Xeon L5638

Details and Benchmarks for Intel Xeon L5638

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 L5638 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,396 Rank: 1406
Rank Name Score Visual
1402 Core i7-940 4,400
+0.1%
1403 Intel Core i3-390M 4,399
+0.1%
1404 Core M-5Y10 4,399
+0.1%
1405 Core i5-650 4,399
+0.1%
1406 Xeon L5638 4,396
1407 Pentium G645 4,395
+-0%
1408 A8-6600K 4,394
+-0%
1409 Core i7-860 4,394
+-0%
1410 Athlon II X4 555 4,393
-0.1%
1411 A6-9500E 4,393
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Xeon L5638 based on multi-threaded benchmark results.

4,550 Rank: 1158
Rank Name Score Visual
1154 Xeon W3530 4,552
+0%
1155 Core i5-2560M 4,551
+0%
1156 Core i5-4300M 4,550
+0%
1157 Core i7-4550U 4,550
+0%
1158 Xeon L5638 4,550
1159 Xeon W3520 4,549
+-0%
1160 Core i7-6498DU 4,548
+-0%
1161 Intel Core i7-740QM 4,548
+-0%
1162 Core i7-4610M 4,548
+-0%
1163 Core i5-7Y57 4,547
-0.1%

View full ranking →

Singlecore Score

Single-core performance score for Xeon L5638 based on single-threaded benchmark results.

4,294 Rank: 1494
Rank Name Score Visual
1490 Core 2 Duo E7600 4,299
+0.1%
1491 Phenom II X3 B77 4,299
+0.1%
1492 Xeon E5630 4,297
+0.1%
1493 Core 2 Duo T9900 4,296
+0%
1494 Xeon L5638 4,294
1495 Athlon II X2 260 4,289
-0.1%
1496 Phenom II X4 850 4,288
-0.1%
1497 Core i3-4030U 4,288
-0.1%
1498 Core i3-540 4,288
-0.1%
1499 Xeon X5472 4,286
-0.2%

View full ranking →

Workload Scores

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

Number Crunching

Aggregated score for Xeon L5638 based on integer math, floating point math, and prime number computation benchmarks.

4,591 Rank: 985
Rank Name Score Visual
981 Xeon E5630 4,593
+0%
982 FX-4320 4,593
+0%
983 Core i5-2400 4,592
+0%
984 Core i7-920 4,592
+0%
985 Xeon L5638 4,591
986 Xeon E5620 4,590
+-0%
987 Pentium Gold G6400 4,590
+-0%
988 Core i3-1005G1 4,589
+-0%
989 Core i5-2320 4,589
+-0%
990 A12-9800 4,589
+-0%

View full ranking →

Data Processing

Aggregated score for Xeon L5638 based on data encryption, data compression, and string sorting benchmarks.

4,554 Rank: 1041
Rank Name Score Visual
1037 Core i5-6350HQ 4,555
+0%
1038 Core i3-7300T 4,555
+0%
1039 Core i5-2300 4,555
+0%
1040 Core i3-6098P 4,554
+0%
1041 Xeon L5638 4,554
1042 Pentium G4560 4,553
+-0%
1043 A10-7890K 4,553
+-0%
1044 Xeon E5530 4,553
+-0%
1045 Core i5-3335S 4,553
+-0%
1046 Athlon X4 950 4,553
+-0%

View full ranking →

Physics & Compute

Aggregated score for Xeon L5638 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,550 Rank: 1109
Rank Name Score Visual
1105 Core i7-3540M 4,550
+0%
1106 Athlon X4 880K 4,550
+0%
1107 Core i5-4210M 4,550
+0%
1108 Core i3-7100U 4,550
+0%
1109 Xeon L5638 4,550
1110 Core i3-2125 4,549
+-0%
1111 Xeon L5520 4,549
+-0%
1112 Pentium J6426 4,549
+-0%
1113 Pentium Gold G5420T 4,548
+-0%
1114 Core i5-3470T 4,548
+-0%

View full ranking →

Xeon L5638 Details

The Intel Xeon L5638, launched in March 2010, stands as a relic of the early 2010s server and workstation era, now more than 14 years old. While it was once a competitive option in its segment, its performance today places it far behind modern processors, with even recent mid-tier CPUs outpacing it in both single-core and multi-core tasks. Despite its age, the L5638 retains relevance for legacy systems, particularly in environments where ECC memory and multi-processor support are essential. It is built on Intel's Westmere-EP architecture, manufactured on a 32 nm process, and features a socket 1366 interface, which was standard for high-end Intel platforms at the time.

The processor is a six-core, twelve-thread design, leveraging Intel Hyper-Threading to double the effective thread count. It operates at a base frequency of 2.0 GHz, with a turbo boost up to 2.4 GHz, and includes 11.444 MiB of L3 cache, which was substantial for its time. The chip supports DDR3 memory across a triple-channel interface, enabling high bandwidth for server-grade applications, and it features a 60 W TDP, making it energy-efficient for its class. The Xeon L5638 supports up to two processors in a symmetric multiprocessing (SMP) configuration, enabling scalable performance for enterprise workloads.

In terms of integrated graphics, the Xeon L5638 lacks a GPU, requiring a discrete graphics card for any display output. However, it includes a comprehensive set of instruction set extensions, including SSE, AVX, AES-NI, and virtualization technologies such as VT-x and VT-d, making it well-suited for virtualized environments and data-intensive tasks. It also supports ECC memory, a critical feature for mission-critical systems where data integrity is paramount.

Benchmark data reveals the processor’s current standing. It achieves a single-core score of 4294, ranking #1494 out of 2060, and a multicore score of 4550, placing it #1156. The overall score of 4396 ranks it #1406 in the broader comparison. While it holds its own against a few older processors like the Core i7-860 and Athlon II X4 555, it trails significantly behind even mid-range modern CPUs. Its strongest performance category is multicore, where it outperforms several older dual- and quad-core processors, but it falls short in single-threaded tasks compared to contemporary offerings.

As of March 2026, the Xeon L5638 is best suited for legacy server environments, small-scale virtualization, or embedded applications where backward compatibility is more important than raw performance. While it lacks the power of today’s high-end processors—many of which achieve scores over 8,000 in multicore benchmarks—it remains a testament to Intel’s early efforts in delivering scalable, multi-threaded server solutions. For modern workloads, however, it is clearly outdated, and users should consider more recent alternatives for performance, efficiency, and feature support.
Frequently Compared

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Intel Xeon L5638

Main Specifications

Designer: Intel
Name: Xeon L5638
Cores: 6
Threads: 12
Base Frequency: 2000 MHz
Clock Multiplier: 15x (locked)
Core Name: Westmere-EP
Socket: Socket 1366
Package: FC-LGA10
Target Segment: Server
TDP: 60 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 EMMX SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 ABM BMI1 BMI2 FMA3 AES RdRand ADX CLMUL F16C x86-16 x86-32 x86-64 Real Protected SMM FPU NX HT TBT 2.0 EIST SST TXT vPro VT-x VT-d EPT AVX-512 AVX512F AVX512CD AVX512BW AVX512DQ AVX512VL TSX VMD NM KPT PTT MBE Ctrl DL Boost AVX512_VNNI
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