AMD Radeon RX 6600 XT vs NVIDIA GeForce GTX 660

Compare AMD Radeon RX 6600 XT 8 GB vs NVIDIA GeForce GTX 660 3 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

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Benchmark Score

Overall Score

General gaming and workstation score

5600 points

586% significantly better overall score

816 points

Flux Core frame rate

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

116 FPS

97 FPS significantly higher Flux Core frame rate

18 FPS

Electron frame rate

Randomly generated noise sphere test

85 FPS

74 FPS significantly higher Electron frame rate

11 FPS

City frame rate

Procedurally generated city scene with voxel rendering

102 FPS

89 FPS significantly higher City frame rate

13 FPS

Clouds frame rate

Real-time noise calculation and ray marching test

49 FPS

40 FPS significantly higher Clouds frame rate

9 FPS

Free GPU Benchmark

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Other Benchmarks

3DMark Graphics score

High-end graphics benchmark

9727 points

638% significantly higher 3DMark Graphics score

1317 points

Blender score

Cycles Render (Samples per minute)

1068.60 points

771% significantly higher Blender score

122.56 points

Geekbench 5 (Metal) score

Metal compute benchmark

83409 points

1430% significantly higher Geekbench 5 (Metal) score

5449 points

Geekbench 5 (OpenCL) score

OpenCL compute benchmark

82559 points

625% significantly higher Geekbench 5 (OpenCL) score

11381 points

Geekbench 5 (Vulkan) score

Vulkan compute benchmark

64460 points

502% significantly higher Geekbench 5 (Vulkan) score

10693 points

Geekbench 6 (Metal) score

Metal compute benchmark

109165 points

2432% significantly higher Geekbench 6 (Metal) score

4311 points

Geekbench 6 (OpenCL) score

OpenCL compute benchmark

82739 points

628% significantly higher Geekbench 6 (OpenCL) score

11353 points

Geekbench 6 (Vulkan) score

Vulkan compute benchmark

93271 points

686% significantly higher Geekbench 6 (Vulkan) score

11858 points

Specifications

Core Clock Speed

Nominal chip frequency

1968 MHz

100% significantly higher core clock speed

980 MHz

Boost Clock Speed

Higher turbo frequency when power conditions are met

2589 MHz

150% significantly higher boost clock speed

1032 MHz

Memory

Onboard memory size for textures and vertices

8 GiB

166% significantly more memory

3 GiB

Memory Bus Width

Number of parallel lines to the memory chips

128 Bit

192 Bit

49% significantly larger memory bus width

Memory Bandwidth

Data transfer speed between GPU core and memory

256 GB/s

77% significantly higher memory bandwidth

144.2 GB/s

TDP

Thermal Design Power: Measure of heat generated by the GPU

160 W

140 W

14% slightly lower TDP

Pixel Rate

Number of pixels that can be rendered per second

165.7 Gigapixels/s

702% significantly higher pixel rate

20.64 Gigapixels/s

Texture Rate

Number of textured pixels that can be rendered per second

331.4 Gigatexels/s

301% significantly higher texture rate

82.56 Gigatexels/s

Floating Point Performance

Raw number of floating point operations per second

10.6 TFLOPS

435% significantly better floating point performance

1.98 TFLOPS

Shading Units

Number of processors dedicated to shader processing

2048

113% significantly more shading units

960

Texture Mapping Units

Number of processors dedicated to applying textures

128

60% significantly more texture mapping units

Render Output Processors

Number of processors dedicated to final pixel rendering

166% significantly more render output processors

Other details

Rank

Ranking in the hardwareDB database

90th of 586

276th of 586

Family

The product line

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

GDDR6

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 6600 XT vs GeForce GTX 660 comparison

In our benchmarks, the Radeon RX 6600 XT beats the GeForce GTX 660 in gaming performance.

Our database shows that the Radeon RX 6600 XT has a significantly higher core clock speed. The core clock speed (or base speed) is the frequency at which the GPU core runs. This metric makes sense when comparing GPUs of a similar architecture or generation. In addition, the Radeon RX 6600 XT also has a significantly higher boost clock speed. This is a frequency that can be reached if the GPU is cooled sufficiently and has enough power.

As stated by the manufacturer, the Radeon RX 6600 XT has significantly more memory with 8 GiB of memory compared to 3 GiB. Memory size doesn't directly affect performance, but too little memory will certainly degrade gaming performance.

In addition, the GeForce GTX 660 has a slightly lower TDP at 140 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.

In terms of raw gaming performance in our GPU benchmark, the Radeon RX 6600 XT is better than the GeForce GTX 660.