GeForce 9800 GX2 vs GeForce GT 240 GDDR5

Intro

Compare all of that to the GeForce GT 240 GDDR5, which features clock speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 memory. It features 96 SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
GeForce 9800 GX2		197 Watts
	Difference: 127 Watts (181%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 will be 135% quicker than the GeForce GT 240 GDDR5 overall, because of its greater data rate. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 73600 (135%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 336%) better at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 59200 (336%)

Pixel Rate

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

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 14800 (336%)

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 data (in units of MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 number is calculated by multiplying the total number of texture units 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 processed in one second.

Pixel Rate: Pixel rate is the most 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 Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.