Geforce GTX 680 vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which features GPU core speed of 750 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Geforce GTX 680		195 Watts
	Difference: 70 Watts (56%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be a bit faster than the Radeon R9 M295X in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M295X		176000 MB/sec
	Difference: 16256 (9%)

Texel Rate

The Geforce GTX 680 will be much (more or less 34%) faster with regards to anisotropic filtering than the Radeon R9 M295X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M295X		96000 Mtexels/sec
	Difference: 32768 (34%)

Pixel Rate

The Geforce GTX 680 will be a lot (more or less 34%) faster with regards to anti-aliasing than the Radeon R9 M295X, and will be capable of handling higher resolutions while still performing well. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M295X		24000 Mpixels/sec
	Difference: 8192 (34%)

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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 are applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.