GeForce GTX 465 vs Radeon HD 4790

Intro

Compare all that to the Radeon HD 4790, which has a GPU core clock speed of 600 MHz, and 512 MB of GDDR5 memory running at 800 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the GeForce GTX 465 should be just a bit faster than the Radeon HD 4790 in general. (explain)

GeForce GTX 465		102592 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 192 (0%)

Texel Rate

The GeForce GTX 465 should be a lot (more or less 39%) better at anisotropic filtering than the Radeon HD 4790. (explain)

GeForce GTX 465		26708 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 7508 (39%)

Pixel Rate

The GeForce GTX 465 is quite a bit (more or less 102%) more effective at anti-aliasing than the Radeon HD 4790, and also able to handle higher resolutions better. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 9824 (102%)

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 data (measured in MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.