ASUS Maximus IV Gene-Z/GEN3 - overheating/voltage

I just replaced a defunct CPU Fan and while my CPU temps look better, the mobo was overheating (123c). I checked and a fan in the back of the tower was not working, so once that was fixed the SYSTIN temp did go down.
Feeling a little paranoid, I enabled monitoring in the bios and now I am getting red BIOS pop-ups quite frequently about voltage - which I read is quite common with ASUS mobos.
Is SYSTIN the mobo temp, and then SYSFANIN the mobo fan? Per the AI Suite and CPUID it looks like a couple of the fans may still not be working.
I am not sure what all the values are in CPUID - but some of the mobo temps do look high to me." class="img lazy">

It looks like some of my fans may still not be working, or are these optional (ALTFANIN2)? If I disable the ASUS BIOS monitoring, will the comp shutdown when unsafe mobo temps are reached?

Thank you in advance, any insight or troubleshooting steps are both welcome.

System Information
ASUS Maximus IV Gene-Z/GEN3 LGA 1155 Intel Z68
Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155
Corsair Force Series GT SATA III SSD
CORSAIR Vengeance 16GB
Cooler Master Hyper 212 Plus
Windows 7 64bit Proff
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More about asus maximus gene gen3 overheating voltage
  1. Do you have another PSU you could try, don't like a couple of fans dying
  2. Tradesman1 said:
    Do you have another PSU you could try, don't like a couple of fans dying

    Hmm, no. I may be able to borrow one. So, SYSFANIN and and AUCFANIN2 are both fans that should be running?
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