GeForce 8800 GT 512MB vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this particular card. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 20 Watts (24%)

Memory Bandwidth

In theory, the Radeon HD 7790 should perform a lot faster than the GeForce 8800 GT 512MB in general. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The Radeon HD 7790 is quite a bit (more or less 67%) faster with regards to texture filtering than the GeForce 8800 GT 512MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 22400 (67%)

Pixel Rate

The Radeon HD 7790 should be a lot (approximately 67%) faster with regards to FSAA than the GeForce 8800 GT 512MB, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 6400 (67%)

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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.