GeForce 8800 GTS (G80) 640MB vs GeForce 9800 GTX+

Intro

Compare those specs to the GeForce 9800 GTX+, which uses a 55 nm design. nVidia has set the core speed at 738 MHz. The GDDR3 RAM works at a frequency of 1100 MHz on this specific card. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 2 Watts (1%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GTX+ will be 11% faster than the GeForce 8800 GTS (G80) 640MB in general, because of its greater data rate. (explain)

GeForce 9800 GTX+		70400 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 7040 (11%)

Texel Rate

The GeForce 9800 GTX+ is a lot (more or less 92%) better at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce 9800 GTX+		47232 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 22608 (92%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 9800 GTX+ is the winner, though only just barely. (explain)

GeForce 9800 GTX+		11808 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 1548 (15%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics 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 the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.