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GeForce 8800 GS vs Radeon HD 7770

Intro

The GeForce 8800 GS makes use of a 65 nm design. nVidia has clocked the core speed at 550 MHz. The GDDR3 memory is set to run at a speed of 800 MHz on this specific model. It features 96 SPUs along with 48 TAUs and 12 ROPs.

Compare that to the Radeon HD 7770, which comes with GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce 8800 GS 105 Watts
Difference: 25 Watts (31%)

Memory Bandwidth

The Radeon HD 7770, in theory, should be much faster than the GeForce 8800 GS in general. (explain)

Radeon HD 7770 72000 MB/sec
GeForce 8800 GS 38400 MB/sec
Difference: 33600 (88%)

Texel Rate

The Radeon HD 7770 should be quite a bit (about 52%) better at AF than the GeForce 8800 GS. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce 8800 GS 26400 Mtexels/sec
Difference: 13600 (52%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7770 is the winner, and very much so. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce 8800 GS 6600 Mpixels/sec
Difference: 9400 (142%)

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 GS

Amazon.com

Check prices at:

Radeon HD 7770

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 GS Radeon HD 7770
Manufacturer nVidia AMD
Year Jan 2008 February 2012
Code Name G92 Cape Verde XT
Memory 384 MB 1024 MB
Core Speed 550 MHz 1000 MHz
Memory Speed 1600 MHz 4500 MHz
Power (Max TDP) 105 watts 80 watts
Bandwidth 38400 MB/sec 72000 MB/sec
Texel Rate 26400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 6600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 96 640
Texture Mapping Units 48 40
Render Output Units 12 16
Bus Type GDDR3 GDDR5
Bus Width 192-bit 128-bit
Fab Process 65 nm 28 nm
Transistors 754 million 1500 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per 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 better this number, the better the video 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 that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 8800 GS

Amazon.com

Check prices at:

Radeon HD 7770

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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