Quick vCore question

D

dbaldus

Gawd
Joined
Jul 12, 2005
Messages
563
The BIOS (rev 1017) on my A8V Deluxe automatically sets the voltages for me. It just dawned on me that perhaps the reason my idle/load temps are higher than most people's overclocked temps (I'm running stock speeds) is because my voltage is automatically set higher than other people's. Is it good practice to set the vCore yourself in the BIOS? My ASUS Probe says the voltage is at 4.7-4.9V most of the time from what I remember for stock speeds on my 3500+ (see sig for rest of rig). For running stock speed, what would be a good voltage to set it at? Is there any danger in "undervolting" my core, or will I just not be able to run at 2.2Ghz (stock) if I'm not getting enough voltage?

By the way, my idle/load temps are 39C/50C stock speeds on EVERYTHING but using a Scythe Ninja with 4 120mm case fans. This is why I think I may have a problem.
 
I sure hope to god your Vcore is 1.47-1.49 not 4.7 to 4.9 haha. You'd have a smouldering pile of ash if it was.

Um, try setting it to 1.35v for your stock setting and test if it's stable. If you're stable, drop it in 0.025v steps until you can't prime for over 10hrs or so. Undervolting is totally safe, it just causes instability if your processor isn't getting enough juice.
 
What's the max voltage I would want to go on a 3500+, if I was overclocking?

And yeah... 1.47-1.49 :p
 
90nm I believe. I've had it for about 2 years though... how would I tell for sure? Socket 939 if that makes a difference.

Also, it boots at 1.35 volts... when I actually went into the BIOS it said 1.52 volts... so maybe thats why I was so hot.

How exactly will I tell if its "stable" at this voltage - just run prime95 for awhile or will it not even boot if the voltage is too low?

Thanks
 
to test for the vcore prime95 is your best bet and for vcore if it is 90nm I would be willing to throw 1.6v at it and probably no more for daily oc'ing. If 130nm you should be safe at 1.7v Now the quickest way to check which core it is and 90nm 130nm is get cpuz open it up and just read what it says.

http://www.cpuid.com/cpuz.php
 
Hmm...

Well, I can run stock settings at 1.35 volts, drops my temps to 35/41. But as soon as I crank up the FSB to 220 (2.4ghz), my system won't restart. If I give it more voltage (up to 1.40 volts), it will continuously get to the Windows load point and then reboot. My system would do that all day if I didn't go back into the BIOS to change it. The only way I've been able to get an overclock is by setting the "AI Overclock" feature on my ASUS A8V to "overclock 10%", which also boosts the voltage automatically and cannot be adjusted manually while using that setting. In other words, I get up to like 52 idle, 68 load because the voltage is so high.

Would I be constantly rebooting because my vcore is set too low? Seems strange to me that overclocking to 2.4, or even 2.3 (220 and 210mhz fsb, respectively) and increasing the voltage from 1.35 to 1.40 won't do it, but maybe I'm just clueless. Also, when running at 2.3 ghz at 1.40 volts, it will boot up but after a few hours I get some instability (strange graphics, bad driver messages, nothing works, etc. in Windows). Is that because of setting the vcore too low also?

What should I try? How much should I have to increase the voltage to run 220 FSB anyway?
 
yes. low voltage on an oc can cause instability.
solution= give more juice.
if ur concern about temps, then get better cooling or stay at an acceptable temp.
 
What is a typical voltage for overclocking from 2.2 to 2.4 ghz (just moving the FSB up 20mhz)? I'd just like to know if I'm doing something wrong when I finally get my vcore adjusted so it is stable. 1.45? 1.5? 1.6?
 
it really depends on the chip. i had a 3200+ venice that needed 1.5v for 2.3ghz, but i'm using a 3400+ sempron now that can do 2.3ghz with 1.15v ;)
 
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