GeForce 9800 GX2 vs GeForce GT 340

Intro

Compare that to the GeForce GT 340, which features a core clock speed of 550 MHz and a GDDR5 memory frequency of 850 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 96 SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce 9800 GX2		197 Watts
	Difference: 128 Watts (186%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GX2 should theoretically be quite a bit better than the GeForce GT 340 in general. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 73600 (135%)

Texel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 336%) more effective at texture filtering than the GeForce GT 340. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 59200 (336%)

Pixel Rate

The GeForce 9800 GX2 will be quite a bit (more or less 336%) more effective at AA than the GeForce GT 340, and should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GT 340		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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.