Radeon HD 7990 vs Radeon R9 M295X

Intro

Compare that to the Radeon R9 M295X, which features GPU clock speed of 750 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 7990		375 Watts
	Difference: 250 Watts (200%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be a lot superior to the Radeon R9 M295X in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 400000 (227%)

Texel Rate

The Radeon HD 7990 should be quite a bit (more or less 153%) more effective at AF than the Radeon R9 M295X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 147200 (153%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is superior to the Radeon R9 M295X, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 36800 (153%)

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

Specifications

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

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one 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 outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.