I've recently bought a HP Elite 8300 Tower and have tried to install OS X 10.12 on it with moderate success.
Specs:
i5 3450 (the computer came with a 3770 but I used it on another build)
Nvidia GT420
8GB DDR3 1600MHz (4x2GB)
1TB SSHD
TP Link TL-WN725N Rev 2.1 (I can confirm that this one also works, not just Rev 2.2)
Problems I encountered but managed to solve:
After the install, I selected the "use Nvidia web drivers" option in clover. Upon booting, the desktop was the correct resolution, but the image was really messed up. After endless search and nearly buying a new GPU, I found a unrelated post that mentioned that I wasn't supposed to use that option. Lo and behold, when booting with clover with no options selected, it worked like a charm.
I also couldn't boot without the install USB stick inserted and couldn't figure out why. While trying to create my SSDT using the shell script, it would give me an error, saying that the CPU wasn't supported by the motherboard and said it was a iMac14,2, which baffled me, since I selected iMac13,2 in MultiBeast and it said it installed successfully. I was able to set the PC to iMac13,2 using the Clover Configurator and it's working now.
I tried to check wether or not the SSDT was working using MSRDump.kext with gave me really weird permission errors on the kextload command. I then downloaded it using the Mac itself ( I had previously downloaded it on another computer) and after that it worked.
My current issue:
I don't think the SSDT is working. The MSRDumper kext only displayed 2 states, 16,31 , which I later confirmed with HWMonitor.
I can't figure out why for the life of me. I place it in EFI/Clover/ACPI/patched. Is there another step I'm supposed to do? Change something in the clover config?
I've uploaded the SSDT, since after checking the one posted by pastrychef, they do look slightly different ( other than his being for the 3770)
Also, it feels like it stutters a bit, I'm thinking it might be from just having 2 P States. It's mainly the first input after it's been idling for 5-10 seconds. I'm assuming it goes into the 1.6GHz state and has to jump to 3,1GHz which causes the slight lag/stutter.
Any advice would be really appreciated.