GeForce 8800 Ultra vs GeForce GTX 275

Intro

Compare those specs to the GeForce GTX 275, which comes with core speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs as well as 80 Texture Address Units and 28 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra		171 Watts
GeForce GTX 275		219 Watts
	Difference: 48 Watts (28%)

Memory Bandwidth

In theory, the GeForce GTX 275 should be 23% quicker than the GeForce 8800 Ultra in general, due to its greater data rate. (explain)

GeForce GTX 275		127008 MB/sec
GeForce 8800 Ultra		103680 MB/sec
	Difference: 23328 (23%)

Texel Rate

The GeForce GTX 275 is much (approximately 29%) better at AF than the GeForce 8800 Ultra. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce 8800 Ultra		39168 Mtexels/sec
	Difference: 11472 (29%)

Pixel Rate

The GeForce GTX 275 will be much (approximately 21%) more effective at anti-aliasing than the GeForce 8800 Ultra, and will be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce 8800 Ultra		14688 Mpixels/sec
	Difference: 3036 (21%)

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: Bandwidth is the largest amount of information (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the 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 drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of 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.