Quote Originally Posted by minsc_tdp View Post
I will avoid IDCC but I did already try and duplicated the 279 to 280 MHz=Crash condition via the BIOS.

This may sound stupid but I'm a little unclear on how to do a complete power cycle immediately after changing voltages. There's no option to "save and shut down" only save and reboot basically. I don't want to force a power off in the middle of the reboot. So do I have to use Maintenance mode, since when I exit that, it tells me to immediately shut down?

I've kept the memory at ref 200 and mem 400 (=1:1), isn't that severely underclocked vs. the automatic mode of ref 266 and mem 667 (=4:5)? It makes no difference, 280 FSB = crash.

I'm still having trouble understanding how the ref freq relates to the FSB potential, for example, what's the safest ref and mem freq to keep the ram as underclocked as possible while ramping FSB?

133/200 is the lowest but that's a 2:3 ratio, so maybe that's not good.
266/667 is the default which is a 4:5 ratio.
333/400 is the lowest RAM ratio at 5:3 and I don't think I've tried this. Is *that* the lowest setting for the RAM?
What about timings? I've loosened them AS FAR AS THEY GO (6-5-5-18) for RAM rated 5-5-5-4.

Does the memory setting recommendation change as you go from 279 to 280 MHz? Then 300? Then 330? And so on? Or is the lowest ref and mem frequency the lowest no matter what the FSB is that?

I've been reading this thread for days. I'm on page 60. And it's still unclear how to set the memory to be the most stable while doing FSB clocking.

Does the CPU need to be broken in with Orthos for a few hours at 279 before it can go higher? It seems like a ton of people here are taking this stuff fresh out of the box and putting 1.45 volts and 380 FSB *average* with no problems, and here I am stuck in the 200's...

You can safely power off as soon as you press "Y" after F10 in the BIOS.

I think your problem is that your using a 200 MHz reference frequency. It makes the 975X MCH internal timings VERY tight. So even though 200/400 is a 1:1 ratio, the MCH is operating as though it's running at a relatively slow 800FSB.

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