GeForce GTX 275 vs Radeon HD 4870 1GB

Intro

The GeForce GTX 275 has a GPU core speed of 633 MHz, and the 896 MB of GDDR3 memory is set to run at 1134 MHz through a 448-bit bus. It also features 240 SPUs, 80 Texture Address Units, and 28 Raster Operation Units.

Compare those specifications to the Radeon HD 4870 1GB, which uses a 55 nm design. ATi has clocked the core frequency at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator 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 4870 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 275	Radeon HD 4870 1GB
Manufacturer	nVidia	ATi
Year	April 9, 2009	Jun 25, 2008
Code Name	G200b	RV770 XT
Fab Process	55 nm	55 nm
Bus	PCIe x16 2.0	PCIe 2.0 x16
Memory	896 MB	1024 MB
Core Speed	633 MHz	750 MHz
Shader Speed	1404 MHz	(N/A) MHz
Memory Speed	1134 MHz	900 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	150 watts
Shader Model	4.0	4.1
Bandwidth	127008 MB/sec	115200 MB/sec
Texel Rate	50640 Mtexels/sec	30000 Mtexels/sec
Pixel Rate	17724 Mpixels/sec	12000 Mpixels/sec

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.