GeForce GTX 285 1GB vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which has a core clock speed of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790		150 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 54 Watts (36%)

Memory Bandwidth

In theory, the GeForce GTX 285 1GB will be 18% quicker than the Radeon HD 6790 overall, because of its higher data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 24576 (18%)

Texel Rate

The GeForce GTX 285 1GB is quite a bit (more or less 54%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 18240 (54%)

Pixel Rate

The GeForce GTX 285 1GB should be much (more or less 54%) more effective at FSAA than the Radeon HD 6790, and also capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 7296 (54%)

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 information (counted in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.