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GeForce 8800 Ultra vs Radeon HD 4870 X2

Intro

The GeForce 8800 Ultra uses a 90 nm design. nVidia has set the core speed at 612 MHz. The GDDR3 memory is set to run at a speed of 1080 MHz on this particular card. It features 128 SPUs as well as 64 Texture Address Units and 24 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4870 X2, which features a clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra 171 Watts
Radeon HD 4870 X2 350 Watts
Difference: 179 Watts (105%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 should be 122% quicker than the GeForce 8800 Ultra in general, because of its greater data rate. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 126720 (122%)

Texel Rate

The Radeon HD 4870 X2 should be a lot (approximately 53%) better at texture filtering than the GeForce 8800 Ultra. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 20832 (53%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4870 X2 is superior to the GeForce 8800 Ultra, by far. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce 8800 Ultra 14688 Mpixels/sec
Difference: 9312 (63%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4870 X2

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 X2
Manufacturer nVidia AMD
Year May 2007 Aug 12, 2008
Code Name G80 R700
Memory 768 MB 1024 MB (x2)
Core Speed 612 MHz 750 MHz (x2)
Memory Speed 2160 MHz 3600 MHz (x2)
Power (Max TDP) 171 watts 350 watts
Bandwidth 103680 MB/sec 230400 MB/sec
Texel Rate 39168 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 128 800(160x5) (x2)
Texture Mapping Units 64 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR3 GDDR5
Bus Width 384-bit 256-bit (x2)
Fab Process 90 nm 55 nm
Transistors 681 million 956 million
Bus PCIe x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4870 X2

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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