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Quad channel Expand / Collapse
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Posted 23/02/2008 08:50:31


Pentium

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When is quad channel coming to the tesk top, when will quad channel be as powerful as dual channel on a like for like basis.

Im no spin doctor but lets just say as least 4 times as powerfull in real terms.

Oh, and of course be @ least DDR 3.

The Lost Artifact is not lost. Why? Because I have it.

Post #267338
Posted 23/02/2008 09:35:21


Pentium

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I thought it was here, with quad cores.
Isn't it basically QDR with them, not DDR?

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Post #267342
Posted 23/02/2008 13:39:15


Octo-core Atom @ 233GHz (ES)

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I think you're getting mixed up a bit. QDR is quadruple data-rate, where each bus cycle carries four data bits, effectively increasing the raw hertz speed by a factor of 4 (so a 200MHz bus effectively becomes 800MHz, as seen on (some) Intel CPUs). Quad-channel refers not to cycles but to bus width -- how many 64-bit memory buses can be run simultaneously. Currently the standard is for dual-channel -- two 64-bit buses (128-bit) running side-by-side (theoretically doubling memory bandwidth). Quad-channel will mean four 64-bit buses running side-by-side (256-bit).

Also, the number of cores on a CPU has no bearing on the data rate of the bus attached to it or on the width of the memory bus. A quad-core CPU could very easily be used with a single-rate FSB and a single-channel memory controller.


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Post #267371
Posted 23/02/2008 20:07:37


Pentium

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Ah, thanks Jason

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Post #267444
Posted 23/02/2008 21:28:58


Pentium

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There is one quad channel desk top board @ the moment and intel have thrown loads and loads of dead money into it NASA style.

trouble is the quad channel memory is straight from a srever and so features oodles of error correction properties and so in actual fact is slower than DDR.

The Lost Artifact is not lost. Why? Because I have it.

Post #267465
Posted 23/02/2008 22:31:11


Pentium

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DDR2 running at 1066MHz in dual-channel on tight timings already provides more memory bandwidth than a quad-core C2D can use. We don't even need DDR3 yet, let alone quad-channel.

Cheers, Slipstreem.




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Post #267483
Posted 23/02/2008 23:16:31


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A quad-core CPU could very easily be used with a single-rate FSB and a single-channel memory controller.


I have built such a single channel memory controller unit using the Biostar TF7150U-M7 and 4GB of DDR2 800 CL4.
Primarily used by the customer for encoding home videos and manipulating raw images from his Canon SLR.

Goes like stink
The Sony Vegas Movie Studio Platinum uses all 4 cores and 4Gb ram helps Photoshop Elements along.


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Post #267501
Posted 24/02/2008 10:46:01


Pentium

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There is nothing wrong with oodles of band width. Its like hydrolics you can have a low pressure system or a high pressure system. Inherently the high pressure system will fail.

Getting the balance right is the trick. I think we will need quad channel within the next 2 years. DDR3 may not be able to bust dual channel band width as it evolves to max potential but, I'm confident DDR4 will.

Of course alot has to do with todays software being multi thread and maxing out available cores.

The Lost Artifact is not lost. Why? Because I have it.

Post #267550