GeForce GTX 295 vs Radeon R9 M275X

Intro

Compare all that to the Radeon R9 M275X, which uses a 28 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory works at a speed of 1125 MHz on this card. It features 640 SPUs along with 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
GeForce GTX 295		289 Watts
	Difference: 239 Watts (478%)

Memory Bandwidth

Performance-wise, the GeForce GTX 295 should in theory be quite a bit superior to the Radeon R9 M275X overall. (explain)

GeForce GTX 295		223776 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 151776 (211%)

Texel Rate

The GeForce GTX 295 is a lot (more or less 156%) faster with regards to anisotropic filtering than the Radeon R9 M275X. (explain)

GeForce GTX 295		92160 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 56160 (156%)

Pixel Rate

The GeForce GTX 295 will be quite a bit (about 124%) more effective at full screen anti-aliasing than the Radeon R9 M275X, and will be able to handle higher screen resolutions better. (explain)

GeForce GTX 295		32256 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 17856 (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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock 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 better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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 get to the max fill rate.