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In order to get my XP2500 running above 2.4Gig i need to set Vcore to 1.9-2.0V.
When i set Vcore to 1.93V and monitor with Winbond Hardware Doctor, i see the Vcore fluctuate somewhere between 1.87 and 1.9V. :rolleyes:
Also 12V fluctuate between 11.62 and 11.68V.,3.3V and 5V are fine.
This happens during idle and gets even stronger during load.
I have heatsinks on my mosfets alreadyand have a nice airflow in my case with 3 intake 80mm fans and 2 outtake 80mm fans but my PSU is only a Qtec 550W.
I suspect my PSU is the culprit, can anyone confirm?
IamAnoobieCheez
08-06-2003, 01:29 PM
Originally posted by Zeus
In order to get my XP2500 running above 2.4Gig i need to set Vcore to 1.9-2.0V.
When i set Vcore to 1.93V and monitor with Winbond Hardware Doctor, i see the Vcore fluctuate somewhere between 1.87 and 1.9V. :rolleyes:
Also 12V fluctuate between 11.62 and 11.68V.,3.3V and 5V are fine.
This happens during idle and gets even stronger during load.
I have heatsinks on my mosfets alreadyand have a nice airflow in my case with 3 intake 80mm fans and 2 outtake 80mm fans but my PSU is only a Qtec 550W.
I suspect my PSU is the culprit, can anyone confirm?
welcome to the abit boards. they are good at undervoltage and voltage fluctuation. You getting .06v lower is pretty good actually. That is more... normal for these boards. You, try running prime95 with the voltage monitor turned on. See how much it'll fluctuate, haha lol.. depending on the moodieness of the abit nf7 boards, one may fluctuate more than the others regardless of what PSUs you have. Mine fluctuates as much as .11~ .12v tops below set vcore for prime95 stability testing.
The cooling will help remedy your problem. If the cooling power is enough, it can override your unstability due to vcore fluctuations/spikes. of course, with a high end psu + pot adjustments will help, but will still fluctuate enough that it doesnt' make much difference.
You can take a little 300watt psu and run it over 2.8ghz@ high vcore, if, you apply supercooling. I run nearly 2.8ghz@ 1.98v on my tbred system + 80watt peltier(8.5A) for the video card, all on a single psu, 350watt.
The best solution for you is either set your CPU clockspeed to a well within safe range, or leave it where you are at and apply more powerful cooling.
I have the same problem with my epox. 2.2v in bios only shows 2.14-2.18v but mostly on the low side. i couldnt ran stable @ 2.5ghz untill i chilled to 20c or cooler. my asus 7v8x was even worse.
Does it make sense to put some sinks on the vregs that are close to the mosfets?
They get hot, but nowhere near as hot as the fets themselfs.
Originally posted by Zeus
Does it make sense to put some sinks on the vregs that are close to the mosfets?
They get hot, but nowhere near as hot as the fets themselfs.
Some people have, especially on the 8RDA+ boards. If your worried about anything, sink it! :D
Craig
DarKcyde
08-07-2003, 03:40 PM
Mine does the same. Set to 2.1V it bounces from 2.0-2.5 while Prime95'ing, 2.3-2.8 idle. I dont have sinks on my mosfets yet, but I got a 80mm smartfan blowing straight down on em. I also noticed the vregs get stinkin hot at this voltage. Maybe its just cuz I stop the airflow when I put my finger on em, but they hurt if u leave your finger there too long. Any suggestions for sinking those vregs? Those things are tiny!
A quality PSU will prolly help the stability, but simply adding more voltage by adjusting pots wont do much. It'll still fluctuate the same, according to what the psu and mobo are capable of, stability-wise.
Thank god it's not just me. :)
I think this fluctuation is limiting my OC in a big way, these Barton definitly like some voltage, it seems the higher the voltage the more it fluctuates. :mad:
Will increasing Vio (3.3V) help maybe?
IamAnoobieCheez
08-08-2003, 05:08 PM
Originally posted by Zeus
Thank god it's not just me. :)
it seems the higher the voltage the more it fluctuates. :mad:
yes..
Will increasing Vio (3.3V) help maybe?
that would make it even worse.
lower the rails I set it to(Pot adjustments) for the +3.3V/+5V, the better it gets.
Increasing the rails is not = to better.
MrLavender
08-09-2003, 06:23 AM
Originally posted by Zeus
Thank god it's not just me. :)
I think this fluctuation is limiting my OC in a big way, these Barton definitly like some voltage, it seems the higher the voltage the more it fluctuates. :mad:
Will increasing Vio (3.3V) help maybe? More voltage = hotter mosfets/vreg = more fluctuation.
Try pointing a fan directly at the mosfets and see if it makes any difference.