GeForce GTX 650 vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which comes with GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 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 650		64 Watts
	Difference: 14 Watts (28%)

Memory Bandwidth

In theory, the GeForce GTX 650 is 11% faster than the Radeon R9 M275X overall, due to its higher data rate. (explain)

GeForce GTX 650		80000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 8000 (11%)

Texel Rate

The Radeon R9 M275X will be a little bit (more or less 6%) faster with regards to anisotropic filtering than the GeForce GTX 650. (explain)

Radeon R9 M275X		36000 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 2144 (6%)

Pixel Rate

The GeForce GTX 650 should be a small bit (approximately 18%) faster with regards to AA than the Radeon R9 M275X, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 2528 (18%)

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 (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.