GeForce 8800 GT 1GB vs Radeon HD 7770

Intro

Compare all that to the Radeon HD 7770, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce 8800 GT 1GB		105 Watts
	Difference: 25 Watts (31%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 will be 25% faster than the GeForce 8800 GT 1GB overall, because of its higher data rate. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 8800 GT 1GB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon HD 7770 is just a bit (more or less 19%) better at AF than the GeForce 8800 GT 1GB. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 8800 GT 1GB		33600 Mtexels/sec
	Difference: 6400 (19%)

Pixel Rate

The Radeon HD 7770 is quite a bit (approximately 67%) faster with regards to full screen anti-aliasing than the GeForce 8800 GT 1GB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 8800 GT 1GB		9600 Mpixels/sec
	Difference: 6400 (67%)

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 max amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 texture map elements (texels) that are processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. 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 quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.