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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel Core2 Duo E8400 vs i9-9900K

The Intel Core i9-9900K @ 3.60GHz is newer than Intel Core2 Duo E8400 @ 3.00GHz and is significantly faster in multi-threaded (CPU Mark) testing and is significantly faster in single-thread testing. However, Intel Core i9-9900K @ 3.60GHz 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 21956 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 Core2 Duo E8400 @ 3.00GHz×Intel Core i9-9900K @ 3.60GHz+ ADD
Price Search Online Search Online
Socket TypeLGA775FCLGA1151-2
CPU ClassDesktopDesktop
Clockspeed3.0 GHz3.6 GHz
Turbo SpeedNot SupportedUp to 5.0 GHz
# of Physical Cores2 (Threads: 2)8 (Threads: 16)
CacheL1: 128KB, L2: 6.0MB, L3: 0MBL1: 512KB, L2: 2.0MB, L3: 16MB
TDP65W95W
Yearly Running Cost$11.86$17.34
OtherIntel UHD Graphics 630
First Seen on ChartQ4 2008Q4 2018
# of Samples729714659
CPU Value52.50.0
Single Thread Rating(% diff. to max in group)12333(-57.8%)2923(0.0%)
CPU Mark(% diff. to max in group)1210(-93.3%)18194(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.
3 - Single thread rating may be higher than the overall rating, thread performance is just one component of the CPU Mark.

CPU Mark Rating
As of 9th of April 2025 - Higher results represent better performance
Intel Core2 Duo E8400 @ 3.00GHz
1,210
Intel Core i9-9900K @ 3.60GHz
18,194
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 9th of April 2025 - Higher results represent better value
Intel Core2 Duo E8400 @ 3.00GHz
52.5
Intel Core i9-9900K @ 3.60GHz
NA
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 9th of April 2025 - Higher results represent better performance
Intel Core2 Duo E8400 @ 3.00GHz
1,233
Intel Core i9-9900K @ 3.60GHz
2,923
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 Core2 Duo E8400 @ 3.00GHz Intel Core i9-9900K @ 3.60GHz
Max TDP65W95W
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.