GeForce GTX 275 vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which comes with GPU clock speed of 860 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also features 1024 Stream Processors, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850		130 Watts
GeForce GTX 275		219 Watts
	Difference: 89 Watts (68%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 is 21% faster than the GeForce GTX 275 in general, due to its higher bandwidth. (explain)

Radeon HD 7850		153600 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 26592 (21%)

Texel Rate

The Radeon HD 7850 will be a bit (more or less 9%) better at anisotropic filtering than the GeForce GTX 275. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 4400 (9%)

Pixel Rate

The Radeon HD 7850 is a lot (approximately 55%) better at anti-aliasing than the GeForce GTX 275, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 9796 (55%)

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 largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.