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GeForce GTX 275 vs Radeon HD 6790

Intro

The GeForce GTX 275 comes with a GPU 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 features 240 Stream Processors, 80 Texture Address Units, and 28 ROPs.

Compare all of that to the Radeon HD 6790, which has clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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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

As far as performance goes, the Radeon HD 6790 should in theory be a small bit superior to 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 quite a bit (more or less 51%) better at AF than the Radeon HD 6790. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 275 is the winner, by a large margin. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 number is calculated by multiplying the total number of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to 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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