MVDDQ and VDDCI info? X1900

[Repoman]

Anyone have any information for me on these two voltages? What do they do? If set too low, VDDCI will kill my video output and force a reset. But if raised does it result in higher clocks? How far is safe..

At 778Mhz, 1.9/1.9v for the two mem voltages, I get artifacts. I raise them to 1.95/1.95 and it works.. but it also works at 1.95/1.85, and even lower for MVDDQ. Is there a benefit to running it higher?

I will test them all myself obviously, but I figure maybe someone has figured something out to help with our OC's :)

Thanks to all the veteran x1900 owners

edit: down to the minimum 1.785 on mvddq, fine for a few passes of 3d01 nature

Any comments?

[irev210]

http://www.xtremesystems.org/forums/showthread.php?t=87890

good place to start.

[ahmad]

VDDQ is mem buffers. Its rarely a good idea to increase it and just results in more heat being generated. That said there is a lower bound you must not pass.

1.95v works best for me.

[Repoman]

What's the lower bound? I can have it as low as 1.785 (minimum allowed) and it still works fine. Is this unsafe?

And yeah I was planning on reading through that thread eventually, haha

[ahmad]

Depends on what clock speeds you want to run at. For stock I think 1.80v sounds about right. But it will help with RAM stability to increase it in appropriate amounts for higher RAM speeds.