GeForce 8600 GT 512MB DDR2 vs GeForce 9800 GX2

Intro

Compare all of that to the GeForce 9800 GX2, which comes with a GPU core clock speed of 600 MHz, and 512 MB of GDDR3 memory set to run at 1000 MHz through a 256-bit bus. It also features 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2		47 Watts
GeForce 9800 GX2		197 Watts
	Difference: 150 Watts (319%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should in theory be quite a bit superior to the GeForce 8600 GT 512MB DDR2 in general. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce 8600 GT 512MB DDR2		12800 MB/sec
	Difference: 115200 (900%)

Texel Rate

The GeForce 9800 GX2 should be much (approximately 789%) faster with regards to texture filtering than the GeForce 8600 GT 512MB DDR2. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce 8600 GT 512MB DDR2		8640 Mtexels/sec
	Difference: 68160 (789%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 9800 GX2 is the winner, by far. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce 8600 GT 512MB DDR2		4320 Mpixels/sec
	Difference: 14880 (344%)

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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.