GeForce GTX 465 vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this specific card. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTX 465		200 Watts
	Difference: 115 Watts (135%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 465 should theoretically be just a bit superior to the Radeon HD 7790 overall. (explain)

GeForce GTX 465		102592 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 6592 (7%)

Texel Rate

The Radeon HD 7790 is quite a bit (approximately 110%) faster with regards to anisotropic filtering than the GeForce GTX 465. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 29292 (110%)

Pixel Rate

The GeForce GTX 465 should be quite a bit (about 21%) faster with regards to AA than the Radeon HD 7790, and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 3424 (21%)

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 data (in units of megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If 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 clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one 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 sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.