GeForce 8800 GT 256MB vs Radeon HD 6770

Intro

Compare that to the Radeon HD 6770, which uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this particular model. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 256MB		105 Watts
Radeon HD 6770		108 Watts
	Difference: 3 Watts (3%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 is 50% quicker than the GeForce 8800 GT 256MB overall, because of its greater data rate. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 22400 (50%)

Texel Rate

The Radeon HD 6770 will be just a bit (about 7%) more effective at anisotropic filtering than the GeForce 8800 GT 256MB. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 2400 (7%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6770 is the winner, and very much so. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 4800 (50%)

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 maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.