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Radeon HD 7990 vs Radeon RX 480 4GB

Intro

The Radeon HD 7990 comes with a core clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 384-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Compare that to the Radeon RX 480 4GB, which features core clock speeds of 1120 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 2304 SPUs along with 144 Texture Address Units and 32 Rasterization Operator Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Radeon RX 480 4GB 25 Mh/s
Difference: 7 (28%)

Zcash Mining Hash Rate

Radeon HD 7990 513 Sol/s
Radeon RX 480 4GB 267 Sol/s
Difference: 246 (92%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 480 4GB 150 Watts
Radeon HD 7990 375 Watts
Difference: 225 Watts (150%)

Memory Bandwidth

The Radeon HD 7990 should in theory be quite a bit faster than the Radeon RX 480 4GB in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon RX 480 4GB 229376 MB/sec
Difference: 346624 (151%)

Texel Rate

The Radeon HD 7990 should be a lot (about 51%) better at AF than the Radeon RX 480 4GB. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon RX 480 4GB 161280 Mtexels/sec
Difference: 81920 (51%)

Pixel Rate

The Radeon HD 7990 should be a lot (approximately 70%) more effective at FSAA than the Radeon RX 480 4GB, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon RX 480 4GB 35840 Mpixels/sec
Difference: 24960 (70%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 7990

Amazon.com

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Radeon RX 480 4GB

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7990 Radeon RX 480 4GB
Manufacturer AMD AMD
Year April 2013 June 2016
Code Name Malta Polaris 10
Memory 3072 MB (x2) 4096 MB
Core Speed 950 MHz (x2) 1120 MHz
Memory Speed 6000 MHz (x2) 7000 MHz
Power (Max TDP) 375 watts 150 watts
Bandwidth 576000 MB/sec 229376 MB/sec
Texel Rate 243200 Mtexels/sec 161280 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 35840 Mpixels/sec
Unified Shaders 2048 (x2) 2304
Texture Mapping Units 128 (x2) 144
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit (x2) 256-bit
Fab Process 28 nm 14 nm
Transistors 4313 million 5700 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon RX 480 4GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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