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Radeon HD 4850 2GB vs Radeon HD 4850 X2 512MB

Intro

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

Compare those specs to the Radeon HD 4850 X2 512MB, which features GPU clock speed of 625 MHz, and 512 MB of GDDR3 RAM running at 993 MHz through a 256-bit bus. It also features 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 512MB 250 Watts
Difference: 140 Watts (127%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 512MB should in theory be much superior to the Radeon HD 4850 2GB in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 63552 (100%)

Texel Rate

The Radeon HD 4850 X2 512MB is much (more or less 100%) more effective at anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 25000 (100%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be a lot (about 100%) better at FSAA than the Radeon HD 4850 2GB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB 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

Check prices at:

Radeon HD 4850 X2 512MB

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 2GB Radeon HD 4850 X2 512MB
Manufacturer AMD AMD
Year Jun 25, 2008 Nov 7, 2008
Code Name RV770 PRO R700
Memory 2048 MB 512 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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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