Well I own a couple of HP Motherboards and all of them has the bios reset issue expect the newer ones with a American Trends bios.
The ones I own are:
HP Compaq 8000 Elite SSF PC with a Intel Core 2 Duo 3.2Ghz + 8gb Memory (doesn't show the bios brand I think it's standard HP) Bios Resets
3x HP Compaq 6005 Pro MT with a AMD Athlon II X2 3.0Ghz + 8gb Memory (doesn't show the bios brand I think it's standard HP) Bios Resets
I also own :
3 HP Compaq 8200 Elite SSF with a Intel Core i5 3.3Ghz + 8gb Memory (all 3 have a American Megatrends Bios) Bios does not resets and everything works smoothly.
My old AMD PC's with ASUS Motherboards and Megatrends Bios's both run smoothly no bios reset.
But I wont be using those because it doesnt have a onboard gpu so it will consume more power when a gpu is added.
So yea my conclusion is that a american megatrends bios is the one that is supported without issues.