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Radeon HD 4790 vs Radeon HD 6790

Intro

The Radeon HD 4790 features a GPU core speed of 600 MHz, and the 512 MB of GDDR5 RAM is set to run at 800 MHz through a 256-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 6790, which uses a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 memory works at a speed of 1050 MHz on this model. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 6790 should perform a lot faster than the Radeon HD 4790 in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 32000 (31%)

Texel Rate

The Radeon HD 6790 will be quite a bit (about 75%) faster with regards to anisotropic filtering than the Radeon HD 4790. (explain)

Radeon HD 6790 33600 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 14400 (75%)

Pixel Rate

The Radeon HD 6790 will be a lot (more or less 40%) faster with regards to anti-aliasing than the Radeon HD 4790, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6790 13440 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 3840 (40%)

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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Radeon HD 4790

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 Radeon HD 4790 Radeon HD 6790
Manufacturer AMD AMD
Year 2009 April 2011
Code Name RV790 Barts LE
Memory 512 MB 1024 MB
Core Speed 600 MHz 840 MHz
Memory Speed 3200 MHz 4200 MHz
Power (Max TDP) (Unknown) watts 150 watts
Bandwidth 102400 MB/sec 134400 MB/sec
Texel Rate 19200 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 640(128x5) 800
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 1700 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's 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 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 is worked out by multiplying the total number of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4790

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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