GeForce GTX 460 2GB vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which features a GPU core clock speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also features 800 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790		150 Watts
GeForce GTX 460 2GB		160 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

The Radeon HD 6790 should in theory perform a little bit faster than the GeForce GTX 460 2GB overall. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GTX 460 2GB		115200 MB/sec
	Difference: 19200 (17%)

Texel Rate

The GeForce GTX 460 2GB will be a small bit (approximately 13%) more effective at AF than the Radeon HD 6790. (explain)

GeForce GTX 460 2GB		37800 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 4200 (13%)

Pixel Rate

The GeForce GTX 460 2GB will be quite a bit (about 61%) more effective at AA than the Radeon HD 6790, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 460 2GB		21600 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 8160 (61%)

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 (counted in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher 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 maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.