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Intel Xeon E5540 vs Xeon E5645

The Intel Xeon E5645 @ 2.40GHz is newer than Intel Xeon E5540 @ 2.53GHz and is significantly faster in multi-threaded (CPU Mark) testing. The Intel Xeon E5645 @ 2.40GHz is around -6% slower in single-thread testing. Both CPUs operates at simliar power levels (TDP). All the CPUs in this comparison belong in the Server CPU Class. The values below were tabulated from a combined 162 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 Xeon E5540 @ 2.53GHz×Intel Xeon E5645 @ 2.40GHz+ ADD
Price Search Online Search Online
Socket TypeLGA1366LGA1366
CPU ClassServerServer
Clockspeed2.5 GHz2.4 GHz
Turbo SpeedUp to 2.8 GHzUp to 2.7 GHz
# of Physical Cores4 (Threads: 8)6 (Threads: 12)
CacheL1: 256KB, L2: 1.0MB, L3: 8MBL1: 384KB, L2: 1.5MB, L3: 12MB
TDP80W80W
Yearly Running Cost$14.60$14.60
Other
First Seen on ChartQ3 2009Q2 2011
# of Samples50112
CPU Rank31292417
CPU Value31.535.9
Single Thread Rating(% diff. to max in group)1200(0.0%)1131(-5.8%)
CPU Mark(% diff. to max in group)2805(-43.0%)4921(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 14th of March 2026 - Higher results represent better performance
Intel Xeon E5540 @ 2.53GHz
2,805
Intel Xeon E5645 @ 2.40GHz
4,921
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 14th of March 2026 - Higher results represent better value
Intel Xeon E5540 @ 2.53GHz
31.5
Intel Xeon E5645 @ 2.40GHz
35.9
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 14th of March 2026 - Higher results represent better performance
Intel Xeon E5540 @ 2.53GHz
1,200
Intel Xeon E5645 @ 2.40GHz
1,131
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 Xeon E5540 @ 2.53GHz Intel Xeon E5645 @ 2.40GHz
Max TDP80W80W
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.