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Radeon HD 7990 vs Radeon R9 290X

Intro

The Radeon HD 7990 comes with a GPU clock speed of 950 MHz, and the 3072 MB of GDDR5 RAM runs at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon R9 290X, which comes with a GPU core clock speed of 800 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 512-bit bus. It also is made up of 2816 SPUs, 176 TAUs, and 64 ROPs.

(No game benchmarks for this combination yet.)

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

Performance-wise, the Radeon HD 7990 should in theory be much better than the Radeon R9 290X in general. (explain)

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

Texel Rate

The Radeon HD 7990 will be quite a bit (approximately 73%) more effective at 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 should be just a bit (approximately 19%) more effective at full screen anti-aliasing than the Radeon R9 290X, and should be capable of handling higher resolutions more effectively. (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

Radeon HD 7990

Amazon.com

Radeon R9 290X

Amazon.com

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

Model Radeon HD 7990 Radeon R9 290X
Manufacturer AMD AMD
Year April 2013 October 2013
Code Name Malta Hawaii XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 3072 MB (x2) 4096 MB
Core Speed 950 MHz (x2) 800 MHz
Shader Speed N/A MHz (x2) (N/A) MHz
Memory Speed 1500 MHz (6000 MHz effective) (x2) 1250 MHz (5000 MHz effective)
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
DirectX Version DirectX 11.1 DirectX 11.2
OpenGL Version OpenGL 4.3 OpenGL 4.3
Power (Max TDP) 375 watts 300 watts
Shader Model 5.0 5.0
Bandwidth 576000 MB/sec 320000 MB/sec
Texel Rate 243200 Mtexels/sec 140800 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 51200 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the 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 amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

One Response to “Radeon HD 7990 vs Radeon R9 290X”
sam says:
hd 7990 radeon is the best card

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