GeForce GTX 285 2GB vs Radeon HD 7950

Intro

Compare those specifications to the Radeon HD 7950, which has GPU clock speed of 800 MHz, and 1536 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950		200 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 4 Watts (2%)

Memory Bandwidth

In theory, the Radeon HD 7950 should be 51% quicker than the GeForce GTX 285 2GB overall, due to its greater bandwidth. (explain)

Radeon HD 7950		240000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 81024 (51%)

Texel Rate

The Radeon HD 7950 should be a lot (about 73%) faster with regards to AF than the GeForce GTX 285 2GB. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 37760 (73%)

Pixel Rate

The Radeon HD 7950 will be much (about 23%) more effective at FSAA than the GeForce GTX 285 2GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 4864 (23%)

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 largest amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses 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 processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 - the lower the bandwidth is, the lower the ability to get to the max fill rate.