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+5 Rail too low?

D

DaLurker

[H]ard|Gawd
Joined
Sep 23, 2000
Messages
1,681
Right now I have a Asus A7N8X-E Deluxe with a Mobile 2500+ XP @ 12x195 @ 1.65 (board overvolts to about 1.7) and a Enermax 350W PSU. Now if I want to go any higher, say 12.5x195, I would have to up the voltage to say 1.7 or 1.75 (so it would over volt to 1.75 and 1.8 respectively). Now when I do that, the computer doesn't crash per say, but the whole system would just shut down, however the power light would stay on. I was thinking this is probably because my +5 rail is too low, but I just wanted some other opinions. My current voltages right now at 1.65V CPU voltage is:
+12V = 12.672
+5V = 4.892
+3.3 = 3.4

If I upt the CPU voltage, the +5 drops even more, but to waht, I'm not sure, usually by the time I Put load on it, it just crashes. Time for a new PSU?
 
4.89V = 2% off from 5V. The ATX spec allows 5%. You're fine.

(assuming that MBM, your BIOS or whatever is giving accurate readings)
 
3.25V and not 3.3v

Code: 
___3.25____ *  ____x____ = ~98.5
   3.3            100

Using good ol' cross multiplication we can see that you're within 1.5% there... not bad at all. Then again my math is horrible, feel free to tell me if I am completely wrong.

Edit:
Well yeah I did way too much work there, but it acheives the same result. :)
 
I had my 3.3V rail over 10% off before, and the system post, and ran... that is not your problem. However it ran poorly, and affected soundcard and videocard. I think you might need to up the voltage even more, only other complication in overclocking really is RAM which multipliers don't do anything to. My FX requires 1.5V for 2200, 1.625V for 2400, and over 1.7V for 2500... If you notice the voltage to clock ratio changes to the worse the higher you get.
 
from what ive heard 98% of the motherboards out there dont use the 5volt line for squat, but the a7n8x uses it like its going out of style, so on that motherboard i would definitly make sure that your powersupply has a real strong 5volt line


just my 2 cents
 
Surrealistic said:
from what ive heard 98% of the motherboards out there dont use the 5volt line for squat, but the a7n8x uses it like its going out of style, so on that motherboard i would definitly make sure that your powersupply has a real strong 5volt line


just my 2 cents
Click to expand...
Lots of things use +5V... almost all PCI cards, parallel IDE, LPC stuff (eg your BIOS chip), parallel ports, USB... and things like DIMM voltage supplies are normally stepped down from +5V.
 
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