is the 5v rail in my shuttle limiting my OC?

[scottatwittenberg]

i am just curious.. my 5v rail is 19A ( http://www.imagelink.org/id11145.jpg )
i can hit about 2.55ghz and then hit a wall.. do you think it could be my 5v rail running out of juice? because i read that the 5v rail limiting factor with socket A overclocks and shit.... i know it won't make any difference, i won't put a new psu in this thing, and i am still happy with a 50% OC.. but i am just trying to satisfy my curiousity.. (that is not spelled right)

http://www.imagelink.org/id3634.gif

i made that chart a long time ago.. i really think i could hit 2.6 if not more with 2.0v.. but it just kinda took a shit on me after about 1.8v..

discussion starts here

(btw... i have been running this at 2.0 ghz and 1.472v for the last few weeks.. because i am too lazy to restart... (longer story, i went to europe for 5 weeks, and i set it up so my mom could definitely start it with no problems if she had to.. and never changed since i got back)

discussion really starts here:

editied so i wouldn't steal newegg's bandwidth, i did however steal their picture with is probably technically copyrighted and shit... i guess i could take my shuttle apart and take my own pic.. but seriously i am too lazy / content / apathetic to take it apart to even up the fsb and the multi (and vcore too) for more perfomance.. so i won't take it apart for a damn picture....

[scottatwittenberg]

bump to see what people think..

[zer0signal667]

As far as your experimentation goes... that's an interesting correlation between freq. and voltage. What kind of relationships are those two extrapolated lines (parabolic, exponential, etc.) and did you obtain an R^2 value for the fit?
Have you tested your 5V line with a voltmeter? See how much it fluctuates under idle/load conditions. If not much, I would venture to say that getting a new power supply is not going to help you much, if at all. As I'm sure you're aware, there is a point where no matter how much more voltage you supply, you're not going to be able to increase frequency. If you think the power is the problem, and you have some balls and electronics skills, you could try adding additional capacitors to your motherboard.

[scottatwittenberg]

i am thinking more simplisticly.. i just heard a few places that the socket A platform really eats at the 5v rail, especially when overclocking.. and i know my shuttle psu is a 250 watt.. and that a lot of people are running 400 and 500+ watt psus.. which i am sure supply almost twice the amperage at 5v..

and those lines.. they were put in after the X's... i just kinda guessed them.. no math was used.. i can't even remember if i made the green or grey one first... but i thought the 2nd one was more accurate...

i also know that not all chips are equal any mine very well may just not work above 2.55 ghz.. but i found it wierd that my computer wont post past 1.85v.. ( iactually think i fucked something up tonight trying 1.9v.. possibly fried my agp slot) so i am thinking my psu just doesn't quite have the juice since it is so much smaller (in both power output and size) than a good full size one..