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GeForce GTX 275 vs Radeon HD 4850 X2 512MB

Intro

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

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

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 275 219 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 31 Watts (14%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 X2 512MB should theoretically be just a bit better than the GeForce GTX 275 in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 96 (0%)

Texel Rate

The GeForce GTX 275 is a little bit (more or less 1%) more effective at AF than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 640 (1%)

Pixel Rate

The Radeon HD 4850 X2 512MB should be a small bit (more or less 13%) better at FSAA than the GeForce GTX 275, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 2276 (13%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 275 Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year April 9, 2009 Nov 7, 2008
Code Name G200b R700
Memory 896 MB 512 MB (x2)
Core Speed 633 MHz 625 MHz (x2)
Memory Speed 2268 MHz 1986 MHz (x2)
Power (Max TDP) 219 watts 250 watts
Bandwidth 127008 MB/sec 127104 MB/sec
Texel Rate 50640 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 20000 Mpixels/sec
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)
Fab Process 55 nm 55 nm
Transistors 1400 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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