GeForce 9800 GX2 vs GeForce GTS 150

Intro

Compare those specifications to the GeForce GTS 150, which has GPU core speed of 740 MHz, and 1024 MB of GDDR3 RAM running at 500 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 150		141 Watts
GeForce 9800 GX2		197 Watts
	Difference: 56 Watts (40%)

Memory Bandwidth

The GeForce 9800 GX2 should theoretically perform quite a bit faster than the GeForce GTS 150 in general. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 96000 (300%)

Texel Rate

The GeForce 9800 GX2 will be much (approximately 62%) better at AF than the GeForce GTS 150. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GTS 150		47360 Mtexels/sec
	Difference: 29440 (62%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 9800 GX2 is the winner, by a large margin. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GTS 150		11840 Mpixels/sec
	Difference: 7360 (62%)

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 information (measured in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.