GeForce GTX 275 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 275 makes use of a 55 nm design. nVidia has clocked the core speed at 633 MHz. The GDDR3 memory runs at a speed of 1134 MHz on this card. It features 240 SPUs as well as 80 Texture Address Units and 28 ROPs.

Compare those specifications to the Radeon HD 4850 X2 512MB, which has a clock frequency of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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 4850 X2 512MB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 275	Radeon HD 4850 X2 512MB
Manufacturer	nVidia	ATi
Year	April 9, 2009	Nov 7, 2008
Code Name	G200b	R700
Fab Process	55 nm	55 nm
Bus	PCIe x16 2.0	PCIe 2.0 x16 (PCIe bridge)
Memory	896 MB	512 MB (x2)
Core Speed	633 MHz	625 MHz (x2)
Shader Speed	1404 MHz	(N/A) MHz (x2)
Memory Speed	1134 MHz	993 MHz (x2)
Unified Shaders	240	800(160x5) (x2)
Texture Mapping Units	80	40 (x2)
Render Output Units	28	16 (x2)
Bus Type	GDDR3	GDDR3
Bus Width	448-bit	256-bit (x2)
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.1	OpenGL 3.0
Power (Max TDP)	219 watts	250 watts
Shader Model	4.0	4.1
Bandwidth	127008 MB/sec	127104 MB/sec
Texel Rate	50640 Mtexels/sec	50000 Mtexels/sec
Pixel Rate	17724 Mpixels/sec	20000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.