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GeForce GTX 275 vs Radeon HD 6790

Intro

The GeForce GTX 275 uses a 55 nm design. nVidia has clocked the core frequency at 633 MHz. The GDDR3 RAM works at a speed of 1134 MHz on this particular card. It features 240 SPUs as well as 80 TAUs and 28 Rasterization Operator Units.

Compare that to the Radeon HD 6790, which uses a 40 nm design. AMD has clocked the core frequency at 840 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this specific model. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
GeForce GTX 275 219 Watts
Difference: 69 Watts (46%)

Memory Bandwidth

The Radeon HD 6790 should in theory perform a little bit faster than the GeForce GTX 275 overall. (explain)

Radeon HD 6790 134400 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 7392 (6%)

Texel Rate

The GeForce GTX 275 will be much (about 51%) better at anisotropic filtering than the Radeon HD 6790. (explain)

GeForce GTX 275 50640 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 17040 (51%)

Pixel Rate

The GeForce GTX 275 is quite a bit (approximately 32%) faster with regards to anti-aliasing than the Radeon HD 6790, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 275 17724 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 4284 (32%)

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 6790

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 6790
Manufacturer nVidia AMD
Year April 9, 2009 April 2011
Code Name G200b Barts LE
Memory 896 MB 1024 MB
Core Speed 633 MHz 840 MHz
Memory Speed 2268 MHz 4200 MHz
Power (Max TDP) 219 watts 150 watts
Bandwidth 127008 MB/sec 134400 MB/sec
Texel Rate 50640 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 17724 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 240 800
Texture Mapping Units 80 40
Render Output Units 28 16
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 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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

Hide Prices

GeForce GTX 275

Amazon.com

Check prices at:

Radeon HD 6790

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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