GeForce GTX 275 vs Radeon HD 4890 2GB

Intro

The GeForce GTX 275 uses a 55 nm design. nVidia has clocked the core speed at 633 MHz. The GDDR3 RAM works at a speed of 1134 MHz on this specific model. It features 240 SPUs as well as 80 TAUs and 28 Rasterization Operator Units.

Compare those specs to the Radeon HD 4890 2GB, which has a clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised 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 4890 2GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 275	Radeon HD 4890 2GB
Manufacturer	nVidia	ATi
Year	April 9, 2009	Apr 2, 2009
Code Name	G200b	RV790 XT
Fab Process	55 nm	55 nm
Bus	PCIe x16 2.0	PCIe 2.0 x16
Memory	896 MB	2048 MB
Core Speed	633 MHz	1000 MHz
Shader Speed	1404 MHz	(N/A) MHz
Memory Speed	1134 MHz	975 MHz
Unified Shaders	240	800(160x5)
Texture Mapping Units	80	40
Render Output Units	28	16
Bus Type	GDDR3	GDDR5
Bus Width	448-bit	256-bit
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.1	OpenGL 3.0
Power (Max TDP)	219 watts	190 watts
Shader Model	4.0	4.1
Bandwidth	127008 MB/sec	124800 MB/sec
Texel Rate	50640 Mtexels/sec	40000 Mtexels/sec
Pixel Rate	17724 Mpixels/sec	16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.