GeForce 8800 GS vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 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 GS		105 Watts
	Difference: 20 Watts (24%)

Memory Bandwidth

The Radeon HD 7790 should in theory be quite a bit faster than the GeForce 8800 GS overall. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 8800 GS		38400 MB/sec
	Difference: 57600 (150%)

Texel Rate

The Radeon HD 7790 is much (approximately 112%) more effective at anisotropic filtering than the GeForce 8800 GS. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 8800 GS		26400 Mtexels/sec
	Difference: 29600 (112%)

Pixel Rate

The Radeon HD 7790 is much (about 142%) better at full screen anti-aliasing than the GeForce 8800 GS, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 8800 GS		6600 Mpixels/sec
	Difference: 9400 (142%)

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 (in units of MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.