GeForce GTX 285 2GB 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 as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

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 should be quite a bit faster than the Radeon HD 7770 in general. (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 texture 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

The GeForce GTX 285 2GB should be a lot (more or less 30%) more effective at full screen anti-aliasing than the Radeon HD 7770, and also able to handle higher resolutions better. (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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.