GeForce GTX 285 2GB vs Radeon HD 7770

Intro

Compare all that to the Radeon HD 7770, which comes with core speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. 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

The GeForce GTX 285 2GB should in theory perform much 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 is a lot (approximately 30%) faster with regards to 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

If running with a high resolution is important to you, then the GeForce GTX 285 2GB is superior to the Radeon HD 7770, and very much so. (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: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must 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 AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.