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Radeon HD 4790 vs Radeon HD 6790

Intro

The Radeon HD 4790 has a core clock frequency of 600 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6790, which comes with a GPU core clock speed of 840 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also features 800 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 6790 should in theory be a lot superior to the Radeon HD 4790 overall. (explain)

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

Texel Rate

The Radeon HD 6790 will be a lot (approximately 75%) faster with regards to AF 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 should be quite a bit (approximately 40%) more effective at FSAA than the Radeon HD 4790, and will be capable of handling higher screen resolutions better. (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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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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.

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