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GeForce GTX 275 vs Radeon HD 6870

Intro

The GeForce GTX 275 features a GPU clock speed of 633 MHz, and the 896 MB of GDDR3 RAM runs at 1134 MHz through a 448-bit bus. It also is made up of 240 SPUs, 80 TAUs, and 28 ROPs.

Compare those specifications to the Radeon HD 6870, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this card. It features 1120 SPUs along with 56 TAUs and 32 ROPs.

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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

Theoretically, the Radeon HD 6870 should perform 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 will be a bit (more or less 0%) faster with regards to texture 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 using a high resolution is important to you, then the Radeon HD 6870 is the winner, by a large margin. (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

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.

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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends 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 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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