GeForce GTX 285 2GB vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 119 Watts (140%)

Memory Bandwidth

The GeForce GTX 285 2GB should in theory be a lot faster than the Radeon HD 7790 overall. (explain)

GeForce GTX 285 2GB		158976 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 62976 (66%)

Texel Rate

The Radeon HD 7790 is just a bit (approximately 8%) faster with regards to anisotropic filtering than the GeForce GTX 285 2GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 4160 (8%)

Pixel Rate

The GeForce GTX 285 2GB will be much (approximately 30%) more effective at AA than the Radeon HD 7790, and able to handle higher resolutions while still performing well. (explain)

GeForce GTX 285 2GB		20736 Mpixels/sec
Radeon HD 7790		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 (in units of MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.