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GeForce 8800 GTS (G80) 640MB vs Radeon HD 4770

Intro

The GeForce 8800 GTS (G80) 640MB features a GPU core speed of 513 MHz, and the 640 MB of GDDR3 memory runs at 792 MHz through a 320-bit bus. It also is made up of 96 SPUs, 48 Texture Address Units, and 20 Raster Operation Units.

Compare those specs to the Radeon HD 4770, which has a clock frequency of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
GeForce 8800 GTS (G80) 640MB 143 Watts
Difference: 63 Watts (79%)

Memory Bandwidth

The GeForce 8800 GTS (G80) 640MB should in theory perform much faster than the Radeon HD 4770 overall. (explain)

GeForce 8800 GTS (G80) 640MB 63360 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12160 (24%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB should be a bit (more or less 3%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 624 (3%)

Pixel Rate

The Radeon HD 4770 should be a bit (more or less 17%) faster with regards to FSAA than the GeForce 8800 GTS (G80) 640MB, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4770 12000 Mpixels/sec
GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
Difference: 1740 (17%)

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 GTS (G80) 640MB

Amazon.com

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Radeon HD 4770

Amazon.com

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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 GTS (G80) 640MB Radeon HD 4770
Manufacturer nVidia AMD
Year Nov 2006 (640) Apr 28, 2009
Code Name G80 RV740
Memory 640 MB 512 MB
Core Speed 513 MHz 750 MHz
Memory Speed 1584 MHz 3200 MHz
Power (Max TDP) 143 watts 80 watts
Bandwidth 63360 MB/sec 51200 MB/sec
Texel Rate 24624 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 96 640(128x5)
Texture Mapping Units 48 32
Render Output Units 20 16
Bus Type GDDR3 GDDR5
Bus Width 320-bit 128-bit
Fab Process 90 nm 40 nm
Transistors 681 million 826 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 largest amount of information (in units of MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at 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 could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 8800 GTS (G80) 640MB

Amazon.com

Check prices at:

Radeon HD 4770

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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