AMD Radeon RX 640 vs NVIDIA GeForce GTX 645

Compare AMD Radeon RX 640 4 GB vs NVIDIA GeForce GTX 645 1 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

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Specifications
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NVIDIA GeForce GTX 645

Price

The cheapest price from our partner retailers

$ 199.99

$ 108.02

$ 91.97 significantly less expensive

Benchmark Score

Overall Score

General gaming and workstation score

556 points

87% significantly better overall score

297 points

Flux Core frame rate

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

14 FPS

6 FPS significantly higher Flux Core frame rate

8 FPS

Electron frame rate

Randomly generated noise sphere test

9 FPS

5 FPS significantly higher Electron frame rate

4 FPS

City frame rate

Procedurally generated city scene with voxel rendering

13 FPS

9 FPS significantly higher City frame rate

4 FPS

Clouds frame rate

Real-time noise calculation and ray marching test

4 FPS

Identical

4 FPS

Free GPU Benchmark

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Other Benchmarks

Geekbench 5 (OpenCL) score

OpenCL compute benchmark

15883 points

204% significantly higher Geekbench 5 (OpenCL) score

5217 points

Geekbench 6 (OpenCL) score

OpenCL compute benchmark

14348 points

172% significantly higher Geekbench 6 (OpenCL) score

5274 points

Specifications

Memory

Onboard memory size for textures and vertices

4 GiB

300% significantly more memory

1 GiB

TDP

Thermal Design Power: Measure of heat generated by the GPU

50 W

28% slightly lower TDP

64 W

Other details

Rank

Ranking in the hardwareDB database

318th of 586

380th 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 645 benchmarks

In our benchmarks, the Radeon RX 640 beats the GeForce GTX 645 in gaming performance.

Furthermore, the spec sheet for both these GPUs show that the Radeon RX 640 has significantly more memory with 4 GiB of memory compared to 1 GiB. Memory size doesn't directly affect performance, but too little memory will certainly degrade gaming performance.

In addition, the Radeon RX 640 has a slightly lower TDP at 50 W when compared to the GeForce GTX 645 at 64 W. This is not a measure of performance, but rather the amount of heat generated by the chip when running at its highest speed.

In terms of raw gaming performance in our GPU benchmark, the Radeon RX 640 is better than the GeForce GTX 645.