GeForce GTX 285 2GB vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which features clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator 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

Performance-wise, the GeForce GTX 285 2GB should theoretically be much better than the Radeon HD 7790 in general. (explain)

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

Texel Rate

The Radeon HD 7790 will be a little bit (approximately 8%) faster with regards to texture 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 quite a bit (approximately 30%) more effective at FSAA than the Radeon HD 7790, and also should be able to handle higher screen 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: Bandwidth is the max amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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