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GeForce GTX 275 vs Radeon HD 6790

Intro

The GeForce GTX 275 has clock speeds of 633 MHz on the GPU, and 1134 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs along with 80 Texture Address Units and 28 Rasterization Operator Units.

Compare all of that to the Radeon HD 6790, which comes with clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units 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

Theoretically speaking, the Radeon HD 6790 should be 6% faster than the GeForce GTX 275 overall, because of its higher data rate. (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%) faster with regards to AF 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 should be much (about 32%) more effective at FSAA than the Radeon HD 6790, and also should be able to handle 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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability 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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