GeForce 9800 GX2 vs GeForce GT 440 1.5GB

Intro

Compare those specifications to the GeForce GT 440 1.5GB, which has core clock speeds of 594 MHz on the GPU, and 900 MHz on the 1536 MB of GDDR3 memory. It features 144 SPUs as well as 24 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 1.5GB		56 Watts
GeForce 9800 GX2		197 Watts
	Difference: 141 Watts (252%)

Memory Bandwidth

The GeForce 9800 GX2 should theoretically perform quite a bit faster than the GeForce GT 440 1.5GB in general. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GT 440 1.5GB		43200 MB/sec
	Difference: 84800 (196%)

Texel Rate

The GeForce 9800 GX2 will be much (about 439%) better at anisotropic filtering than the GeForce GT 440 1.5GB. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GT 440 1.5GB		14256 Mtexels/sec
	Difference: 62544 (439%)

Pixel Rate

The GeForce 9800 GX2 is a lot (approximately 35%) faster with regards to FSAA than the GeForce GT 440 1.5GB, and able to handle higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GT 440 1.5GB		14256 Mpixels/sec
	Difference: 4944 (35%)

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 (in units of MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.

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

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