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Radeon HD 3850 256MB vs Radeon HD 3850 X2

Intro

The Radeon HD 3850 256MB features a GPU core clock speed of 668 MHz, and the 256 MB of GDDR3 RAM runs at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 3850 X2, which comes with core speeds of 668 MHz on the GPU, and 828 MHz on the 512 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 X2 should in theory be a lot superior to the Radeon HD 3850 256MB in general. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 52992 (100%)

Texel Rate

The Radeon HD 3850 X2 will be quite a bit (approximately 100%) better at AF than the Radeon HD 3850 256MB. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 10688 (100%)

Pixel Rate

The Radeon HD 3850 X2 should be a lot (approximately 100%) more effective at FSAA than the Radeon HD 3850 256MB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 10688 (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 3850 256MB

Amazon.com

Check prices at:

Radeon HD 3850 X2

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 3850 256MB Radeon HD 3850 X2
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 4, 2008
Code Name RV670 PRO RV670 PRO
Memory 256 MB 512 MB (x2)
Core Speed 668 MHz 668 MHz (x2)
Memory Speed 1656 MHz 1656 MHz (x2)
Power (Max TDP) 75 watts (Unknown) watts
Bandwidth 52992 MB/sec 105984 MB/sec
Texel Rate 10688 Mtexels/sec 21376 Mtexels/sec
Pixel Rate 10688 Mpixels/sec 21376 Mpixels/sec
Unified Shaders 320(64x5) 320(64x5) (x2)
Texture Mapping Units 16 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16/AGP 8x PCIe 2.0 x16/(internal PCIe 1.1 x16)
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 information (measured in MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can 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 Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 3850 256MB

Amazon.com

Check prices at:

Radeon HD 3850 X2

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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