GeForce 9800 GX2 vs GeForce GTX 650 Ti

Intro

Compare those specs to the GeForce GTX 650 Ti, which uses a 28 nm design. nVidia has clocked the core speed at 928 MHz. The GDDR5 memory runs at a frequency of 1350 MHz on this particular card. It features 768 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti		110 Watts
GeForce 9800 GX2		197 Watts
	Difference: 87 Watts (79%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GX2 is 48% faster than the GeForce GTX 650 Ti in general, due to its higher data rate. (explain)

GeForce 9800 GX2		128000 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 41600 (48%)

Texel Rate

The GeForce 9800 GX2 should be quite a bit (more or less 29%) better at texture filtering than the GeForce GTX 650 Ti. (explain)

GeForce 9800 GX2		76800 Mtexels/sec
GeForce GTX 650 Ti		59392 Mtexels/sec
	Difference: 17408 (29%)

Pixel Rate

The GeForce 9800 GX2 should be much (about 29%) faster with regards to full screen anti-aliasing than the GeForce GTX 650 Ti, and also should be capable of handling higher screen resolutions better. (explain)

GeForce 9800 GX2		19200 Mpixels/sec
GeForce GTX 650 Ti		14848 Mpixels/sec
	Difference: 4352 (29%)

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 maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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