Geforce GTX 680 vs Radeon R9 M275X

Intro

Compare that to the Radeon R9 M275X, which makes use of a 28 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 memory works at a speed of 1125 MHz on this particular model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Geforce GTX 680		195 Watts
	Difference: 145 Watts (290%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should theoretically be a lot better than the Radeon R9 M275X overall. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 120256 (167%)

Texel Rate

The Geforce GTX 680 is a lot (approximately 258%) more effective at texture filtering than the Radeon R9 M275X. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 92768 (258%)

Pixel Rate

If using a high resolution is important to you, then the Geforce GTX 680 is a better choice, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 17792 (124%)

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 transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.