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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel i7-3820 vs i7-8700K

The Intel Core i7-8700K @ 3.70GHz is newer than Intel Core i7-3820 @ 3.60GHz and is significantly faster in multi-threaded (CPU Mark) testing, it is around 36% faster in single-thread testing. However, Intel Core i7-3820 @ 3.60GHz uses around 31% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 18689 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 i7-3820 @ 3.60GHz×Intel Core i7-8700K @ 3.70GHz+ ADD
Price Search Online $165 - BUY
Socket TypeLGA2011FCLGA1151-2
CPU ClassDesktopDesktop
Clockspeed3.6 GHz3.7 GHz
Turbo SpeedUp to 3.8 GHzUp to 4.7 GHz
# of Physical Cores4 (Threads: 8)6 (Threads: 12)
CacheL1: 256KB, L2: 1.0MB, L3: 10MBL1: 384KB, L2: 1.5MB, L3: 12MB
TDP130W95W
Yearly Running Cost$23.73$17.34
OtherIntel UHD Graphics 630
First Seen on ChartQ1 2012Q4 2017
# of Samples311115578
CPU Value38.282.4
Single Thread Rating(% diff. to max in group)1745(-35.9%)2723(0.0%)
CPU Mark(% diff. to max in group)5772(-57.6%)13601(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 2nd of February 2025 - Higher results represent better performance
Intel Core i7-3820 @ 3.60GHz
5,772
Intel Core i7-8700K @ 3.70GHz
13,601
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 2nd of February 2025 - Higher results represent better value
Intel Core i7-3820 @ 3.60GHz
38.2
Intel Core i7-8700K @ 3.70GHz
82.4
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 2nd of February 2025 - Higher results represent better performance
Intel Core i7-3820 @ 3.60GHz
1,745
Intel Core i7-8700K @ 3.70GHz
2,723
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 i7-3820 @ 3.60GHz Intel Core i7-8700K @ 3.70GHz
Max TDP130W95W
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.