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GeForce GTX 275 vs Radeon HD 6870

Intro

The GeForce GTX 275 has a clock speed of 633 MHz and a GDDR3 memory frequency of 1134 MHz. It also uses a 448-bit bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 28 Raster Operation Units.

Compare all of that to the Radeon HD 6870, which comes with a GPU core clock speed of 900 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also features 1120 Stream Processors, 56 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
GeForce GTX 275 219 Watts
Difference: 68 Watts (45%)

Memory Bandwidth

The Radeon HD 6870, in theory, should perform just a bit faster than the GeForce GTX 275 in general. (explain)

Radeon HD 6870 134400 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 7392 (6%)

Texel Rate

The GeForce GTX 275 should be just a bit (more or less 0%) faster with regards to anisotropic filtering than the Radeon HD 6870. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 240 (0%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6870 is superior to the GeForce GTX 275, and very much so. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 11076 (62%)

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.

Price Comparison

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GeForce GTX 275

Amazon.com

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Radeon HD 6870

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 6870
Manufacturer nVidia AMD
Year April 9, 2009 October 2010
Code Name G200b Barts XT
Memory 896 MB 1024 MB
Core Speed 633 MHz 900 MHz
Memory Speed 2268 MHz 4200 MHz
Power (Max TDP) 219 watts 151 watts
Bandwidth 127008 MB/sec 134400 MB/sec
Texel Rate 50640 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 240 1120
Texture Mapping Units 80 56
Render Output Units 28 32
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 1400 million 1700 million
Bus PCIe x16 2.0 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of 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 better 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 can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory 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 6870

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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