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Intel i7-4940MX vs i7-8665U

The Intel Core i7-8665U @ 1.90GHz is newer than Intel Core i7-4940MX @ 3.10GHz and is around -9% slower in multi-threaded (CPU Mark) testing. However the CPUs have comparable single-thread rating. Also, Intel Core i7-8665U @ 1.90GHz uses substantially less power. All the CPUs in this comparison belong in the Laptop CPU Class. The values below were tabulated from a combined 2640 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 i7-4940MX @ 3.10GHz×Intel Core i7-8665U @ 1.90GHz+ ADD
Price Search Online Search Online
Socket TypeFPGA946,FPGA947FCBGA1528
CPU ClassLaptopLaptop
Clockspeed3.1 GHz1.9 GHz
Turbo SpeedUp to 4.0 GHzUp to 4.8 GHz
# of Physical Cores4 (Threads: 8)4 (Threads: 8)
CacheL1: 256KB, L2: 1.0MB, L3: 8MBL1: 256KB, L2: 1.0MB, L3: 8MB
TDP57W15W
Yearly Running Cost$10.40$2.74
OtherIntel UHD Graphics 620
First Seen on ChartQ1 2014Q2 2019
# of Samples2202420
CPU Rank19972118
CPU Value9.78.8
Single Thread Rating(% diff. to max in group)2178(0.0%)2163(-0.7%)
CPU Mark(% diff. to max in group)6792(0.0%)6189(-8.9%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core i7-4940MX @ 3.10GHz
6,792
Intel Core i7-8665U @ 1.90GHz
6,189
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 7th of March 2026 - Higher results represent better value
Intel Core i7-4940MX @ 3.10GHz
9.7
Intel Core i7-8665U @ 1.90GHz
8.8
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core i7-4940MX @ 3.10GHz
2,178
Intel Core i7-8665U @ 1.90GHz
2,163
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 i7-4940MX @ 3.10GHz Intel Core i7-8665U @ 1.90GHz
Max TDP57W15W
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.