GeForce 8800 GT 256MB vs Radeon R5 M255

Intro

Compare that to the Radeon R5 M255, which makes use of a 28 nm design. AMD has set the core speed at 940 MHz. The DDR3 RAM runs at a speed of 1000 MHz on this particular model. It features 320 SPUs as well as 20 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce 8800 GT 256MB should in theory be a lot faster than the Radeon R5 M255 in general. (explain)

GeForce 8800 GT 256MB		44800 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 28800 (180%)

Texel Rate

The GeForce 8800 GT 256MB should be quite a bit (approximately 79%) more effective at anisotropic filtering than the Radeon R5 M255. (explain)

GeForce 8800 GT 256MB		33600 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 14800 (79%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 8800 GT 256MB is a better choice, by a large margin. (explain)

GeForce 8800 GT 256MB		9600 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 2080 (28%)

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 moved across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.