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Radeon HD 7990 vs Radeon R9 290X

Intro

The Radeon HD 7990 comes with clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Compare those specifications to the Radeon R9 290X, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this specific model. It features 2816 SPUs as well as 176 TAUs and 64 Rasterization Operator Units.

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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 is 80% quicker than the Radeon R9 290X in general, due to its higher data rate. (explain)

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

Texel Rate

The Radeon HD 7990 is quite a bit (more or less 73%) more effective at AF 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 (more or less 19%) more effective at full screen anti-aliasing than the Radeon R9 290X, and should be able to handle higher resolutions without losing too much performance. (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

Radeon R9 290X

Specifications

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 information (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the 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 4 instead. The better 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Radeon HD 7990

Radeon R9 290X

Comments

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

hd 7990 radeon is the best card

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