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GeForce 8800 Ultra vs Radeon HD 4870 512MB

Intro

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

Compare those specifications to the Radeon HD 4870 512MB, which uses a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 512MB 150 Watts
GeForce 8800 Ultra 171 Watts
Difference: 21 Watts (14%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB should be just a bit faster than the GeForce 8800 Ultra in general. (explain)

Radeon HD 4870 512MB 115200 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 11520 (11%)

Texel Rate

The GeForce 8800 Ultra should be a lot (more or less 31%) faster with regards to anisotropic filtering than the Radeon HD 4870 512MB. (explain)

GeForce 8800 Ultra 39168 Mtexels/sec
Radeon HD 4870 512MB 30000 Mtexels/sec
Difference: 9168 (31%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 8800 Ultra is the winner, and very much so. (explain)

GeForce 8800 Ultra 14688 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 2688 (22%)

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 4870 512MB

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 4870 512MB
Manufacturer nVidia AMD
Year May 2007 Jun 25, 2008
Code Name G80 RV770 XT
Memory 768 MB 512 MB
Core Speed 612 MHz 750 MHz
Memory Speed 2160 MHz 3600 MHz
Power (Max TDP) 171 watts 150 watts
Bandwidth 103680 MB/sec 115200 MB/sec
Texel Rate 39168 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 12000 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 956 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 max amount of information (measured in megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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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