GeForce 8800 GTS (G80) 640MB vs Radeon HD 4830 1GB

Intro

The GeForce 8800 GTS (G80) 640MB has a core clock speed of 513 MHz and a GDDR3 memory frequency of 792 MHz. It also features a 320-bit memory bus, and makes use of a 90 nm design. It features 96 SPUs, 48 Texture Address Units, and 20 Raster Operation Units.

Compare those specifications to the Radeon HD 4830 1GB, which has a clock frequency of 575 MHz and a GDDR4 memory speed of 900 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, 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 4830 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce 8800 GTS (G80) 640MB	Radeon HD 4830 1GB
Manufacturer	nVidia	ATi
Year	Nov 2006 (640)	Oct 21, 2008
Code Name	G80	RV770 LE
Fab Process	90 nm	55 nm
Bus	PCIe x16	PCIe 2.0 x16
Memory	640 MB	1024 MB
Core Speed	513 MHz	575 MHz
Shader Speed	1188 MHz	(N/A) MHz
Memory Speed	792 MHz	900 MHz
Unified Shaders	96	640(128x5)
Texture Mapping Units	48	32
Render Output Units	20	16
Bus Type	GDDR3	GDDR4
Bus Width	320-bit	256-bit
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.0
Power (Max TDP)	143 watts	95 watts
Shader Model	4.0	4.1
Bandwidth	63360 MB/sec	57600 MB/sec
Texel Rate	24624 Mtexels/sec	18400 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	9200 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.