Geforce GTX 690 vs Radeon R9 M275X

Intro

Compare those specifications to the Radeon R9 M275X, which comes with a clock frequency of 900 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Geforce GTX 690		300 Watts
	Difference: 250 Watts (500%)

Memory Bandwidth

In theory, the Geforce GTX 690 is 434% faster than the Radeon R9 M275X in general, due to its greater bandwidth. (explain)

Geforce GTX 690		384512 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 312512 (434%)

Texel Rate

The Geforce GTX 690 will be much (approximately 551%) better at texture filtering than the Radeon R9 M275X. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon R9 M275X		36000 Mtexels/sec
	Difference: 198240 (551%)

Pixel Rate

The Geforce GTX 690 should be much (about 307%) faster with regards to full screen anti-aliasing than the Radeon R9 M275X, and should be able to handle higher resolutions more effectively. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon R9 M275X		14400 Mpixels/sec
	Difference: 44160 (307%)

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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number 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 graphics 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 most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.