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Radeon HD 3850 1GB vs Radeon HD 3850 X2

Intro

The Radeon HD 3850 1GB uses a 55 nm design. AMD has clocked the core speed at 668 MHz. The GDDR3 memory runs at a frequency of 828 MHz on this particular model. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 3850 X2, which features a GPU core clock speed of 668 MHz, and 512 MB of GDDR3 RAM set to run at 828 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3850 X2, in theory, should perform quite a bit faster than the Radeon HD 3850 1GB overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
Radeon HD 3850 1GB 52992 MB/sec
Difference: 52992 (100%)

Texel Rate

The Radeon HD 3850 X2 should be a lot (approximately 100%) more effective at texture filtering than the Radeon HD 3850 1GB. (explain)

Radeon HD 3850 X2 21376 Mtexels/sec
Radeon HD 3850 1GB 10688 Mtexels/sec
Difference: 10688 (100%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 3850 X2 is a better choice, by a large margin. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
Radeon HD 3850 1GB 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 1GB

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 1GB Radeon HD 3850 X2
Manufacturer AMD AMD
Year Nov 19, 2007 Apr 4, 2008
Code Name RV670 PRO RV670 PRO
Memory 1024 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 (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 3850 1GB

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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