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Radeon HD 4850 2GB vs Radeon HD 4850 X2 1GB

Intro

The Radeon HD 4850 2GB has a core clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 4850 X2 1GB, which has GPU clock speed of 625 MHz, and 1024 MB of GDDR3 RAM set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB 110 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 140 Watts (127%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB should perform much faster than the Radeon HD 4850 2GB overall. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 63552 (100%)

Texel Rate

The Radeon HD 4850 X2 1GB will be a lot (about 100%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 25000 (100%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4850 X2 1GB is the winner, and very much so. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 10000 (100%)

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 2GB

Amazon.com

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Radeon HD 4850 X2 1GB

Amazon.com

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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 2GB Radeon HD 4850 X2 1GB
Manufacturer AMD AMD
Year Jun 25, 2008 Nov 7, 2008
Code Name RV770 PRO R700
Memory 2048 MB 1024 MB (x2)
Core Speed 625 MHz 625 MHz (x2)
Memory Speed 1986 MHz 1986 MHz (x2)
Power (Max TDP) 110 watts 250 watts
Bandwidth 63552 MB/sec 127104 MB/sec
Texel Rate 25000 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5) (x2)
Texture Mapping Units 40 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR4 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 956 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 can be 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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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