GeForce GTX 285 2GB vs Radeon HD 7770

Intro

Compare all that to the Radeon HD 7770, which features GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 124 Watts (155%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB will be 121% faster than the Radeon HD 7770 in general, because of its greater data rate. (explain)

GeForce GTX 285 2GB		158976 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 86976 (121%)

Texel Rate

The GeForce GTX 285 2GB will be a lot (about 30%) better at anisotropic filtering than the Radeon HD 7770. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 11840 (30%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 285 2GB is a better choice, by far. (explain)

GeForce GTX 285 2GB		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 largest amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 is also dependant 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.