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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel i7-6800K vs i7-5820K

The Intel Core i7-6800K @ 3.40GHz is newer than Intel Core i7-5820K @ 3.30GHz and is around 9% faster in multi-threaded (CPU Mark) testing. The Intel Core i7-6800K @ 3.40GHz is around 13% faster in single-thread testing. Both CPUs operates at simliar power levels (TDP). All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 7161 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 i7-6800K @ 3.40GHz×Intel Core i7-5820K @ 3.30GHz+ ADD
Price $58.47 - BUY $70.15 - BUY
Socket TypeLGA2011-v3LGA2011-v3
CPU ClassDesktopDesktop
Clockspeed3.4 GHz3.3 GHz
Turbo SpeedUp to 3.8 GHzUp to 3.6 GHz
# of Physical Cores6 (Threads: 12)6 (Threads: 12)
CacheL1: 384KB, L2: 1.5MB, L3: 15MBL1: 384KB, L2: 1.5MB, L3: 15MB
TDP140W140W
Yearly Running Cost$25.55$25.55
Other
First Seen on ChartQ2 2016Q3 2014
# of Samples19385223
CPU Rank15351603
CPU Value183.3140.1
Single Thread Rating(% diff. to max in group)2254(0.0%)1990(-11.7%)
CPU Mark(% diff. to max in group)10718(0.0%)9828(-8.3%)

CPU Mark Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core i7-6800K @ 3.40GHz
10,718
Intel Core i7-5820K @ 3.30GHz
9,828
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 7th of March 2026 - Higher results represent better value
Intel Core i7-6800K @ 3.40GHz
183.3
Intel Core i7-5820K @ 3.30GHz
140.1
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core i7-6800K @ 3.40GHz
2,254
Intel Core i7-5820K @ 3.30GHz
1,990
PassMark Software © 2008-2026
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 i7-6800K @ 3.40GHz Intel Core i7-5820K @ 3.30GHz
Max TDP140W140W
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.