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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel i7-8665UE vs i5-8257U

The Intel Core i7-8665UE @ 1.70GHz is newer than Intel Core i5-8257U @ 1.40GHz and is around -33% slower in multi-threaded (CPU Mark) testing. The Intel Core i7-8665UE @ 1.70GHz is around -29% slower in single-thread testing. Both CPUs operates at simliar power levels (TDP). All the CPUs in this comparison belong in the Laptop CPU Class. The values below were tabulated from a combined 638 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 i7-8665UE @ 1.70GHz×Intel Core i5-8257U @ 1.40GHz+ ADD
Price Search Online Search Online
Socket TypeFCBGA1528FCBGA1528
CPU ClassLaptopLaptop
Clockspeed1.7 GHz1.4 GHz
Turbo SpeedUp to 4.4 GHzUp to 3.9 GHz
# of Physical Cores4 (Threads: 8)4 (Threads: 8)
CacheL1: 256KB, L2: 1.0MB, L3: 8MBL1: 256KB, L2: 1.0MB, L3: 6MB
TDP15W15W
Yearly Running Cost$2.74$2.74
OtherIntel UHD Graphics 620Intel Iris Plus Graphics 645
First Seen on ChartQ4 2019Q4 2019
# of Samples14624
CPU Value12.323.2
Single Thread Rating(% diff. to max in group)1602(-28.9%)2253(0.0%)
CPU Mark(% diff. to max in group)5013(-32.6%)7434(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 14th of July 2025 - Higher results represent better performance
Intel Core i7-8665UE @ 1.70GHz
5,013
Intel Core i5-8257U @ 1.40GHz
7,434
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 14th of July 2025 - Higher results represent better value
Intel Core i7-8665UE @ 1.70GHz
12.3
Intel Core i5-8257U @ 1.40GHz
23.2
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 14th of July 2025 - Higher results represent better performance
Intel Core i7-8665UE @ 1.70GHz
1,602
Intel Core i5-8257U @ 1.40GHz
2,253
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 i7-8665UE @ 1.70GHz Intel Core i5-8257U @ 1.40GHz
Max TDP15W15W
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.