GeForce 9800 GX2 vs GeForce GT 440 1.5GB

Intro

Compare those specs to the GeForce GT 440 1.5GB, which features GPU core speed of 594 MHz, and 1536 MB of GDDR3 memory set to run at 900 MHz through a 192-bit bus. It also is comprised of 144 Stream Processors, 24 TAUs, and 24 Raster Operation Units.

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

Performance-wise, the GeForce 9800 GX2 should theoretically be a lot better than the GeForce GT 440 1.5GB overall. (explain)

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

Texel Rate

The GeForce 9800 GX2 should be a lot (about 439%) faster with regards to texture 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 should be quite a bit (more or less 35%) better at anti-aliasing than the GeForce GT 440 1.5GB, and should be able to handle higher resolutions better. (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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 can be applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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