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GeForce GTX 275 vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 275 features a GPU core clock 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 is comprised of 240 Stream Processors, 80 Texture Address Units, and 28 Raster Operation Units.

Compare all of that to the Radeon HD 4850 X2 1GB, which features GPU clock speed of 625 MHz, and 1024 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 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 1GB 250 Watts
Difference: 31 Watts (14%)

Memory Bandwidth

The Radeon HD 4850 X2 1GB should theoretically perform a little bit faster than the GeForce GTX 275 in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 96 (0%)

Texel Rate

The GeForce GTX 275 should be just a bit (about 1%) better at anisotropic filtering than the Radeon HD 4850 X2 1GB. (explain)

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

Pixel Rate

The Radeon HD 4850 X2 1GB should be a bit (approximately 13%) more effective at anti-aliasing than the GeForce GTX 275, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB 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 1GB

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 1GB
Manufacturer nVidia AMD
Year April 9, 2009 Nov 7, 2008
Code Name G200b R700
Memory 896 MB 1024 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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability 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 1GB

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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