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GeForce GTX 280 vs Radeon HD 6790

Intro

The GeForce GTX 280 comes with a clock speed of 602 MHz and a GDDR3 memory speed of 1107 MHz. It also uses a 512-bit bus, and uses a 65 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon HD 6790, which features GPU core speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also is made up of 800 Stream Processors, 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 280 236 Watts
Difference: 86 Watts (57%)

Memory Bandwidth

In theory, the GeForce GTX 280 should be 5% quicker than the Radeon HD 6790 overall, because of its higher data rate. (explain)

GeForce GTX 280 141696 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 7296 (5%)

Texel Rate

The GeForce GTX 280 should be a lot (approximately 43%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

GeForce GTX 280 48160 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 14560 (43%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 280 is the winner, by a large margin. (explain)

GeForce GTX 280 19264 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 5824 (43%)

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 280

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 280 Radeon HD 6790
Manufacturer nVidia AMD
Year June 17, 2008 April 2011
Code Name G200 Barts LE
Memory 1024 MB 1024 MB
Core Speed 602 MHz 840 MHz
Memory Speed 2214 MHz 4200 MHz
Power (Max TDP) 236 watts 150 watts
Bandwidth 141696 MB/sec 134400 MB/sec
Texel Rate 48160 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 19264 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 240 800
Texture Mapping Units 80 40
Render Output Units 32 16
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
Fab Process 65 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 maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units by the core clock 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 processed in a second.

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

Display Prices

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GeForce GTX 280

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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