GeForce GTX 275 vs Radeon HD 6850

Intro

The GeForce GTX 275 features a core clock frequency of 633 MHz and a GDDR3 memory speed of 1134 MHz. It also features a 448-bit memory bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 TAUs, and 28 ROPs.

Compare those specifications to the Radeon HD 6850, which features a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 Texture Address Units, and 32 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 GTX 275 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 6850 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 275	Radeon HD 6850
Manufacturer	nVidia	ATi
Year	April 9, 2009	October 2010
Code Name	G200b	Barts Pro
Fab Process	55 nm	40 nm
Bus	PCIe x16 2.0	PCIe x16
Memory	896 MB	1024 MB
Core Speed	633 MHz	775 MHz
Shader Speed	1404 MHz	(N/A) MHz
Memory Speed	1134 MHz	1000 MHz
Unified Shaders	240	960
Texture Mapping Units	80	48
Render Output Units	28	32
Bus Type	GDDR3	GDDR5
Bus Width	448-bit	256-bit
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.1	OpenGL 4.1
Power (Max TDP)	219 watts	127 watts
Shader Model	4.0	5.0
Bandwidth	127008 MB/sec	128000 MB/sec
Texel Rate	50640 Mtexels/sec	37200 Mtexels/sec
Pixel Rate	17724 Mpixels/sec	24800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are applied per second. This figure is worked out by multiplying the total amount of texture units by the core 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 one second.

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