GeForce 9800 GX2 vs GeForce GT 220 GDDR3

Intro

Compare those specs to the GeForce GT 220 GDDR3, which comes with a core clock frequency of 625 MHz and a GDDR3 memory speed of 1012 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 48 SPUs, 16 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 220 GDDR3		58 Watts
GeForce 9800 GX2		197 Watts
	Difference: 139 Watts (240%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should in theory be a lot superior to the GeForce GT 220 GDDR3 overall. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GT 220 GDDR3		32384 MB/sec
	Difference: 95616 (295%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 668%) faster with regards to anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 66800 (668%)

Pixel Rate

The GeForce 9800 GX2 will be quite a bit (about 284%) better at AA than the GeForce GT 220 GDDR3, and also capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GT 220 GDDR3		5000 Mpixels/sec
	Difference: 14200 (284%)

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 maximum amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high 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 the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.