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GeForce 8800 Ultra vs Radeon HD 4850 X2 1GB

Intro

The GeForce 8800 Ultra has a GPU 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 TAUs, and 24 ROPs.

Compare that to the Radeon HD 4850 X2 1GB, which features GPU core speed of 625 MHz, and 1024 MB of GDDR3 memory running at 993 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra 171 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 79 Watts (46%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 1GB should theoretically be quite a bit better than the GeForce 8800 Ultra overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 23424 (23%)

Texel Rate

The Radeon HD 4850 X2 1GB is a lot (approximately 28%) more effective at texture filtering than the GeForce 8800 Ultra. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 10832 (28%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4850 X2 1GB is superior to the GeForce 8800 Ultra, and very much so. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce 8800 Ultra 14688 Mpixels/sec
Difference: 5312 (36%)

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 4850 X2 1GB

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 4850 X2 1GB
Manufacturer nVidia AMD
Year May 2007 Nov 7, 2008
Code Name G80 R700
Memory 768 MB 1024 MB (x2)
Core Speed 612 MHz 625 MHz (x2)
Memory Speed 2160 MHz 1986 MHz (x2)
Power (Max TDP) 171 watts 250 watts
Bandwidth 103680 MB/sec 127104 MB/sec
Texel Rate 39168 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 128 800(160x5) (x2)
Texture Mapping Units 64 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR3 GDDR3
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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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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