GeForce 8800 GTS (G80) 320MB vs Radeon R5 M255

Intro

Compare those specs to the Radeon R5 M255, which has core clock speeds of 940 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 320 SPUs along with 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 8800 GTS (G80) 320MB will be 296% quicker than the Radeon R5 M255 in general, due to its higher bandwidth. (explain)

GeForce 8800 GTS (G80) 320MB		63360 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 47360 (296%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB will be quite a bit (about 31%) better at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 5824 (31%)

Pixel Rate

The GeForce 8800 GTS (G80) 320MB should be quite a bit (about 36%) more effective at anti-aliasing than the Radeon R5 M255, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 2740 (36%)

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 largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.