AMD Radeon RX 640 vs AMD Radeon RX 6600 XT

Compare AMD Radeon RX 640 4 GB vs AMD Radeon RX 6600 XT 8 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

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Specifications
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AMD Radeon RX 6600 XT

Price

The cheapest price from our partner retailers

$ 199.99

$ 170.00 significantly less expensive

$ 369.99

Benchmark Score

Overall Score

General gaming and workstation score

556 points

5600 points

907% significantly better overall score

Flux Core frame rate

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

14 FPS

116 FPS

102 FPS significantly higher Flux Core frame rate

Electron frame rate

Randomly generated noise sphere test

9 FPS

85 FPS

76 FPS significantly higher Electron frame rate

City frame rate

Procedurally generated city scene with voxel rendering

13 FPS

102 FPS

89 FPS significantly higher City frame rate

Clouds frame rate

Real-time noise calculation and ray marching test

4 FPS

49 FPS

45 FPS significantly higher Clouds frame rate

Free GPU Benchmark

Want to compare your graphics card against the Radeon RX 640 and the Radeon RX 6600 XT? Download our free and quick PC Performance Test.

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Other Benchmarks

Geekbench 5 (OpenCL) score

OpenCL compute benchmark

15883 points

82559 points

419% significantly higher Geekbench 5 (OpenCL) score

Geekbench 5 (Vulkan) score

Vulkan compute benchmark

15859 points

64460 points

306% significantly higher Geekbench 5 (Vulkan) score

Geekbench 6 (OpenCL) score

OpenCL compute benchmark

14348 points

82739 points

476% significantly higher Geekbench 6 (OpenCL) score

Geekbench 6 (Vulkan) score

Vulkan compute benchmark

16397 points

93271 points

468% significantly higher Geekbench 6 (Vulkan) score

Specifications

Core Clock Speed

Nominal chip frequency

1082 MHz

1968 MHz

81% significantly higher core clock speed

Boost Clock Speed

Higher turbo frequency when power conditions are met

1287 MHz

2589 MHz

101% significantly higher boost clock speed

Memory

Onboard memory size for textures and vertices

4 GiB

8 GiB

100% significantly more memory

Memory Bus Width

Number of parallel lines to the memory chips

64 Bit

128 Bit

100% significantly larger memory bus width

Memory Bandwidth

Data transfer speed between GPU core and memory

56 GB/s

256 GB/s

357% significantly higher memory bandwidth

TDP

Thermal Design Power: Measure of heat generated by the GPU

50 W

220% significantly lower TDP

160 W

Pixel Rate

Number of pixels that can be rendered per second

20.6 Gigapixels/s

165.7 Gigapixels/s

704% significantly higher pixel rate

Texture Rate

Number of textured pixels that can be rendered per second

51.48 Gigatexels/s

331.4 Gigatexels/s

543% significantly higher texture rate

Texture Mapping Units

Number of processors dedicated to applying textures

128

220% significantly more texture mapping units

Render Output Processors

Number of processors dedicated to final pixel rendering

300% significantly more render output processors

Other details

Rank

Ranking in the hardwareDB database

318th of 586

90th of 586

Family

The product line

Radeon 600 Series

Radeon RX 6000 Series

Release date

The official date of release of this chip

2021 November

Memory Type

The type of memory used by this chip

GDDR5

GDDR6

DirectX Support

Maximum version of DirectX supported

12.0

OpenGL Support

Maximum version of OpenGL supported

4.6

Radeon RX 640 vs Radeon RX 6600 XT benchmarks

For gaming, the Radeon RX 6600 XT graphics card is better than the Radeon RX 640 in our tests.

In our comparison, the Radeon RX 6600 XT has a significantly 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 6600 XT also has a significantly 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 6600 XT has significantly more memory with 8 GiB of memory compared to 4 GiB. If you're planning at playing games at high resolutions with high-quality textures, you will need a lot of memory.

In addition, the Radeon RX 640 has a significantly lower TDP at 50 W when compared to the Radeon RX 6600 XT at 160 W. Heat output doesn't match power consumption directly but, it's a good estimate.

According to the results of the hardwareDB benchmark utility, the Radeon RX 6600 XT is faster than the Radeon RX 640.