GeForce 8800 GT 512MB vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which comes with core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 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 512MB		105 Watts
Radeon HD 5770		108 Watts
	Difference: 3 Watts (3%)

Memory Bandwidth

In theory, the Radeon HD 5770 will be 33% faster than the GeForce 8800 GT 512MB in general, due to its higher data rate. (explain)

Radeon HD 5770		76800 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 19200 (33%)

Texel Rate

The Radeon HD 5770 will be a small bit (about 1%) more effective at texture filtering than the GeForce 8800 GT 512MB. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 400 (1%)

Pixel Rate

The Radeon HD 5770 is a lot (about 42%) more effective at AA than the GeForce 8800 GT 512MB, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 4000 (42%)

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 largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high 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 number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of 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 amount of Render Output Units by the the core 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.