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

Intro

Compare those specs to the GeForce 9800 GTX+, which makes use of a 55 nm design. nVidia has set the core speed at 738 MHz. The GDDR3 RAM runs at a speed of 1100 MHz on this model. It features 128 SPUs as well as 64 TAUs 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

Performance-wise, the GeForce 9800 GTX+ should theoretically be a bit superior to the GeForce 8800 GTS (G80) 640MB overall. (explain)

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

Texel Rate

The GeForce 9800 GTX+ should be a lot (approximately 92%) more effective at AF 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

The GeForce 9800 GTX+ will be a bit (approximately 15%) better at full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also should be capable of handling higher resolutions while still performing well. (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 maximum amount of information (in units of MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.