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GeForce 8800 GTS (G80) 320MB vs Radeon HD 7770

Intro

The GeForce 8800 GTS (G80) 320MB uses a 90 nm design. nVidia has set the core frequency at 513 MHz. The GDDR3 memory is set to run at a speed of 792 MHz on this model. It features 96 SPUs as well as 48 Texture Address Units and 20 ROPs.

Compare those specifications to the Radeon HD 7770, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory works at a frequency of 1125 MHz on this specific model. It features 640 SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce 8800 GTS (G80) 320MB 143 Watts
Difference: 63 Watts (79%)

Memory Bandwidth

The Radeon HD 7770, in theory, should be a small bit faster than the GeForce 8800 GTS (G80) 320MB in general. (explain)

Radeon HD 7770 72000 MB/sec
GeForce 8800 GTS (G80) 320MB 63360 MB/sec
Difference: 8640 (14%)

Texel Rate

The Radeon HD 7770 should be a lot (approximately 62%) better at AF than the GeForce 8800 GTS (G80) 320MB. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Difference: 15376 (62%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7770 is the winner, by far. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce 8800 GTS (G80) 320MB 10260 Mpixels/sec
Difference: 5740 (56%)

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) 320MB

Amazon.com

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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 GTS (G80) 320MB Radeon HD 7770
Manufacturer nVidia AMD
Year Feb 2007 February 2012
Code Name G80 Cape Verde XT
Memory 320 MB 1024 MB
Core Speed 513 MHz 1000 MHz
Memory Speed 1584 MHz 4500 MHz
Power (Max TDP) 143 watts 80 watts
Bandwidth 63360 MB/sec 72000 MB/sec
Texel Rate 24624 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 96 640
Texture Mapping Units 48 40
Render Output Units 20 16
Bus Type GDDR3 GDDR5
Bus Width 320-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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 8800 GTS (G80) 320MB

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.

Comments

One Response to “GeForce 8800 GTS (G80) 320MB vs Radeon HD 7770”
moi says:

this 7770 is very good card and i offered sapphire hd 7770 OC model... when i get it it will be slaughter..

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