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Two PSU's for Dual 8PIN. - Page 3

post #21 of 27
Quote:
Originally Posted by fl0w3n View Post
Cool thanks for the input.

I am not worried about having trouble with only 1 8 pin, I just thought even a little extra juice would help stabilize current to make my board even happier when I'm trying to push it.

Additional plugs is not to stabilize current but to lower vDrop due to line resistance.


I doubt you need it.


However, some PSUs do offer a hardwired 8-pin EPS and a 4-pin ATX AUX plug. It isn't two eights but is enough unless you are doing some LN2 suicides.
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post #22 of 27
I have dual 8 pin on my Silverstone PSU
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post #23 of 27
Thread Starter 
Quote:
Originally Posted by Birthday Attack View Post
I'm not saying you need identical power supplies, I'm saying you need one power supply. This isn't impossible BUT... it seems like a really bad idea to me. Though you say that you've seen lots of people do it before so maybe I'm off-base. However, from my understanding of SMPS's work... this could go wrong fast.

Depending on the SMPS topologies used it might be essential to bring them on at the same time, or wire them together NOT through the motherboard...

If I were to do this... I would want to do a lot of testing first without a motherboard to melt connected. Wire the ground lines together and power up both PSUs (not connnected to a computer at all) and use a multimeter, one with a fuse, in between the 12V lines to see how much current is flowing between them.

I would also make sure I had the 12V lines wired together outside of the motherboard so the motherboard isn't the ONLY path through which power can flow between them. I figure it's better to melt a wire than a motherboard.
Good thoughts on the subject, and I believe you're on the right track when it comes to using two different psu's per 8 pin.
Most wiring I would be willing to do is connect a ground from each psu's 24 pin to each other so they share the same ground.
Quote:
Originally Posted by AliceInChains View Post
is there not an adapter available for stuff like this? like molex to 8-pin? or pcie to 8-pin
I believe there is, that's a possibility too.
Quote:
Originally Posted by DuckieHo View Post
Additional plugs is not to stabilize current but to lower vDrop due to line resistance.


I doubt you need it.


However, some PSUs do offer a hardwired 8-pin EPS and a 4-pin ATX AUX plug. It isn't two eights but is enough unless you are doing some LN2 suicides.
Thanks for the clarification. And that would only be vcore drop, correct? If I notice with my DMM that I'm getting excessive drops during my benching which causes me to crash, am I safe to plug in the 2nd power supplies 8 pin?

Or are you saying that, when using two 8 pins, they need to be coming from the same PSU?


To clarify my statement earlier that I see multiple PSU's for one system all the time, I didn't mean two different ones plugged into the 8 pin...otherwise I wouldn't be asking this question. Usually it's other random things, like one for the motherboard, one for the GPU's, etc.


For example:

Here is Uncle Fester using two AX1200's



Here is DPA's World Record SLI Vantage setup, TPQ1200 + AX1200:



Just a few quick pictures I found
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post #24 of 27
Quote:
Originally Posted by fl0w3n View Post
Re-read my OP. My question isn't "will I be fine with only one" or "do I need more than one".
Thanks for the input anyways
Perhaps I should be more clear. If you don't have a power supply that supports dual 8-pin natively, then you shouldn't use a second power supply. I don't know for sure that it would cause any damage, but since the second cable isn't really needed, it isn't worth the risk of damaging your equipment.
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post #25 of 27
Usually the multiple PSU setups are for benching highly modded video cards along with those 6ghz + 980/990x. The modded beasts demand a lot of power. Other than that, I'm pretty sure i've done 5ghz+ with the 920 and classy just using one 8pin. Lately however, I've been using two 8pin just because it's available.
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post #26 of 27
Thread Starter 
Quote:
Originally Posted by kremtok View Post
Perhaps I should be more clear. If you don't have a power supply that supports dual 8-pin natively, then you shouldn't use a second power supply. I don't know for sure that it would cause any damage, but since the second cable isn't really needed, it isn't worth the risk of damaging your equipment.
Thanks for clarifying. Makes more sense.
Quote:
Originally Posted by Mikecdm View Post
Usually the multiple PSU setups are for benching highly modded video cards along with those 6ghz + 980/990x. The modded beasts demand a lot of power. Other than that, I'm pretty sure i've done 5ghz+ with the 920 and classy just using one 8pin. Lately however, I've been using two 8pin just because it's available.
Yeah that's normally where I see them too.

I'm shooting for 5.3 bench stable, and as long as I can tune for that I think the hardware I have is capable of doing that. I know the CPU is for sure.
My thoughts were just that the 2nd PSU's 8 pin would provide a tiny bit of head room, or at least make things a little easier.

I'm assuming your psu has two 8 pins?
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post #27 of 27
yes, I have two 1kw psu. Both have two 8 pins, but the 2nd one is a modular one.
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