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2x psu in one case - Page 2

post #11 of 54
Quote:
Originally Posted by PizzaMan;12031505 

EDIT: Wait, are you just using one PSU for board and CPU and the other for GPU? I'm confused.

That is the only way this would make any sense.
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post #12 of 54
Yes, but that's exactly what he haven't done.
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post #13 of 54
Thread Starter 
look i first had it like that, one for the cpu and one for the gpu. That wasn't working for me reason 1: screen started going blank understress, 2: gpu wouldn't OC over 850/1200 now OC at 900/1300 (air), 3: cpu couldn't OC to 4ghz, now OC at 4.2Ghz.
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post #14 of 54
im guessing he thinks he hooked them up in "parallel" so he theoretically has a 1300w psu now? i have no idea how it works or if this is even possible but im pretty sure thats what he thinks he has done.
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post #15 of 54
Quote:
Originally Posted by Lerkah View Post
im guessing he thinks he hooked them up in "parallel" so he theoretically has a 1300w psu now? i have no idea how it works or if this is even possible but im pretty sure thats what he thinks he has done.
parrallel dosnt work over a powerband (forgive me if im wrong) but i swear parallel only increases voltage...

so basically hes got a 700w psu.
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post #16 of 54
Quote:
Originally Posted by DeltaKINGxxx View Post
people forget as the ripple value is the same on both psu's it may cancel each other out and reduce ripple
No, people did not forget....

However, that is only in the best case. In the worst case, the ripple are additive. When designing something, looking at the worst case is much more important. At best it works better but at worst it is damaging your components. Cost-benefit analysis is clear.

Quote:
Originally Posted by DeltaKINGxxx View Post
look i first had it like that, one for the cpu and one for the gpu. That wasn't working for me reason 1: screen started going blank understress, 2: gpu wouldn't OC over 850/1200 now OC at 900/1300 (air), 3: cpu couldn't OC to 4ghz, now OC at 4.2Ghz.
Then there was something wrong with methodology or you did not account for cross-loading. Combine PSU will not and cannot increase stability.



Please, no one do what he did.... it is a terrible idea.
Edited by DuckieHo - 1/17/11 at 6:28am
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post #17 of 54
It's funny cuz this guy is also supposed to be an electrical engineer.
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post #18 of 54
Yea, my understanding is a little newb, but I know if you take two 110v AC lines and combine them you get a 220v line. I'm just guessing that DC would work the same way. So if this did work, he'd have a 24v line instead of a 12v rail. Components would be dieing quickly.

Here's what I think he happening. One of the PSUs is tripping OCP/OVP and cutting off. Leaving only one PSU operating. Though, since the PSU is still connected to the other one, its able to use the capacitors on the second one and may actually be lowering his ripple a bit. The fan will most likely still turn on the PSU that has shut off, as it's getting power from the one operating PSU. This sound plausible to anyone else?
    
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post #19 of 54
Quote:
Originally Posted by PizzaMan View Post
Yea, my understanding is a little newb, but I know if you take two 110v AC lines and combine them you get a 220v line. I'm just guessing that DC would work the same way. So if this did work, he'd have a 24v line instead of a 12v rail. Components would be dieing quickly.

Here's what I think he happening. One of the PSUs is tripping OCP/OVP and cutting off. Leaving only one PSU operating. Though, since the PSU is still connected to the other one, its able to use the capacitors on the second one and may actually be lowering his ripple a bit. The fan will most likely still turn on the PSU that has shut off, as it's getting power from the one operating PSU. This sound plausible to anyone else?
Nope.... Two 110v AC lines combined in-phase (or was it out-of-phase?) equals a 220v line.

DC does not have phases so two +12v combine still equals +12v. If a +12v DC was added to a -12v line, then you would have 24v.


The PSU internal circuits are still completely seperate from each other. However, each PSU is still making constant voltage corrections but this is not perfect so we get ripple. If a PSU can provide 50mV of ripple, that means at worst it can maintain 50mV. Now if you have two PSUs both providing 50mV of ripple powering the same line, the worst it can be now is 100mV (assuming there is not other monitoring/feedback/correction going on).
Edited by DuckieHo - 1/18/11 at 10:07am
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Once again...
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post #20 of 54
yes ^ are correct
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