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GeForce 8800 Ultra vs Radeon HD 7790

Intro

The GeForce 8800 Ultra has a clock speed of 612 MHz and a GDDR3 memory speed of 1080 MHz. It also makes use of a 384-bit memory bus, and makes use of a 90 nm design. It is made up of 128 SPUs, 64 TAUs, and 24 ROPs.

Compare those specs to the Radeon HD 7790, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs along with 56 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
GeForce 8800 Ultra 171 Watts
Difference: 86 Watts (101%)

Memory Bandwidth

In theory, the GeForce 8800 Ultra should be 8% quicker than the Radeon HD 7790 overall, due to its higher data rate. (explain)

GeForce 8800 Ultra 103680 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 7680 (8%)

Texel Rate

The Radeon HD 7790 will be a lot (more or less 43%) faster with regards to AF than the GeForce 8800 Ultra. (explain)

Radeon HD 7790 56000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 16832 (43%)

Pixel Rate

The Radeon HD 7790 should be a little bit (about 9%) more effective at FSAA than the GeForce 8800 Ultra, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7790 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 7790

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 7790
Manufacturer nVidia AMD
Year May 2007 March 2013
Code Name G80 Bonaire XT
Memory 768 MB 1024 MB
Core Speed 612 MHz 1000 MHz
Memory Speed 2160 MHz 6000 MHz
Power (Max TDP) 171 watts 85 watts
Bandwidth 103680 MB/sec 96000 MB/sec
Texel Rate 39168 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 896
Texture Mapping Units 64 56
Render Output Units 24 16
Bus Type GDDR3 GDDR5
Bus Width 384-bit 128-bit
Fab Process 90 nm 28 nm
Transistors 681 million 2080 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory 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 worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 7790

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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