After being frustrated with my Corsair AX1200i PSUs which kept shutting down randomly, I went out and bought an EVGA SuperNOVA Platinum 1600W.
Nice PSU: it can power three Neptune modules with plenty of juice to spare.
Today I noticed a burning smell (!), and immediately ran downstairs to my garage and switched off my Neppy (still haven't had time to get my bonus Neppy running yet). I'm gutted, two of my five modules have the bottom three pins burned out of the power connector. It also destroyed two of my PCIe 2-to-1 cables (luckily I have spares). Both of the burnt modules were powered by the EVGA, which claims to have Over Current Protection, but it obviously didn't kick in. Now I have more respect for my AX1200is, I was at my wits end with them, but all along they were just protecting the modules by cutting off with OCP (I didn't know that at the time, I just thought they were "dying"). This has only started in the last month or so, prior to that the Neppy ran like a trooper with no issues.
I have replaced those two burnt modules with bonus modules, and they seem to be working fine. However, the DC/DC avg temp on the bonus modules is about 10C higher than the original modules.
I was running all modules at 475MHz, and have been since July 2014. Now that I've suffered the loss of two modules, I have taken the precaution of down-clocking the original modules to 450MHz, and the bonus modules to 425MHz as their cooling isn't working as well as the originals. After doing this, the Neppy is still hashing at about 3TH/s, which I'm fairly happy with.
I'm not happy with two modules with burnt power connectors and one bonus module which was DOA due to a popped rivet on the bottom (it's on my to-do list to inquire about RMAing that bonus module).
As for the two modules with burnt power connectors, can I assume that the ASICs are still ok? Has anyone tried repairing a burnt power connector, and had success in reviving the module?
I'm surprised about the 1200i. Ive been running my bonus neptune on 2 x EVGA G2 1000w units with no issues. Interested in selling the 1200i?
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