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GeForce 8800 GS vs Radeon HD 7770

Intro

The GeForce 8800 GS features a core clock speed of 550 MHz and a GDDR3 memory speed of 800 MHz. It also makes use of a 192-bit memory bus, and makes use of a 65 nm design. It features 96 SPUs, 48 Texture Address Units, and 12 ROPs.

Compare that to the Radeon HD 7770, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 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 should theoretically perform a lot 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 much (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

The Radeon HD 7770 will be quite a bit (about 142%) faster with regards to anti-aliasing than the GeForce 8800 GS, and also will be capable of handling higher screen resolutions more effectively. (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: Bandwidth is the largest amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the 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 that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

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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