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Radeon HD 4850 X2 1GB vs Radeon HD 6790

Intro

The Radeon HD 4850 X2 1GB comes with a GPU clock speed of 625 MHz, and the 1024 MB of GDDR3 memory runs at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 6790, which comes with 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 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should perform a little bit faster than the Radeon HD 4850 X2 1GB overall. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 7296 (6%)

Texel Rate

The Radeon HD 4850 X2 1GB is quite a bit (more or less 49%) faster with regards to AF than the Radeon HD 6790. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 16400 (49%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4850 X2 1GB is a better choice, by far. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 6560 (49%)

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 4850 X2 1GB

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 4850 X2 1GB Radeon HD 6790
Manufacturer AMD AMD
Year Nov 7, 2008 April 2011
Code Name R700 Barts LE
Memory 1024 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 840 MHz
Memory Speed 1986 MHz (x2) 4200 MHz
Power (Max TDP) 250 watts 150 watts
Bandwidth 127104 MB/sec 134400 MB/sec
Texel Rate 50000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 20000 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 GDDR3 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 (in units of MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 1GB

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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