GeForce GTX 275 vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which has a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also features 1024 Stream Processors, 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 speaking, the Radeon HD 7850 should perform a lot faster than the GeForce GTX 275 overall. (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 bit (approximately 9%) better at texture 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 much (about 55%) faster with regards to FSAA than the GeForce GTX 275, and should be able to handle higher screen resolutions more effectively. (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 data (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per 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 filling the screen with pixels (the image). The actual pixel output 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 potential to reach the maximum fill rate.