Xeon E5645

Details and Benchmarks for Intel Xeon E5645

Sysbuilds Alpha Stage!

Please take all results with a big grain of salt. Sysbuilds is in alpha stage at the moment which can lead to wrong data, strange counting errors, silly results and more. This site is under active development.

Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Xeon E5645 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,468 Rank: 1318
Rank Name Score Visual
1314 Xeon X5550 4,474
+0.1%
1315 Core i5-750 4,473
+0.1%
1316 Core i5-680 4,473
+0.1%
1317 Core i7-965 4,472
+0.1%
1318 Xeon E5645 4,468
1319 Xeon E5-2430 v2 4,467
+-0%
1320 Core i7-960 4,467
+-0%
1321 Xeon E5-2609 v4 4,465
-0.1%
1322 Phenom II X6 1055T 4,462
-0.1%
1323 A10 PRO-7850B 4,461
-0.2%

View full ranking →

Multicore Score

Multicore performance score for Xeon E5645 based on multi-threaded benchmark results.

4,613 Rank: 1070
Rank Name Score Visual
1066 Core i5-2500 4,615
+0%
1067 Pentium G4620 4,614
+0%
1068 FX-6120 4,613
+0%
1069 Phenom II X6 1075T 4,613
+0%
1070 Xeon E5645 4,613
1071 Core i3-2377M 4,612
+-0%
1072 Core i3-4330 4,612
+-0%
1073 FX-8320E 4,612
+-0%
1074 Core 2 Duo T7250 4,611
+-0%
1075 Xeon E3-1260L 4,611
+-0%

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Singlecore Score

Single-core performance score for Xeon E5645 based on single-threaded benchmark results.

4,372 Rank: 1418
Rank Name Score Visual
1414 Celeron G1610 4,376
+0.1%
1415 Pentium N6415 4,376
+0.1%
1416 A8 PRO-7600B 4,376
+0.1%
1417 Core i5-650 4,374
+0%
1418 Xeon E5645 4,372
1419 Core M 5Y70 4,370
+-0%
1420 A6-7400K 4,369
-0.1%
1421 Phenom 9650 4,369
-0.1%
1422 Xeon E5450 4,367
-0.1%
1423 A9-9400 4,366
-0.1%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Xeon E5645 based on integer math, floating point math, and prime number computation benchmarks.

4,635 Rank: 874
Rank Name Score Visual
870 Xeon E3-1280 4,637
+0%
871 Core i3-9100T 4,636
+0%
872 Core i7-4702HQ 4,636
+0%
873 Core i5-3570S 4,636
+0%
874 Xeon E5645 4,635
875 Xeon Bronze 3104 4,634
+-0%
876 Core i5-7400 4,634
+-0%
877 Core i7-2600K 4,634
+-0%
878 Core i3-1115G4 4,634
+-0%
879 Core i5-4440 4,632
-0.1%

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Data Processing

Aggregated score for Xeon E5645 based on data encryption, data compression, and string sorting benchmarks.

4,631 Rank: 824
Rank Name Score Visual
820 Core i5-6600K 4,632
+0%
821 Core i7-4710HQ 4,632
+0%
822 Core i7-6700TE 4,631
+0%
823 Core i7-3615QM 4,631
+0%
824 Xeon E5645 4,631
825 Xeon D-1521 4,630
+-0%
826 Core i5-8350U 4,630
+-0%
827 Core i5-10210U 4,630
+-0%
828 Core i7-4750HQ 4,630
+-0%
829 Core i7-3610QM 4,630
+-0%

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Physics & Compute

Aggregated score for Xeon E5645 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,604 Rank: 954
Rank Name Score Visual
950 Xeon W3580 4,607
+0.1%
951 Core i7-2860QM 4,606
+0%
952 Core i5-3475S 4,605
+0%
953 Core i3-8121U 4,604
+0%
954 Xeon E5645 4,604
955 Atom C3858 4,603
+-0%
956 Core i5-3340 4,603
+-0%
957 Core i5-3330S 4,603
+-0%
958 Core i7-2920XM 4,603
+-0%
959 Core i7-975 4,603
+-0%

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Xeon E5645 Details

Ranked #1318 of 2060 in overall performance, the Intel Xeon E5645 presents a compelling case for its era, though it now stands as a relic of early 2010s server computing. Launched in March 2010, this processor is built on Intel's 32 nm Westmere-EP architecture, a refined evolution of the Nehalem design, and was positioned as a high-performance solution for server and workstation environments. With a base clock of 2.4 GHz and a turbo frequency reaching 2.666 GHz, the E5645 delivers robust single-threaded performance, as evidenced by its single-core score of 4372, placing it in the middle tier of its time. Its 6-core, 12-thread configuration—enabled by Intel Hyper-Threading—allowed it to scale well in multi-threaded workloads, achieving a multicore score of 4613, which reflects its capability in parallel processing tasks.

The Xeon E5645 operates on a Socket 1366 platform and supports DDR3 memory via a triple-channel interface, a significant advantage for memory bandwidth-heavy applications. Its 11.444 MiB of L3 cache, combined with 0.061 MiB of L1 and 0.244 MiB of L2 cache, ensures efficient data access, particularly in server workloads that rely on large datasets. Despite lacking integrated graphics, the processor supports advanced features such as ECC memory, VT-x virtualization, and Intel's Enhanced SpeedStep Technology, making it a reliable choice for mission-critical systems. Its 80 W TDP indicates moderate power consumption, requiring adequate cooling, especially in multi-processor configurations.

In today's context, the E5645 is far from competitive with modern processors. The top-ranked CPU, the Ryzen Threadripper PRO 9995WX, scores over twice as high in overall performance, underscoring the leaps in technology over the past decade. However, within its own generation, the E5645 held its own, competing closely with other Xeons like the Xeon X5550 and Core i7-965. Its multicore performance, while modest by today's standards, was impressive for its time, particularly in server environments where multi-threaded efficiency was paramount. The processor’s strength lies in its balanced design, combining solid single-core performance with capable multi-threading, making it suitable for virtualization, database management, and other enterprise workloads.

As of March 2026, the Xeon E5645 is best suited for legacy systems, retro computing projects, or educational purposes where understanding historical hardware is valuable. While it cannot keep pace with modern high-end CPUs, its design principles—such as integrated ECC support and multi-processor scalability—remain influential in server architecture. For users seeking a reliable, cost-effective solution for low-demand server tasks or learning about early 2010s server technology, the E5645 remains a noteworthy, if outdated, option.
Frequently Compared

AMD Ryzen Threadripper 1950X 26 views

AMD Phenom II X3 710 24 views

Intel Xeon D-1557 24 views

AMD Ryzen 5 3600 23 views

AMD Phenom 9650 23 views

AMD Ryzen Threadripper 2990WX 22 views

Intel Celeron G530 21 views

AMD A10-7400P 20 views

AMD Ryzen 9 PRO 3900 17 views

AMD Ryzen 5 3500X 16 views

Intel Xeon E5645

Main Specifications

Designer: Intel
Name: Xeon E5645
Cores: 6
Threads: 12
Base Frequency: 2400 MHz
Clock Multiplier: 18x (locked)
Core Name: Westmere-EP
Socket: Socket 1366
Package: FC-LGA10
Target Segment: Server
TDP: 80 W

Cache Specifications

L1 Cache: 62.464 KiB
L2 Cache: 0.244 MiB
L3 Cache: 11.444 MiB

Memory Specifications

Supported Memory Type: DDR3

Physical Specifications

Process: 32 nm
Die Area: 239 mm²
Manufacturer: Intel

CPU Features

MMX SSE SSE2 SSE3 SSSE3 SSE4.2 EIST TXT VT-x
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