GeForce 8800 GTX vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. 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 8800 GTX		155 Watts
	Difference: 70 Watts (82%)

Memory Bandwidth

Performance-wise, the Radeon HD 7790 should in theory be a bit superior to the GeForce 8800 GTX overall. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 8800 GTX		86400 MB/sec
	Difference: 9600 (11%)

Texel Rate

The Radeon HD 7790 should be much (more or less 52%) faster with regards to anisotropic filtering than the GeForce 8800 GTX. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 8800 GTX		36800 Mtexels/sec
	Difference: 19200 (52%)

Pixel Rate

The Radeon HD 7790 is a small bit (approximately 16%) faster with regards to AA than the GeForce 8800 GTX, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 2200 (16%)

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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the 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 maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core 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 output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.