GeForce GTX 275 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which has GPU core speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also features 800 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce GTX 275		219 Watts
	Difference: 111 Watts (103%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 is 89% faster than the Radeon HD 6770 overall, because of its higher data rate. (explain)

GeForce GTX 275		127008 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 59808 (89%)

Texel Rate

The GeForce GTX 275 should be much (about 41%) more effective at anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 14640 (41%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 275 is the winner, and very much so. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 3324 (23%)

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 maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card 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 amount 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 also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.