I'm working on an undervolt solution, should have prototypes this month.
I'm completely out of stock on DPS2K boards, but can get PSUs reasonable if he doesn't have a lot of stock. Pretty smexy setup, J4bberwork. The fan plate is an especially good idea.
Thanks for the comments.
If the PSU allows it, having a -0.2 to -1.2v sent to the A1 or A2 pins (12v sense) should allow 10.5-12v regulation.
To explain to people who are curious to know how it works, some PSUs are "sensing" the voltage drop as close to the delivery point as possible.
Usually, it's a voltage drop because of the length (resistance) of tracks/wires, and the amount of current drawn.
The PSU adjusts the output voltage to compensate and sense +12v at the delivery point.
Some PSUs circuits are made in a way that only voltage drop are compensated, since in normal operation the voltage can't rise across the wires/tracks.
Some other will still respond to a voltage rise, and will drop the output voltage accordingly.
What we are doing is tricking the PSU so it believes that the voltage at the delivery point is lower than expected. The response for the PSU is to send higher voltage to compensate.
There is still an overvoltage protection, usually around 14.0v, and also and undervoltage protection.
Some PSUs will allow down to +9v output, some others will stop just below +12v.
