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GeForce 8800 Ultra vs Radeon HD 4790

Intro

The GeForce 8800 Ultra comes with 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 comprised of 128 Stream Processors, 64 TAUs, and 24 Raster Operation Units.

Compare those specs to the Radeon HD 4790, which has a core clock frequency of 600 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce 8800 Ultra should in theory be a little bit superior to the Radeon HD 4790 in general. (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 (more or less 104%) faster with regards to texture 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 is quite a bit (more or less 53%) faster with regards to FSAA than the Radeon HD 4790, and should be capable of handling higher screen resolutions while still performing well. (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 (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of 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 can be applied per second. This is calculated 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory 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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