Core i5 661

Details and Benchmarks for Intel Core i5 661

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 Core i5 661 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

-- Rank: --

Overall score not yet available. Both single-core and multi-core scores are required.

View full ranking →

Multicore Score

Multicore performance score for Core i5 661 based on multi-threaded benchmark results.

4,463 Rank: 1298
Rank Name Score Visual
1294 Celeron G3930TE 4,464
+0%
1295 Athlon II X4 645 4,464
+0%
1296 Phenom II X4 925 4,463
+0%
1297 Phenom 9550 4,463
+0%
1298 Xeon X5450 4,462
+-0%
1299 A8-7670K 4,461
+-0%
1300 FX-4100 4,461
+-0%
1301 Core i7-860 4,461
+-0%
1302 Pentium G3460 4,459
-0.1%
1303 FX-6100 4,459
-0.1%

View full ranking →

Singlecore Score

Single-core performance score for Core i5 661 based on single-threaded benchmark results.

-- Rank: --

Singlecore score not yet available.

View full ranking →

Workload Scores

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

Number Crunching

Aggregated score for Core i5 661 based on integer math, floating point math, and prime number computation benchmarks.

-- Rank: --

Number Crunching score not yet available.

View full ranking →

Data Processing

Aggregated score for Core i5 661 based on data encryption, data compression, and string sorting benchmarks.

-- Rank: --

Data Processing score not yet available.

View full ranking →

Physics & Compute

Aggregated score for Core i5 661 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

-- Rank: --

Physics & Compute score not yet available.

View full ranking →

Core i5 661 Details

The Core i5-661, released by Intel in the early 2010s, is a dual-core processor built on a 32 nm process and designed for mainstream desktop use. Despite its age—now over a decade old—it remains notable for its Hyper-Threading support, which allows it to handle four threads simultaneously, a feature that was relatively advanced for its time. The processor operates at a base frequency of 3.33 GHz, with a turbo boost up to 3.6 GHz, and is built on the Sandy Bridge microarchitecture. It is compatible with the FCLGA1156 socket, making it one of the last mainstream Intel CPUs to use this interface before the transition to LGA1155 and later sockets. With a TDP of 87 W, it demands robust cooling solutions and reflects the power-hungry design philosophy of early 2010s desktop processors.

The Core i5-661 supports up to 16 GB of DDR3 1066/1333 memory across two channels, delivering a maximum memory bandwidth of 21 GB/s. It features a 4 MB L3 cache and integrates Intel HD Graphics, which runs at a base frequency of 900 MHz and can boost to 1.1 GHz under load. This integrated GPU supports up to two displays and is capable of handling basic multimedia tasks and light gaming, though it is no longer suitable for modern graphical workloads. The processor also supports a range of advanced features, including AES-NI for encryption, AVX2 for vectorized operations, and VT-x/VT-d for virtualization, making it versatile for both productivity and software development environments.

In terms of performance, the Core i5-661 achieves a multicore score of 4463, placing it at rank #1296 out of 2060 in the overall benchmark database. This score is comparable to several modern low-end CPUs, such as the Athlon 200GE and Celeron G3930TE, which suggests that while the processor is outdated, it still holds its own in basic multi-threaded tasks. However, its single-core performance is notably weaker, placing it far behind contemporary processors. For instance, it lags behind high-end CPUs like the Core Ultra 9 285K and Ryzen 9 9950X3D, which score over 8,000 in single-core tests. This indicates that the i5-661 is more suited for applications that leverage multiple cores rather than single-threaded performance.

When compared to its immediate peers, the Core i5-661 is outperformed by modern quad-core and higher processors, even in budget segments. It ranks just ahead of older Xeon and FX processors, such as the Xeon X5450 and FX-4100, but falls behind most current-generation CPUs. As of March 2026, the processor is best suited for legacy systems, basic office use, or as a replacement in older machines where upgrading the entire platform is not feasible. While it lacks the performance and efficiency of modern processors, its integrated graphics and Hyper-Threading support make it a viable option for light computing tasks in non-demanding environments.

Intel Core i5 661

Main Specifications

Designer: Intel
Name: Core i5 661
Model Number: i5-661
Cores: 2
Threads: 4
Base Frequency: 3330 MHz
Socket: FCLGA1156
Max CPUs: 1
TDP: 87 W

Cache Specifications

Memory Specifications

Supported Memory Type: DDR3 1066/1333
Memory Channels: 2
Maximum Memory: 0 GB
Maximum Bandwidth: 21 GB/s
ECC Support: No

PCI-Express Specifications

PCIe Revision: 2.0
PCIe Lanes: 16
PCIe Configuration: 1x16, 2x8

Integrated Graphics

GPU: HD Graphics
GPU Designer: Intel
GPU Max Frequency: 1100 MHz

Physical Specifications

Process: 32 nm
Word Size: 64-bit

CPU Features

SSE4.1 SSE4.2 AVX2 AES x86-64 HT EIST TXT vPro VT-x VT-d EPT Secure Key SMEP SIPP IPT TSX Flex Memory FMA

Login

Forgot your password?

Your experience on this site will be improved by allowing cookies.