GeForce GTX 275 vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which has GPU clock speed of 900 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 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 275		219 Watts
	Difference: 169 Watts (338%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 should be a lot faster than the Radeon R9 M275X in general. (explain)

GeForce GTX 275		127008 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 55008 (76%)

Texel Rate

The GeForce GTX 275 is a lot (approximately 41%) better at texture filtering than the Radeon R9 M275X. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 14640 (41%)

Pixel Rate

The GeForce GTX 275 will be a lot (more or less 23%) faster with regards to FSAA than the Radeon R9 M275X, and also should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 3324 (23%)

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 information (measured in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 applied per second. This figure is worked out by multiplying the total amount 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out 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 outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.