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Radeon HD 7990 vs Radeon R9 290X


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

Compare all of that to the Radeon R9 290X, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this specific card. It features 2816 SPUs along with 176 TAUs and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 290X 300 Watts
Radeon HD 7990 375 Watts
Difference: 75 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be a lot faster than the Radeon R9 290X overall. (explain)

Radeon HD 7990 576000 MB/sec
Radeon R9 290X 320000 MB/sec
Difference: 256000 (80%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 73%) faster with regards to anisotropic filtering than the Radeon R9 290X. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon R9 290X 140800 Mtexels/sec
Difference: 102400 (73%)

Pixel Rate

The Radeon HD 7990 is a small bit (approximately 19%) better at FSAA than the Radeon R9 290X, and also should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon R9 290X 51200 Mpixels/sec
Difference: 9600 (19%)

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

Radeon R9 290X

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.


Display Specifications

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Model Radeon HD 7990 Radeon R9 290X
Manufacturer AMD AMD
Year April 2013 October 2013
Code Name Malta Hawaii XT
Memory 3072 MB (x2) 4096 MB
Core Speed 950 MHz (x2) 800 MHz
Memory Speed 6000 MHz (x2) 5000 MHz
Power (Max TDP) 375 watts 300 watts
Bandwidth 576000 MB/sec 320000 MB/sec
Texel Rate 243200 Mtexels/sec 140800 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 51200 Mpixels/sec
Unified Shaders 2048 (x2) 2816
Texture Mapping Units 128 (x2) 176
Render Output Units 32 (x2) 64
Bus Type GDDR5 GDDR5
Bus Width 384-bit (x2) 512-bit
Fab Process 28 nm 28 nm
Transistors 4313 million 6200 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.


One Response to “Radeon HD 7990 vs Radeon R9 290X”
sam says:

hd 7990 radeon is the best card

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