Multiple Power supply Guide - Page 14 - Overclock.net

Boomstick68 · 07-21-09

I'm glad I asked before doing because it certainly isn't enough. I'm gonna look for a good single 12v rail PSU that will carry me on to my future i7 build. I have alot to learn and I'm glad you guys are around.

shinji2k · 07-21-09

A single decent PSU with enough capacity is always a better choice than running two PSUs.

Threefeet · 07-21-09

Quote:

Originally Posted by shinji2k

8A is just from the external PCIe, you have add the 4-5A from the slot. That puts it at ~150W. But his secondary PSU will only be supplying power to the 6-pin PCIe connectors.

And I fail to see how that thread you linked to adds anything. TDP may be 157W but TDP is hardly ever an accurate estimation of power consumption. I can draw 190W running a renamed Furmark on the 4870 and I have seen the 4890 hit 220W in a review running Furmark.

TDP may not be an accurate estimation of power consumption, but a 13a emachines PSU would be very lucky to run a 4890 with any kind of stability. You even pointed out that you've seen a 4890 hit 220w under heavy load, into the territory of the dual GPU cards.

Anyway you clearly know much more about this than I do so I'll respectfully bow out of this debate.

shinji2k · 07-21-09

Oh I'm not denying that Bestec would have trouble with it, but it mostly from the fact that it will only load the 12V rails. It's possible it could handle 8 or 9A on the 12V provided the other rails were properly loaded. But it's not easy to do that in a dual PSU setup nor all that sensible.

And Furmark is not a very good test for everyday usage. No video game can come anywhere near the numbers Furmark can load a video card to. Realistically you won't see the 4890 go much past 150-160W under just about any situation.

Le_Loup · 07-31-09

Hey Spooked,

I'm making a 7 fan, 1 x 430watt psu, 4x fan controller with led etc, laptop cooler bay frame thingamajig... (It's so far in design/development stages).

I've got the fans, psu, fan controller, but i'd like to know, for this power switch I ordered Blue LED Military Style Switch , It looked like it had "3x" power connector points at the back,

Power, Acc, Ground.

I figured what power and ground is, but acc? Any suggestions if that should be both power and acc on same line?

P.S. I'm trying to find the molex pins, and can't. Tried locally homedepot, the source, futureshop, best buy, memory express.. no dice..

Any ideal suggestions?

Was thinking I could just use a slightly thicker wire, wedge it into the part there, and utilize electrical tape... But I wasn't sure how "safe" that would be long term...

Internally between psu part and the front switch (for cable management) is 12-15 inches of wire on each line (power/ground primarily).

Thanks,

- Le_Loup

N2Gaming · 07-31-09

Hey Le Loup, have you tried Fry's electronics? That is of course if you have one near you. I found bare molex connectors and bare pins for wiring my own molex cables for fan headers and power connectors.

Good Luck,

N2G

Le_Loup · 07-31-09

Quote:

Originally Posted by N2Gaming

Hey Le Loup, have you tried Fry's electronics? That is of course if you have one near you. I found bare molex connectors and bare pins for wiring my own molex cables for fan headers and power connectors.

Good Luck,

N2G

When searching molex, it brings up headers or cables. (Neither I need). I just require a variant of the pin part, and similar wires (or I can just cut them out of a dead psu that came with a friends dead case, another story all together). Just so I can hook things up.

Contacted fry's, i'm in alberta canada, so checked info on what I can do, found out they do ship to canada (Yay!!!!!!) But they don't ship actual pc's and operating systems... Small parts (what i'm looking for) they do for sure.

If you can help me locate, or similar, i'd very much appreciate it, as i'm willing to order in 2-3 days the parts!

- Le_Loup

Would this work?

Or am I a tad off?

N2Gaming · 07-31-09

Quote:

Originally Posted by Le_Loup

Hey Spooked,I've got the fans, psu, fan controller, but i'd like to know, for this power switch I ordered Blue LED Military Style Switch , It looked like it had "3x" power connector points at the back,

Power, Acc, Ground.

I figured what power and ground is, but acc? Any suggestions if that should be both power and acc on same line?

It's possible the ACC is for the blue led in the switch.

That switch can be used in a couple of different ways. I think the ACC stands for accessory power. The wiring could be done any number of ways. It all depends on how you want it and how much wire you want to run. The best way to determine how to best use that switch is to try it out. :P j/k

Power of course is 12v+ and ground is 12v- So if you were running a circuit on that switch I think you could have the power go directly through the switch at all times from 12v+ to 12v- as a constantly hot wire or closed circuit and then the ACC you could use for an additional 12v+ circuit used w/the flip switch to turn it on and off at your will. I don't have to switch in my hands so I don't know if the continuity is always open from power to ground or if it's always off and the switch turns it on. If you dont' have a digital multi meter then I would suggest getting one that has the audio tone for testing continuity. The Ohm continuity tester comes in very handy more then you know.

Let me go dig up & look at my bag of goodies and take a few pictues w/the frys lable for part #'s so you can order what you want.

I'll edit this post w/the pictures. in a bit.

Edit: Pictures of the molex pins. I hope this is what you are looking for. The Fry's part numbers are the numbers all the way at the bottom of the white label in the lower right hand corner. I don't know if you need the male or femal pin so I gave you both.

Good Luck,

N2G

Le_Loup · 07-31-09

Fantastic! Thanks! Will start ordering, pm sent re: specifics. Thanks!

mikhail00 · 1 Week Ago

ok.. i know this is an old thread.. and im going to bump it up because i got a question on this.. see i got a current system which is on my sig right now.. but im planning on adding a raid0 setup and ALOT of fans and cathodes.. so on planning on plugging in the motherboard and the gfx cards on the main PSU.. and the rest on the slave PSU.. i have 2 Gigabyte Superb 550p psu.. 1 is in my current rig.. and the 2nd one was from an old rig (which i sold)..

here are my questions.. hope some1 can help me out..

1. can i use the old green wire from a generic PSU to use it as a jumper?..

2. is it possible to hotwire the main casing switch with both PSUs?..

3. is it safe to put the PCI-E connectors for the gfx cards on the slave PSU?..

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Multiple Power supply Guide

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