GeForce GTX 285 1GB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which comes with 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 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 119 Watts (140%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB is 66% faster than the Radeon HD 7790 in general, due to its greater data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 62976 (66%)

Texel Rate

The Radeon HD 7790 should be just a bit (approximately 8%) better at texture filtering than the GeForce GTX 285 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 4160 (8%)

Pixel Rate

The GeForce GTX 285 1GB is a lot (more or less 30%) better at full screen anti-aliasing than the Radeon HD 7790, and capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 285 1GB		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: Bandwidth is the maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. 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 bandwidth is, the lower the potential to get to the max fill rate.