GeForce 9800 GTX+ vs GeForce 9800 GX2

Intro

Compare those specifications to the GeForce 9800 GX2, which features core speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs as well as 64 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+		145 Watts
GeForce 9800 GX2		197 Watts
	Difference: 52 Watts (36%)

Memory Bandwidth

In theory, the GeForce 9800 GX2 should be much faster than the GeForce 9800 GTX+ overall. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 57600 (82%)

Texel Rate

The GeForce 9800 GX2 is a lot (about 63%) faster with regards to texture filtering than the GeForce 9800 GTX+. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 29568 (63%)

Pixel Rate

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

GeForce 9800 GX2		19200 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 7392 (63%)

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 max amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. 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 better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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