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GeForce 8800 Ultra vs Radeon HD 4890 2GB

Intro

The GeForce 8800 Ultra comes with a GPU core clock 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 Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM runs at a speed of 975 MHz on this particular card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra 171 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 19 Watts (11%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB will be 20% faster than the GeForce 8800 Ultra overall, because of its greater bandwidth. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 21120 (20%)

Texel Rate

The Radeon HD 4890 2GB should be just a bit (about 2%) better at AF than the GeForce 8800 Ultra. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 832 (2%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4890 2GB is superior to the GeForce 8800 Ultra, not by a very large margin though. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
GeForce 8800 Ultra 14688 Mpixels/sec
Difference: 1312 (9%)

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

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GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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 Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year May 2007 Apr 2, 2009
Code Name G80 RV790 XT
Memory 768 MB 2048 MB
Core Speed 612 MHz 1000 MHz
Memory Speed 2160 MHz 3900 MHz
Power (Max TDP) 171 watts 190 watts
Bandwidth 103680 MB/sec 124800 MB/sec
Texel Rate 39168 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 800(160x5)
Texture Mapping Units 64 40
Render Output Units 24 16
Bus Type GDDR3 GDDR5
Bus Width 384-bit 256-bit
Fab Process 90 nm 55 nm
Transistors 681 million 959 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high 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 texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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