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

Intro

The GeForce 8800 GTS (G80) 320MB has a core clock frequency of 513 MHz and a GDDR3 memory speed of 792 MHz. It also features a 320-bit bus, and makes use of a 90 nm design. It features 96 SPUs, 48 Texture Address Units, and 20 Raster Operation Units.

Compare that to the Radeon HD 7770, which has a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce 8800 GTS (G80) 320MB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 7770 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce 8800 GTS (G80) 320MB	Radeon HD 7770
Manufacturer	nVidia	ATi
Year	Feb 2007	February 2012
Code Name	G80	Cape Verde XT
Fab Process	90 nm	28 nm
Bus	PCIe x16	PCIe 3.0 x16
Memory	320 MB	1024 MB
Core Speed	513 MHz	1000 MHz
Shader Speed	1188 MHz	(N/A) MHz
Memory Speed	792 MHz	1125 MHz
Unified Shaders	96	640
Texture Mapping Units	48	40
Render Output Units	20	16
Bus Type	GDDR3	GDDR5
Bus Width	320-bit	128-bit
DirectX Version	DirectX 10	DirectX 11.1
OpenGL Version	OpenGL 3.0	OpenGL 4.2
Power (Max TDP)	143 watts	80 watts
Shader Model	4.0	5.0
Bandwidth	63360 MB/sec	72000 MB/sec
Texel Rate	24624 Mtexels/sec	40000 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.