GeForce 8800 Ultra vs GeForce GTX 275

Intro

Compare all that to the GeForce GTX 275, which features core clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs along with 80 Texture Address Units and 28 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

The GeForce GTX 275, in theory, should perform a lot faster than the GeForce 8800 Ultra overall. (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%) more effective 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

If running with a high resolution is important to you, then the GeForce GTX 275 is the winner, by far. (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 max amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.