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GeForce 8800 Ultra vs GeForce GTX 275

Intro

The GeForce 8800 Ultra features a GPU core speed of 612 MHz, and the 768 MB of GDDR3 RAM runs at 1080 MHz through a 384-bit bus. It also is made up of 128 Stream Processors, 64 Texture Address Units, and 24 Raster Operation Units.

Compare that to the GeForce GTX 275, which makes use of a 55 nm design. nVidia has set the core speed at 633 MHz. The GDDR3 memory runs at a frequency of 1134 MHz on this model. It features 240 SPUs along with 80 Texture Address Units and 28 ROPs.

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

The GeForce GTX 275, in theory, should be quite a bit faster than the GeForce 8800 Ultra in general. (explain)

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

Texel Rate

The GeForce GTX 275 should be quite a bit (about 29%) faster with regards to 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 should be a lot (more or less 21%) better at AA than the GeForce 8800 Ultra, and also capable of handling higher resolutions more effectively. (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

Display Prices

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GeForce 8800 Ultra

Amazon.com

Check prices at:

GeForce GTX 275

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 8800 Ultra GeForce GTX 275
Manufacturer nVidia nVidia
Year May 2007 April 9, 2009
Code Name G80 G200b
Memory 768 MB 896 MB
Core Speed 612 MHz 633 MHz
Memory Speed 2160 MHz 2268 MHz
Power (Max TDP) 171 watts 219 watts
Bandwidth 103680 MB/sec 127008 MB/sec
Texel Rate 39168 Mtexels/sec 50640 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 17724 Mpixels/sec
Unified Shaders 128 240
Texture Mapping Units 64 80
Render Output Units 24 28
Bus Type GDDR3 GDDR3
Bus Width 384-bit 448-bit
Fab Process 90 nm 55 nm
Transistors 681 million 1400 million
Bus PCIe x16 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.1

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the 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 maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units 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 rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

GeForce GTX 275

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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