GeForce 8800 GTX vs Radeon R5 M255

Intro

Compare all of that to the Radeon R5 M255, which makes use of a 28 nm design. AMD has clocked the core frequency at 940 MHz. The DDR3 memory works at a frequency of 1000 MHz on this specific model. It features 320 SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce 8800 GTX should theoretically perform much faster than the Radeon R5 M255 overall. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 70400 (440%)

Texel Rate

The GeForce 8800 GTX should be much (more or less 96%) faster with regards to AF than the Radeon R5 M255. (explain)

GeForce 8800 GTX		36800 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 18000 (96%)

Pixel Rate

The GeForce 8800 GTX is a lot (about 84%) more effective at AA than the Radeon R5 M255, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce 8800 GTX		13800 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 6280 (84%)

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 data (in units of MB per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.