GeForce 8800 GT 1GB vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which has a GPU core clock speed of 950 MHz, and 3072 MB of GDDR5 RAM running at 1500 MHz through a 384-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 1GB		105 Watts
Radeon HD 7990		375 Watts
	Difference: 270 Watts (257%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be quite a bit superior to the GeForce 8800 GT 1GB in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce 8800 GT 1GB		57600 MB/sec
	Difference: 518400 (900%)

Texel Rate

The Radeon HD 7990 is a lot (more or less 624%) faster with regards to AF than the GeForce 8800 GT 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce 8800 GT 1GB		33600 Mtexels/sec
	Difference: 209600 (624%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is superior to the GeForce 8800 GT 1GB, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce 8800 GT 1GB		9600 Mpixels/sec
	Difference: 51200 (533%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.