GeForce GTX 285 2GB vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 96 Watts (89%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 2GB should in theory be a lot better than the Radeon HD 6770 overall. (explain)

GeForce GTX 285 2GB		158976 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 91776 (137%)

Texel Rate

The GeForce GTX 285 2GB is much (about 44%) faster with regards to texture filtering than the Radeon HD 6770. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 15840 (44%)

Pixel Rate

The GeForce GTX 285 2GB is a lot (approximately 44%) better at AA than the Radeon HD 6770, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 6336 (44%)

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 data (in units of megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total 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 in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.