Radeon R7 260X vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which comes with clock speeds of 900 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon R7 260X		115 Watts
	Difference: 65 Watts (130%)

Memory Bandwidth

In theory, the Radeon R7 260X should be 44% quicker than the Radeon R9 M275X overall, because of its greater bandwidth. (explain)

Radeon R7 260X		104000 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 32000 (44%)

Texel Rate

The Radeon R7 260X will be quite a bit (about 71%) better at AF than the Radeon R9 M275X. (explain)

Radeon R7 260X		61600 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 25600 (71%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R7 260X is superior to the Radeon R9 M275X, by far. (explain)

Radeon R7 260X		17600 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 3200 (22%)

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 maximum amount of data (counted in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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