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Intel Xeon E5645 vs Xeon E3-1275

The Intel Xeon E3-1275 @ 3.40GHz is newer than Intel Xeon E5645 @ 2.40GHz and is around 11% faster in multi-threaded (CPU Mark) testing. It is also significantly faster in single-thread testing. Also, Intel Xeon E3-1275 @ 3.40GHz uses around 17% more power. All the CPUs in this comparison belong in the Server CPU Class. The values below were tabulated from a combined 255 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 E5645 @ 2.40GHz×Intel Xeon E3-1275 @ 3.40GHz+ ADD
Price Search Online Search Online
Socket TypeLGA1366LGA1155
CPU ClassServerServer
Clockspeed2.4 GHz3.4 GHz
Turbo SpeedUp to 2.7 GHzUp to 3.8 GHz
# of Physical Cores6 (Threads: 12)4 (Threads: 8)
CacheL1: 384KB, L2: 1.5MB, L3: 12MBL1: 256KB, L2: 1.0MB, L3: 8MB
TDP80W95W
Yearly Running Cost$14.60$17.34
Other
First Seen on ChartQ2 2011Q2 2011
# of Samples112143
CPU Rank24182286
CPU Value35.934.3
Single Thread Rating(% diff. to max in group)1131(-36.2%)1774(0.0%)
CPU Mark(% diff. to max in group)4921(-10.3%)5487(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 16th of March 2026 - Higher results represent better performance
Intel Xeon E5645 @ 2.40GHz
4,921
Intel Xeon E3-1275 @ 3.40GHz
5,487
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 16th of March 2026 - Higher results represent better value
Intel Xeon E5645 @ 2.40GHz
35.9
Intel Xeon E3-1275 @ 3.40GHz
34.3
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 16th of March 2026 - Higher results represent better performance
Intel Xeon E5645 @ 2.40GHz
1,131
Intel Xeon E3-1275 @ 3.40GHz
1,774
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 E5645 @ 2.40GHz Intel Xeon E3-1275 @ 3.40GHz
Max TDP80W95W
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.