GeForce 8800 GT 512MB vs GeForce 9800 GTX+

Intro

Compare those specs to the GeForce 9800 GTX+, which comes with a clock speed of 738 MHz and a GDDR3 memory speed of 1100 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB		105 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 40 Watts (38%)

Memory Bandwidth

In theory, the GeForce 9800 GTX+ is 22% faster than the GeForce 8800 GT 512MB overall, due to its higher bandwidth. (explain)

GeForce 9800 GTX+		70400 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX+ should be much (more or less 41%) faster with regards to texture filtering than the GeForce 8800 GT 512MB. (explain)

GeForce 9800 GTX+		47232 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 13632 (41%)

Pixel Rate

The GeForce 9800 GTX+ is much (about 23%) better at AA than the GeForce 8800 GT 512MB, and capable of handling higher resolutions while still performing well. (explain)

GeForce 9800 GTX+		11808 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 2208 (23%)

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 max amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling 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 can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.