GeForce 8800 GTS (G80) 640MB vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which comes with a core clock frequency of 575 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M265X is 14% quicker than the GeForce 8800 GTS (G80) 640MB overall, due to its greater bandwidth. (explain)

Radeon R9 M265X		72000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 8640 (14%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB should be a small bit (more or less 7%) better at texture filtering than the Radeon R9 M265X. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 1624 (7%)

Pixel Rate

The GeForce 8800 GTS (G80) 640MB will be a bit (more or less 12%) better at AA than the Radeon R9 M265X, and able to handle higher resolutions more effectively. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 1060 (12%)

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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, 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 maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.