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Radeon HD 4790 vs Radeon HD 7990

Intro

The Radeon HD 4790 comes with clock speeds of 600 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 7990, which comes with GPU core speed of 950 MHz, and 3072 MB of GDDR5 RAM running at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 is 463% faster than the Radeon HD 4790 overall, due to its greater bandwidth. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 473600 (463%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 1167%) more effective at AF than the Radeon HD 4790. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 224000 (1167%)

Pixel Rate

The Radeon HD 7990 is quite a bit (approximately 533%) faster with regards to FSAA than the Radeon HD 4790, and will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 51200 (533%)

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 4790

Amazon.com

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Radeon HD 7990

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.

Specifications

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Model Radeon HD 4790 Radeon HD 7990
Manufacturer AMD AMD
Year 2009 April 2013
Code Name RV790 Malta
Memory 512 MB 3072 MB (x2)
Core Speed 600 MHz 950 MHz (x2)
Memory Speed 3200 MHz 6000 MHz (x2)
Power (Max TDP) (Unknown) watts 375 watts
Bandwidth 102400 MB/sec 576000 MB/sec
Texel Rate 19200 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 640(128x5) 2048 (x2)
Texture Mapping Units 32 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit (x2)
Fab Process 55 nm 28 nm
Transistors 959 million 4313 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4790

Amazon.com

Check prices at:

Radeon HD 7990

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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