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Radeon HD 4870 X2 vs Radeon HD 6790

Intro

The Radeon HD 4870 X2 makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a speed of 900 MHz on this card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 6790, which features core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 4870 X2 350 Watts
Difference: 200 Watts (133%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should theoretically be much superior to the Radeon HD 6790 overall. (explain)

Radeon HD 4870 X2 230400 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 96000 (71%)

Texel Rate

The Radeon HD 4870 X2 will be much (more or less 79%) better at texture filtering than the Radeon HD 6790. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 26400 (79%)

Pixel Rate

The Radeon HD 4870 X2 will be quite a bit (more or less 79%) faster with regards to FSAA than the Radeon HD 6790, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 10560 (79%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4870 X2

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 4870 X2 Radeon HD 6790
Manufacturer AMD AMD
Year Aug 12, 2008 April 2011
Code Name R700 Barts LE
Memory 1024 MB (x2) 1024 MB
Core Speed 750 MHz (x2) 840 MHz
Memory Speed 3600 MHz (x2) 4200 MHz
Power (Max TDP) 350 watts 150 watts
Bandwidth 230400 MB/sec 134400 MB/sec
Texel Rate 60000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 24000 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core 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 rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4870 X2

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.

Comments

One Response to “Radeon HD 4870 X2 vs Radeon HD 6790”
[Vând/Schimb] Ati HD4870x2 ~ 400 ron says:

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