GeForce GTX 275 vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this model. It features 1024 SPUs as well as 64 TAUs and 32 ROPs.

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, the Radeon HD 7850 should perform quite a bit faster than the GeForce GTX 275 in general. (explain)

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

Texel Rate

The Radeon HD 7850 should be a little bit (approximately 9%) more effective at AF than the GeForce GTX 275. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7850 is superior to the GeForce GTX 275, and very much so. (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: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.