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GeForce 8800 GTX vs Radeon HD 7770

Intro

The GeForce 8800 GTX comes with clock speeds of 575 MHz on the GPU, and 900 MHz on the 768 MB of GDDR3 memory. It features 128 SPUs along with 64 TAUs and 24 Rasterization Operator Units.

Compare that to the Radeon HD 7770, which features a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is comprised of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce 8800 GTX 155 Watts
Difference: 75 Watts (94%)

Memory Bandwidth

In theory, the GeForce 8800 GTX should perform a small bit faster than the Radeon HD 7770 in general. (explain)

GeForce 8800 GTX 86400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 14400 (20%)

Texel Rate

The Radeon HD 7770 should be a small bit (about 9%) more effective at texture filtering than the GeForce 8800 GTX. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce 8800 GTX 36800 Mtexels/sec
Difference: 3200 (9%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7770 is the winner, but only just. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce 8800 GTX 13800 Mpixels/sec
Difference: 2200 (16%)

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 GTX

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 GTX Radeon HD 7770
Manufacturer nVidia AMD
Year Nov 2006 February 2012
Code Name G80 Cape Verde XT
Memory 768 MB 1024 MB
Core Speed 575 MHz 1000 MHz
Memory Speed 1800 MHz 4500 MHz
Power (Max TDP) 155 watts 80 watts
Bandwidth 86400 MB/sec 72000 MB/sec
Texel Rate 36800 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 640
Texture Mapping Units 64 40
Render Output Units 24 16
Bus Type GDDR3 GDDR5
Bus Width 384-bit 128-bit
Fab Process 90 nm 28 nm
Transistors 681 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8800 GTX

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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