Well, my 12v line fell below ATX spec (11.4xv or so) before I connected it. Now with the one connected, it stays @ 12.03v.

I had lots of crashes under load, (sometimes from GFX drivrs) so i'm supposing it was due to low voltage running trough my cards/mobo. All my voltage settings are the same as they used to be before the connection, but now it can pass long-term idling/OCCT'ing. So it did something...