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Intel Xeon E3-1275 vs Xeon E5649

The Intel Xeon E5649 @ 2.53GHz is newer than Intel Xeon E3-1275 @ 3.40GHz, while the multi-threaded (CPU Mark) is simliar, Intel Xeon E3-1275 @ 3.40GHz is around 26% faster in single-thread testing. However, 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 177 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 E3-1275 @ 3.40GHz×Intel Xeon E5649 @ 2.53GHz+ ADD
Price $160 - BUY Search Online
Socket TypeLGA1155LGA1366
CPU ClassServerServer
Clockspeed3.4 GHz2.5 GHz
Turbo SpeedUp to 3.8 GHzUp to 2.9 GHz
# of Physical Cores4 (Threads: 8)6 (Threads: 12)
CacheL1: 256KB, L2: 1.0MB, L3: 8MBL1: 384KB, L2: 1.5MB, L3: 12MB
TDP95W80W
Yearly Running Cost$17.34$14.60
Other
First Seen on ChartQ2 2011Q3 2011
# of Samples13344
CPU Value34.443.5
Single Thread Rating(% diff. to max in group)1780(0.0%)1316(-26.1%)
CPU Mark(% diff. to max in group)5500(-2.8%)5659(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 12th of March 2025 - Higher results represent better performance
Intel Xeon E3-1275 @ 3.40GHz
5,500
Intel Xeon E5649 @ 2.53GHz
5,659
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 12th of March 2025 - Higher results represent better value
Intel Xeon E3-1275 @ 3.40GHz
34.4
Intel Xeon E5649 @ 2.53GHz
43.5
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 12th of March 2025 - Higher results represent better performance
Intel Xeon E3-1275 @ 3.40GHz
1,780
Intel Xeon E5649 @ 2.53GHz
1,316
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 Xeon E3-1275 @ 3.40GHz Intel Xeon E5649 @ 2.53GHz
Max TDP95W80W
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.