Radeon HD 7790 vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which comes with a core clock speed of 750 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon R9 M295X		125 Watts
	Difference: 40 Watts (47%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M295X should in theory be quite a bit superior to the Radeon HD 7790 overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 80000 (83%)

Texel Rate

The Radeon R9 M295X is quite a bit (about 71%) better at anisotropic filtering than the Radeon HD 7790. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 40000 (71%)

Pixel Rate

The Radeon R9 M295X should be quite a bit (approximately 50%) more effective at anti-aliasing than the Radeon HD 7790, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 8000 (50%)

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.

Price Comparison

Specifications

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure 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 rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.