GeForce 8800 GT 256MB vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which comes with a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, 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

In theory, the Radeon HD 6770 is 50% faster than the GeForce 8800 GT 256MB in general, due to its higher 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 is a small bit (approximately 7%) more effective at AF 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

The Radeon HD 6770 will be quite a bit (approximately 50%) more effective at anti-aliasing than the GeForce 8800 GT 256MB, and capable of handling higher screen resolutions better. (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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 applied per second. This number 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.