GeForce 8800 GT 512MB vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which uses a 28 nm design. AMD has clocked the core frequency at 918 MHz. The GDDR5 memory runs at a speed of 1375 MHz on this specific model. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB		105 Watts
Radeon R9 285		190 Watts
	Difference: 85 Watts (81%)

Memory Bandwidth

The Radeon R9 285, in theory, should be a lot faster than the GeForce 8800 GT 512MB in general. (explain)

Radeon R9 285		176000 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 118400 (206%)

Texel Rate

The Radeon R9 285 is much (approximately 206%) more effective at texture filtering than the GeForce 8800 GT 512MB. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 69216 (206%)

Pixel Rate

The Radeon R9 285 is a lot (approximately 206%) better at anti-aliasing than the GeForce 8800 GT 512MB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 19776 (206%)

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 (measured in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 output rate also depends 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.