single-thread testing. However, Intel Core i7-7700K @ 4.20GHz uses around 38% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 14140 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 i7-7700K @ 4.20GHz×Intel Core i5-9400 @ 2.90GHz+ ADD
Price $129.99 - BUY $95.93 - BUY
Socket Type LGA 1151FCLGA1151-2
CPU ClassDesktopDesktop
Clockspeed4.2 GHz2.9 GHz
Turbo SpeedUp to 4.5 GHzUp to 4.1 GHz
# of Physical Cores4 (Threads: 8)6 (Threads: 6)
CacheL1: 256KB, L2: 1.0MB, L3: 8MBL1: 384KB, L2: 1.5MB, L3: 9MB
TDP95W65W
Yearly Running Cost$17.34$11.86
OtherIntel UHD Graphics 630
First Seen on ChartQ4 2016Q1 2019
# of Samples123821758
CPU Value74.297.7
Single Thread Rating(% diff. to max in group)2716(0.0%)2435(-10.4%)
CPU Mark(% diff. to max in group)9645(0.0%)9374(-2.8%)

CPU Mark Rating
As of 2nd of January 2025 - Higher results represent better performance
Intel Core i7-7700K @ 4.20GHz
9,645
Intel Core i5-9400 @ 2.90GHz
9,374
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 2nd of January 2025 - Higher results represent better value
Intel Core i7-7700K @ 4.20GHz
74.2
Intel Core i5-9400 @ 2.90GHz
97.7
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 2nd of January 2025 - Higher results represent better performance
Intel Core i7-7700K @ 4.20GHz
2,716
Intel Core i5-9400 @ 2.90GHz
2,435
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 i7-7700K @ 4.20GHz Intel Core i5-9400 @ 2.90GHz
Max TDP95W65W
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.