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New PSU = Higher OC?

post #1 of 4
Thread Starter 
ok, i just upgraded to a Thermaltake Black Widow 850 Watt PSU from my old Coolmax 650 Watt (witch dun Sploded)

the reason i got the new one was because the old one decided it liked fire a little too much, and what brought this on was i upgraded my single 5770 to cfx and started ocing them. once i was calling all the power from this little coolmax psu it just decided to give up.

with the coolmax psu i was able to reach a stable 900/1300 on both my cards along with a 3.375ghz on my CPU. after i picked up this new psu i am able to reach 950/1400 on the cards and i have yet to try to go higher with my cpu but it is still at 3.375ghz for now

now is this because of my new psu being able to put out enough juice for everything to keep running or was it just a stroke of luck? essentially i am asking, how much of an impact does a PSU have in overclocking?
post #2 of 4
If your psu is weak or just enough to power everything stock then a better psu will have huge effects on overclocking mainly due to its ability to provide more watts and cleaner power, you have to remember that as you get close to your psu's 100% output the more likely the voltages will drop, for overclocking you want your 12v line to stay over 12v, if it goes below this it will cause negative effects. Good top end power supplies are always better than cheap ones, when ever i buy a power supply i get the best one i can afford.
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Razer Goliathus Speed edition 
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by Kal777 View Post
If your psu is weak or just enough to power everything stock then a better psu will have huge effects on overclocking mainly due to its ability to provide more watts and cleaner power, you have to remember that as you get close to your psu's 100% output the more likely the voltages will drop, for overclocking you want your 12v line to stay over 12v, if it goes below this it will cause negative effects. Good top end power supplies are always better than cheap ones, when ever i buy a power supply i get the best one i can afford.
yea, i cant actually afford the one i am using now, my mother actually got it for me, i was just looking at the 600 Watt Thermaltake that they had in BestBuy and was gonna compare prices online and when we went to check out (she picked up some new stuff for her iPod) i noticed this beast sitting in her cart, was kind of annoyed because i wanted to make the money myself and buy a half way decent PSU but hey, my desktop is back up and running, and apparently being a college kid does not mean that mom and dad can't just buy you stuff for fun any more
post #4 of 4
IF the coolmax just dun gave up that almost certainly means it was running at very close to capacity. Esp. with a cheap PSU like that, if you're at it's 'breaking point', that would mean that the power going to your gpu's was likely very 'dirty' (full of ripple) and quite possibly the 12V output was dipping significantly lower than 12V. All these things combined could lead to a scenario where your max OC could be compromised by the lack of power.

IN this case, getting a PSU that doesn't have these shortfalls would indeed increase your max stable OC. It's also much better for your components in the longer term not to have them be subject to dirty power from a strained PSU, and of course the efficiency will be MUCH better because efficiency tanks on a strained PSU.

However it's definitely not the case that adding MORE power beyond what is actually needed enhances OC'ing ability any further. It's not like getting a 1200W unit is going to give you another big jump in your max OC or anything.

Just pointing this out for clarity
    
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CPUMotherboardGraphicsRAM
xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
Hard DriveOptical DriveCoolingOS
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb... plextor px-712sa - still the best optical drive... corsair h8o v2 aio W10 home 
MonitorPowerCaseAudio
asus vw266h 25.5" (1920x1200) abs sl (enermax revolution) * single 70A rail 850w silverstone rv-03 XFi Titanium 
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