AMD Radeon HD 7990 vs AMD Radeon RX 6400

Compare AMD Radeon HD 7990 3 GB vs AMD Radeon RX 6400 4 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

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AMD Radeon RX 6400

Price

The cheapest price from our partner retailers

$ 674.96

$ 130.03

$ 544.93 significantly less expensive

Benchmark Score

Overall Score

General gaming and workstation score

1743 points

1845 points

5% slightly better overall score

Flux Core frame rate

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

41 FPS

42 FPS

1 FPS slightly higher Flux Core frame rate

Electron frame rate

Randomly generated noise sphere test

25 FPS

28 FPS

3 FPS slightly higher Electron frame rate

City frame rate

Procedurally generated city scene with voxel rendering

35 FPS

36 FPS

1 FPS slightly higher City frame rate

Clouds frame rate

Real-time noise calculation and ray marching test

14 FPS

16 FPS

2 FPS slightly higher Clouds frame rate

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Specifications

Core Clock Speed

Nominal chip frequency

950 MHz

1923 MHz

102% significantly higher core clock speed

Boost Clock Speed

Higher turbo frequency when power conditions are met

1000 MHz

2321 MHz

132% significantly higher boost clock speed

Memory

Onboard memory size for textures and vertices

3 GiB

4 GiB

33% slightly more memory

Memory Bus Width

Number of parallel lines to the memory chips

384 Bit

499% significantly larger memory bus width

64 Bit

Memory Bandwidth

Data transfer speed between GPU core and memory

288 GB/s

125% significantly higher memory bandwidth

128 GB/s

TDP

Thermal Design Power: Measure of heat generated by the GPU

375 W

53 W

607% significantly lower TDP

Pixel Rate

Number of pixels that can be rendered per second

32 Gigapixels/s

74.3 Gigapixels/s

132% significantly higher pixel rate

Texture Rate

Number of textured pixels that can be rendered per second

128 Gigatexels/s

14% slightly higher texture rate

111.4 Gigatexels/s

Floating Point Performance

Raw number of floating point operations per second

4.10 TFLOPS

14% slightly better floating point performance

3.57 TFLOPS

Shading Units

Number of processors dedicated to shader processing

2048

166% significantly more shading units

768

Texture Mapping Units

Number of processors dedicated to applying textures

128

166% significantly more texture mapping units

Render Output Processors

Number of processors dedicated to final pixel rendering

Identical

Other details

Rank

Ranking in the hardwareDB database

223rd of 586

217th of 586

Family

The product line

Radeon HD 7000 Series

Radeon RX 6000 Series

Release date

The official date of release of this chip

2022 January

Memory Type

The type of memory used by this chip

GDDR5

GDDR6

DirectX Support

Maximum version of DirectX supported

11.2

12.0

OpenGL Support

Maximum version of OpenGL supported

4.4

4.6

Radeon HD 7990 vs Radeon RX 6400 comparison

In our benchmarks, the Radeon RX 6400 beats the Radeon HD 7990 in gaming performance.

The Radeon RX 6400 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 6400 also has a significantly higher boost clock speed: the maximum frequency the chip can reach if power delivery and thermals allow.

Next up, in terms of GPU memory, the Radeon RX 6400 has slightly more memory with 4 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 Radeon RX 6400 has a significantly lower TDP at 53 W when compared to the Radeon HD 7990 at 375 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 6400 is better than the Radeon HD 7990.