AMD Radeon RX 6900 XT vs AMD Radeon HD 7990

Compare AMD Radeon RX 6900 XT 16 GB vs AMD Radeon HD 7990 3 GB, specs and GPU benchmark score. Which is the better graphics card for the money?

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AMD Radeon HD 7990

Price

The cheapest price from our partner retailers

$ 629.99

$ 44.97 slightly less expensive

$ 674.96

Benchmark Score

Overall Score

General gaming and workstation score

14121 points

710% significantly better overall score

1743 points

Flux Core frame rate

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

286 FPS

245 FPS significantly higher Flux Core frame rate

41 FPS

Electron frame rate

Randomly generated noise sphere test

208 FPS

183 FPS significantly higher Electron frame rate

25 FPS

City frame rate

Procedurally generated city scene with voxel rendering

257 FPS

221 FPS significantly higher City frame rate

35 FPS

Clouds frame rate

Real-time noise calculation and ray marching test

122 FPS

109 FPS significantly higher Clouds frame rate

14 FPS

Free GPU Benchmark

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Specifications

Core Clock Speed

Nominal chip frequency

1825 MHz

92% significantly higher core clock speed

950 MHz

Boost Clock Speed

Higher turbo frequency when power conditions are met

2250 MHz

125% significantly higher boost clock speed

1000 MHz

Memory

Onboard memory size for textures and vertices

16 GiB

433% significantly more memory

3 GiB

Memory Bus Width

Number of parallel lines to the memory chips

256 Bit

384 Bit

49% significantly larger memory bus width

Memory Bandwidth

Data transfer speed between GPU core and memory

512 GB/s

77% significantly higher memory bandwidth

288 GB/s

TDP

Thermal Design Power: Measure of heat generated by the GPU

300 W

25% slightly lower TDP

375 W

Pixel Rate

Number of pixels that can be rendered per second

288 Gigapixels/s

800% significantly higher pixel rate

32 Gigapixels/s

Texture Rate

Number of textured pixels that can be rendered per second

720 Gigatexels/s

462% significantly higher texture rate

128 Gigatexels/s

Floating Point Performance

Raw number of floating point operations per second

23.04 TFLOPS

462% significantly better floating point performance

4.10 TFLOPS

Shading Units

Number of processors dedicated to shader processing

5120

150% significantly more shading units

2048

Texture Mapping Units

Number of processors dedicated to applying textures

320

150% significantly more texture mapping units

128

Render Output Processors

Number of processors dedicated to final pixel rendering

128

300% significantly more render output processors

Other details

Rank

Ranking in the hardwareDB database

24th of 586

223rd of 586

Family

The product line

Radeon RX 6000 Series

Radeon HD 7000 Series

Release date

The official date of release of this chip

2020 August

Memory Type

The type of memory used by this chip

GDDR6

GDDR5

DirectX Support

Maximum version of DirectX supported

12.0

11.2

OpenGL Support

Maximum version of OpenGL supported

4.6

4.4

Radeon RX 6900 XT vs Radeon HD 7990 specs and performance

For gaming, the Radeon RX 6900 XT graphics card is better than the Radeon HD 7990 in our tests.

The Radeon RX 6900 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 6900 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.

Furthermore, the spec sheet for both these GPUs show that the Radeon RX 6900 XT has significantly more memory with 16 GiB of memory compared to 3 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 6900 XT has a slightly lower TDP at 300 W when compared to the Radeon HD 7990 at 375 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 6900 XT is faster than the Radeon HD 7990.