A Little Start of the Weekend Update:
A plan for how much power to have available, and how to manage that is always one of the early things to have figured out on a new build.
It isn't usually a big deal, unless of course, you're planning quad OC'd GPU's, multiple pumps, half a bazillion fans for mega rads and plenty of OC on the CPU.
OC'd 7970's are pulling over 300W a piece, nearly 200W for an OC'd 3930K, 100W for 20 rad fans, 150W to 200W for 6 D5's, it can add up quick.
The biggest PSU seems to be the Lepa 1600W, which is made by Enermax and to its credit has received very good reviews. I was thinking about using it which is why I read the reviews.
The downside is that while it's a powerhouse, I'm still pretty old school and prefer single rail.
I'd also like to have more power capability, so that if I need 1600W, I can get it while not running the PSU at 100%.
To that end, I opted for a multi PSU setup.
The Main PSU will be located in the usual PSU location of the new 820, same place as it is in the switch 810 and the phantom.
The secondary PSU is going to mount under the optical drive cage in place of the HDD cage, using the mounting sliders from an 810, so that it can slide in and out.
The main PSU will run the Mobo, one GPU, WC pumps and rad fans, and case lighting.
The secondary PSU will run the other 3 GPU's.
Now it becomes clear why I got 2 of the NZXT Hale 90, 1000W PSU's.
To get the secondary PSU set up, it needs to turn on when the primary turns on, and since it's for GPU's only, it doesn't need all the cables that NZXT doesn't normally modularize.
So I hacked 'em off . . . or carefully removed them, depending on one's perspective.
Once I had the PSU open, I wasn't comfortable with running 3 GPU's off the rear modular connectors, as the wiring to them and the PCB itself, just didn't look like that was a good idea.
As an alternative, I took 2 of the 8 pin extensions that come with NZXT cases and cut the male end off, since the female end is identical to the modular connectors on the PSU, and connected the wires to the locations from which I had removed the original non-modular cabling.
The result is a fully modular PSU that should be easily capable of running 3 hi-end OC'd 7970's.
Well it will be as soon as we have a way to turn it on . . .
I brought out the green "turn on" wire and a gnd wire and made up a relay board, so that when the primary PSU turns on, its molex connection to the relay board delivers 12V and pulls in that relay, turning on the secondary PSU.
Initial testing shows everything to be working as planned.
I'll work on getting it mounted tomorrow.
Below are some pics of the PSU mods:
Big pile of wire to add to my "usable scraps" bin:
Notice the pressed on connector on the black wires group, that's supposed to be securely soldered to the PCB, but it came out by itself, a real bad QC issue that could have caused problems.
My big azz soldering gun wasn't enough to unsolder the connections. I had to cut the wires off, and then drill the solder/wires out of the connectors to have a place to put the new wires from the re-purposed 8 pin EPS extensions in.
Here's the PSU open where you can see the 8 pin extensions wired in as 12V sources:
The regular NZXT cables connect to these interchangably with the rear panel connectors.
Here's a close up look:
Here's the cover / bottom back on and everything is still working:
You can see the black and green wires at the bottom of the pic. They ave a jumper on them as I hadn't made up the relay board yet
Here's the little inline relay board. You can see the molex plugged into a small PSU to test the operation:
Here's a close up of thr relay board, nothing fancy at all. I'll put some heat shrink around it when I get some big enough, after I took the pic, I put a few coats of clear laquer on it to keep out moisture:Edited by IT Diva - 11/30/12 at 7:20pm