AMD Radeon RX 640 vs NVIDIA GeForce GTX 660

Compare AMD Radeon RX 640 4 GB vs NVIDIA GeForce GTX 660 3 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

Benchmark Score
Other Benchmarks
Specifications
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Benchmark Score

Overall Score

General gaming and workstation score

556 points

816 points

46% significantly better overall score

Flux Core frame rate

Volumetric ray casting test, a computationally expensive method of rendering high-quality scenes

14 FPS

18 FPS

5 FPS significantly higher Flux Core frame rate

Electron frame rate

Randomly generated noise sphere test

9 FPS

11 FPS

2 FPS slightly higher Electron frame rate

City frame rate

Procedurally generated city scene with voxel rendering

13 FPS

Identical

13 FPS

Clouds frame rate

Real-time noise calculation and ray marching test

4 FPS

9 FPS

5 FPS significantly higher Clouds frame rate

Free GPU Benchmark

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Other Benchmarks

Geekbench 5 (OpenCL) score

OpenCL compute benchmark

15883 points

39% slightly higher Geekbench 5 (OpenCL) score

11381 points

Geekbench 5 (Vulkan) score

Vulkan compute benchmark

15859 points

48% significantly higher Geekbench 5 (Vulkan) score

10693 points

Geekbench 6 (OpenCL) score

OpenCL compute benchmark

14348 points

26% slightly higher Geekbench 6 (OpenCL) score

11353 points

Geekbench 6 (Vulkan) score

Vulkan compute benchmark

16397 points

38% slightly higher Geekbench 6 (Vulkan) score

11858 points

Specifications

Core Clock Speed

Nominal chip frequency

1082 MHz

10% slightly higher core clock speed

980 MHz

Boost Clock Speed

Higher turbo frequency when power conditions are met

1287 MHz

24% slightly higher boost clock speed

1032 MHz

Memory

Onboard memory size for textures and vertices

4 GiB

33% slightly more memory

3 GiB

Memory Bus Width

Number of parallel lines to the memory chips

64 Bit

192 Bit

200% significantly larger memory bus width

Memory Bandwidth

Data transfer speed between GPU core and memory

56 GB/s

144.2 GB/s

157% significantly higher memory bandwidth

TDP

Thermal Design Power: Measure of heat generated by the GPU

50 W

180% significantly lower TDP

140 W

Pixel Rate

Number of pixels that can be rendered per second

20.6 Gigapixels/s

20.64 Gigapixels/s

0.19% slightly higher pixel rate

Texture Rate

Number of textured pixels that can be rendered per second

51.48 Gigatexels/s

82.56 Gigatexels/s

60% significantly higher texture rate

Texture Mapping Units

Number of processors dedicated to applying textures

100% significantly more texture mapping units

Render Output Processors

Number of processors dedicated to final pixel rendering

49% significantly more render output processors

Other details

Rank

Ranking in the hardwareDB database

318th of 586

277th of 586

Family

The product line

Radeon 600 Series

Memory Type

The type of memory used by this chip

GDDR5

DirectX Support

Maximum version of DirectX supported

12.0

11.0

OpenGL Support

Maximum version of OpenGL supported

4.6

4.5

Radeon RX 640 vs GeForce GTX 660 specs and performance

In our benchmarks, the GeForce GTX 660 beats the Radeon RX 640 in gaming performance.

In our comparison, the Radeon RX 640 has a slightly higher core clock speed. This is the frequency at which the graphics core is running at. While not necessarily an indicator of overall performance, this metric can be useful when comparing two GPUs based on the same architecture. In addition, the Radeon RX 640 also has a slightly higher boost clock speed. The boost clock speed is the frequency that the GPU core can reach if the temperature is low enough. The allows for higher performance in certain scenarios.

Furthermore, the spec sheet for both these GPUs show that the Radeon RX 640 has slightly more memory with 4 GiB of memory compared to 3 GiB. Lots of memory is good when playing at high resolutions or with many monitors.

In addition, the Radeon RX 640 has a significantly lower TDP at 50 W when compared to the GeForce GTX 660 at 140 W. This is not a measure of performance, but rather the amount of heat generated by the chip when running at its highest speed.

According to the results of the hardwareDB benchmark utility, the GeForce GTX 660 is faster than the Radeon RX 640.