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GeForce 8800 Ultra vs Radeon HD 4890 1GB

Intro

The GeForce 8800 Ultra features 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 made up of 128 Stream Processors, 64 TAUs, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 4890 1GB, which features core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 Ultra 171 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 19 Watts (11%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should in theory be a little bit better than the GeForce 8800 Ultra overall. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce 8800 Ultra 103680 MB/sec
Difference: 21120 (20%)

Texel Rate

The Radeon HD 4890 1GB is a little bit (more or less 2%) more effective at anisotropic filtering than the GeForce 8800 Ultra. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 832 (2%)

Pixel Rate

The Radeon HD 4890 1GB will be a small bit (approximately 9%) more effective at anti-aliasing than the GeForce 8800 Ultra, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4890 1GB 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 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 4890 1GB
Manufacturer nVidia AMD
Year May 2007 Apr 2, 2009
Code Name G80 RV790 XT
Memory 768 MB 1024 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 (measured in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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, 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 4890 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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