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Am I trying to get too much from one lead?

post #1 of 7
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OK, I have been reading about PSU's and am a bit confused. I have a Corsair 520HX modular PSU. It has 3 18A +12v rails. The way my A900 is set up, I have 3 leads plugged into the PSU to run my HW. One is the PCIE for gfx card, one is the SATA for my 2 hdd's and the other is a molex for the rest. I am starting to worry about the molex. I currently run an MCP655 pump (usually on 3), 2x 120mm panaflo's, 1x 200mm antec fan, 1x120mm antec 3 speed LED, Sunbeam fan controller and 4x4" CCL's from 2 inverters. All the fans are connected to the controller which is plugged into the PSU lead.

Am I asking for trouble here? I have never noticed a problem and the PSU has worked great so far. I really don't want to run another molex lead as I am running out of room as it is. Is all of that running on one rail? Does the PSU automatically run the SATA, PCIE and molex leads off different rails?
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post #2 of 7
Your fine... The Corsair PSU's are really really well built and have plenty of AMPS on their rails... Your not asking for to much Watts on your Molex... i thikn your doing fine... Keep up the nice Oc though!
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post #3 of 7
The key is going to be in splitting the load between rails. Make sure that you don't have a great load on one rail rather than distributing the load between rails.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by rottenotto View Post
The key is going to be in splitting the load between rails. Make sure that you don't have a great load on one rail rather than distributing the load between rails.
How do I know which item is on which rail?
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post #5 of 7
There is no "key to splitting the load between rails." The Corsair doesn't really have three +12V rails, it has one. And even if it did, all of your Molexes would be coming off the same rail.

The thing you need to worry about is sending too much current down that single 18g 12V wire. Loads cause resistance and resistance drops voltage. The more loads you have on a single lead, the more the voltage is going to drop on that lead. If you can test the voltage with a digital multi-meter at the very end with everything on the wire run juiced up, I'd be curious to see if the voltage is even within spec.

The easy thing to do is to just run two Molex runs and call it a day. If you're really worried about it, might as well just do it. If you're too lazy or feel that the second Molex run might clutter up the inside of your case, then you're going to want to use a DMM to check the voltage at the end of that one run you're doing.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by jonnyGURU View Post
There is no "key to splitting the load between rails." The Corsair doesn't really have three +12V rails, it has one. And even if it did, all of your Molexes would be coming off the same rail.

The thing you need to worry about is sending too much current down that single 18g 12V wire. Loads cause resistance and resistance drops voltage. The more loads you have on a single lead, the more the voltage is going to drop on that lead. If you can test the voltage with a digital multi-meter at the very end with everything on the wire run juiced up, I'd be curious to see if the voltage is even within spec.

The easy thing to do is to just run two Molex runs and call it a day. If you're really worried about it, might as well just do it. If you're too lazy or feel that the second Molex run might clutter up the inside of your case, then you're going to want to use a DMM to check the voltage at the end of that one run you're doing.

Thanks. Once I get my RMA gfx card back, I'll fire her up and see what I get. I am assuming it should be 11.9v or higher?
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post #7 of 7
11.8V or higher. 11.4V is within spec, but I like things a little tighter than that.
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