GeForce 8800 GTS (G80) 640MB vs Radeon HD 4770

Intro

The GeForce 8800 GTS (G80) 640MB uses a 90 nm design. nVidia has set the core speed at 513 MHz. The GDDR3 RAM runs at a frequency of 792 MHz on this specific model. It features 96 SPUs as well as 48 TAUs and 20 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4770, which has core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs as well as 32 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) 640MB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 4770 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce 8800 GTS (G80) 640MB	Radeon HD 4770
Manufacturer	nVidia	ATi
Year	Nov 2006 (640)	Apr 28, 2009
Code Name	G80	RV740
Fab Process	90 nm	40 nm
Bus	PCIe x16	PCIe 2.0 x16
Memory	640 MB	512 MB
Core Speed	513 MHz	750 MHz
Shader Speed	1188 MHz	(N/A) MHz
Memory Speed	792 MHz	800 MHz
Unified Shaders	96	640(128x5)
Texture Mapping Units	48	32
Render Output Units	20	16
Bus Type	GDDR3	GDDR5
Bus Width	320-bit	128-bit
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.0
Power (Max TDP)	143 watts	80 watts
Shader Model	4.0	4.1
Bandwidth	63360 MB/sec	51200 MB/sec
Texel Rate	24624 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	12000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. 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 output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.