GeForce 8800 GTS (G80) 640MB vs Radeon R7 250

Intro

Compare all of that to the Radeon R7 250, which uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1150 MHz on this model. It features 384 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 78 Watts (120%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 should perform a bit faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

Radeon R7 250		73600 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 10240 (16%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB is a little bit (about 3%) better at anisotropic filtering than the Radeon R7 250. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 624 (3%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 8800 GTS (G80) 640MB is the winner, and very much so. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 2260 (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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.