I'm rebuilding the PC slightly, swapping out the MB and a dead PSU. I use 2 PSUs, each of which has a single 8-pin plug for the MB, while the MB has two 8-pin sockets. Strictly speaking I can't see me needing both sockets hooked up, being no über-overclocker, but just in case: is anyone aware of a reason why I can't or shouldn't hook up two separate PSUs? I assume it'll work just fine, but it's a situation I've never encountered before so I thought I'd ask.
I think we need more details - most consumer grade hardware isn't designed to run with two PSUs. The motherboard sends a signal to the PSU - via the main 24pin plug - to turn on, and without that signal the PSU won't power up. So you'd need to hack the wiring to send the power on signal to both PSUs.
What's the system specs? What PSU were you using? What PSU do you plan to use?
I think it is his system. Wouldn't be a splitter sufficient? Or molex to 8 pin?Originally Posted by scaryjim
http://www.ebay.co.uk/itm/Dual-Molex...-/221288873828
http://www.ebay.co.uk/itm/Startech-6...item4620d3f096
http://www.ebay.co.uk/itm/8-Pin-to-2...item27e71477fa
Only one PSU will get the 'turn on' command from the 24-pin connector. You'll need to rig a workaround for this on the second PSU.
edit: or I should just read scaryjims reply first
scaryjim (15-12-2014)
Those are PCIe power, I don't think CPU power connectors use those, do they?
System specs are indeed in "My System" to the left.
Turning the second PSU on is not a problem, I simply use a Multi PSU adapter. I use two simply because I have a lot of hard drives and fans installed and a second PSU cuts down on the number of cable adapters and extenders I need to fiddle with in order to power everything.
A splitter might work, but that's just another extra piece of cabling which I don't want.
Like I said initially, I don't actually *need* to fill the second 8-pin socket. However, since I do have two plugs available I may as well use them if no-one is aware of a reason why I shouldn't use two plugs from two different PSUs?
Well we gave a reason, and you've addressed it
Otherwise no.
It would have been fairly silly of me to install two PSUs unless I couldn't turn on more than one, no? ;-)
As mentioned I've never encountered two 8-pin CPU sockets before, so I wasn't quite sure that there might not be some obscure reason why both have to be powered from the same PSU. My knowledge of the interaction between PSU and MB is sketchy at best, so for all I know there might be guidance and regulation signals flowing back and forth which would obviously leave the second PSU out of the loop. On the other hand, if the 8-pin sockets simply receive full power at all times, then there's obviously no problem hooking up both units to the MB.
It's fairly simple - the PSUs provide a bank of power which the MB (or other components via the MB) pull from as required. The second 8 pin might just be for extra juice to PCIE lanes or something, and will only be drawn from if required.
Agrippa (15-12-2014)
Roger that, in that case I'll just go ahead and hook it up. It's what I assumed, but assumptions can be dangerous things if you don't bother verifying them....
Thanks a lot for the info, much appreciated!
Why run two psu's at all? If this is the pc in your system details with only a single GTX 970 you wouldn't even stress the CX600M let alone running a pair of psu's giving you 1250w. I doubt if you are pulling much more than 450w at the wall, probably even less. It's just pointless.
Nothing to do with power delivery. As stated above, I have a plethora of hard drives and fans installed and no single PSU allows me to power it all without developing an unholy tangle of splitter, extender and multiplier cables. Much easier to just slot in an extra PSU.
Also, I rather think that I'm the best judge of what's pointless or not in my own system.
No need to get shirty about it. You find it easier to fit a second psu than to have a few extra cables in that beast of a case? Your psu's (or one of them anyway) will be operating well below their optimum efficiency. Have you thought of having some custom cables made up (or do it yourself) so that you won't have to use extensions etc?
I'm not getting particularly shirty, I just find it mildly annoying that some random geezer on a forum, who have never seen the inside of my case and know nothing about my preferences, finds it necessary to stroke his ego by pronouncing my choices pointless.
That's all it was.
Then again, that's the internet in a nutshell really.
Anyway, my question has been fully answered, so I'll bow out here. Thanks again kalniel.
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