GeForce GTX 285 1GB vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which comes with clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs along with 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 GTX 285 1GB		204 Watts
	Difference: 124 Watts (155%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB should be much faster than the Radeon HD 7770 in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 86976 (121%)

Texel Rate

The GeForce GTX 285 1GB is quite a bit (more or less 30%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 11840 (30%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 285 1GB is a better choice, by a large margin. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 4736 (30%)

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 (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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