GeForce GTX 275 vs Radeon R9 M270X

Intro

Compare those specifications to the Radeon R9 M270X, which makes use of a 28 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this specific model. 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

Memory Bandwidth

Theoretically, the GeForce GTX 275 should perform quite a bit faster than the Radeon R9 M270X in general. (explain)

GeForce GTX 275		127008 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 55008 (76%)

Texel Rate

The GeForce GTX 275 should be much (approximately 75%) better at anisotropic filtering than the Radeon R9 M270X. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 21640 (75%)

Pixel Rate

The GeForce GTX 275 will be much (about 53%) better at full screen anti-aliasing than the Radeon R9 M270X, and will be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 6124 (53%)

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 max amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.