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GeForce 8800 Ultra vs Radeon HD 4790

Intro

The GeForce 8800 Ultra has a core clock speed of 612 MHz and a GDDR3 memory frequency of 1080 MHz. It also uses a 384-bit bus, and uses a 90 nm design. It features 128 SPUs, 64 TAUs, and 24 Raster Operation Units.

Compare those specs to the Radeon HD 4790, which makes use of a 55 nm design. AMD has set the core speed at 600 MHz. The GDDR5 memory runs at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce 8800 Ultra should in theory be just a bit superior to the Radeon HD 4790 overall. (explain)

GeForce 8800 Ultra 103680 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 1280 (1%)

Texel Rate

The GeForce 8800 Ultra will be much (approximately 104%) better at anisotropic filtering than the Radeon HD 4790. (explain)

GeForce 8800 Ultra 39168 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 19968 (104%)

Pixel Rate

The GeForce 8800 Ultra will be a lot (more or less 53%) better at anti-aliasing than the Radeon HD 4790, and should be capable of handling higher resolutions more effectively. (explain)

GeForce 8800 Ultra 14688 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 5088 (53%)

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 4790

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 4790
Manufacturer nVidia AMD
Year May 2007 2009
Code Name G80 RV790
Memory 768 MB 512 MB
Core Speed 612 MHz 600 MHz
Memory Speed 2160 MHz 3200 MHz
Power (Max TDP) 171 watts (Unknown) watts
Bandwidth 103680 MB/sec 102400 MB/sec
Texel Rate 39168 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 128 640(128x5)
Texture Mapping Units 64 32
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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 4790

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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