GeForce 8800 Ultra vs GeForce GTX 275

Intro

The GeForce 8800 Ultra has a GPU clock speed of 612 MHz, and the 768 MB of GDDR3 RAM runs at 1080 MHz through a 384-bit bus. It also is comprised of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the GeForce GTX 275, which comes with a core clock speed of 633 MHz and a GDDR3 memory speed of 1134 MHz. It also uses a 448-bit memory bus, and uses a 55 nm design. It features 240 SPUs, 80 Texture Address Units, and 28 ROPs.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce 8800 Ultra Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

GeForce GTX 275 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce 8800 Ultra	GeForce GTX 275
Manufacturer	nVidia	nVidia
Year	May 2007	April 9, 2009
Code Name	G80	G200b
Fab Process	90 nm	55 nm
Bus	PCIe x16	PCIe x16 2.0
Memory	768 MB	896 MB
Core Speed	612 MHz	633 MHz
Shader Speed	1500 MHz	1404 MHz
Memory Speed	1080 MHz	1134 MHz
Unified Shaders	128	240
Texture Mapping Units	64	80
Render Output Units	24	28
Bus Type	GDDR3	GDDR3
Bus Width	384-bit	448-bit
DirectX Version	DirectX 10	DirectX 10
OpenGL Version	OpenGL 3.0	OpenGL 3.1
Power (Max TDP)	171 watts	219 watts
Shader Model	4.0	4.0
Bandwidth	103680 MB/sec	127008 MB/sec
Texel Rate	39168 Mtexels/sec	50640 Mtexels/sec
Pixel Rate	14688 Mpixels/sec	17724 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.