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GeForce GTX 275 vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 275 features core speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs along with 80 Texture Address Units and 28 ROPs.

Compare that to the Radeon HD 4850 X2 512MB, which features GPU core speed of 625 MHz, and 512 MB of GDDR3 memory running at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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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

Theoretically speaking, the Radeon HD 4850 X2 512MB should be 0% quicker than the GeForce GTX 275 in general, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GTX 275 will be a small bit (about 1%) better at anisotropic filtering 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 will be a bit (about 13%) better at full screen anti-aliasing than the GeForce GTX 275, and also will be able to handle higher screen 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: Bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling 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 could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of 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.

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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