Originally Posted by kaseki
[Sorry with respect to responsiveness. I have a lot of yard work to do today. At the moment, I'm having a late lunch.]
Whoa! Let me make sure you and I are truly communicating. First, when I corrected my process last night, I changed CLDO and then F10'd to reboot and then shut the PC down (PSU still powered). I may have shut down different ways depending on whether I captured the BIOS or had to wait for the OS banner page. Then I started the PC up again for the next training or stability test. Is that what you mean by reset, or something else?
I also better ask: Given a reset to get the intended CLDO, does every start after that have to involve a reset to keep that CLDO value? Is there some non-reset related reversion to 950 mV? If so, it would be even more tedious to adjust timing values.
"if your settings are right, then you will be able to boot with any CLDO value" This would imply that CLDO is not (or no longer) being used.
By reset I mean forcing the PC to shutdown after hitting F10 and holding the Reset button until the PC powers on by itself. Forced shutdown from the BIOS can be done by changing DRAM boot voltage by 0.005V up or down.
The way to change CLDO:
- Change CLDO_VDDP value
- Change DRAM boot voltage a little
- Hit F10, to save and exit
- The PC will shut down, here you can hold the Reset button down on the PC's front panel
- Release the Reset button when the PC powers on by itself
This will trigger the new CLDO_VDDP value. The PC will remember the CLDO_VDDP voltage you have set in the BIOS, as long as it passes boot/memory training. If it does not pass training and your settings at AMD CBS are gone, so is your CLDO_VDDP and you are back to 950mV.
I hope this clears things up, and you can notice it by when checking stability, as I showed in the screenshots.
Originally Posted by finalheaven
Hmm, I didn't think CLDO mattered for stability. Figured it was only for memory holes.
Not what I found out. I can boot at CLDO_VDDP values from 628mV (the lowest I tried) to 1020mV. As long as your settings are right then you will be able to choose which value to use, the difference will be the stability of the system.
My system now, as I write, is running at CLDO_VDDP = 628mV. I have tuned it to run at this voltage, and have posted the results in an earlier post. My CPU needs 868mV to run without tuning, and I suspect the R7 CPU's can run at 625mV - 630mV without tuning, but I cannot confirm this because I don't have an R7 to test. R7 is better silicon than R5, this is why I think it does not need so high CLDO voltage as 950mV which it is when set to AUTO.Edited by Ramad - 7/23/17 at 12:54pm