Ok, not that many people are still playing with one of these Gen7 Microservers, but I thought I would post this just to update this thread.
I have El Capitan 10.11.6 running on a HP N36L Microserver!
Before anyone gets carried away I have cheated big time, by installing OS X 10.11.6 (15G31) on another AMD PC I own, and moving the hard drive from the Asus Sabertooth & FX3850 PC to the Microserver. With a few tweaks to the Extensions folder and a change of the smbios file this has worked without too much hassle.
The AMD install follows Shanee's installation methodology with Enoch as the boot loader, which is similar in most ways to Chameleon. I have replaced the apple kernel with an AMD Kernel created by one of the AMD developers on this site, not sure which as I tried a few before settling on this one - Darwin/x86_64 [Darwin Kernel Version 15.6.0: Fri 5 Aug 2016 21:00:14 BST; root:xnu-3248.60.10/BUILD/obj/RELEASE_X86_64]. Sorry can't point you to the kernel.
Smbios used for the Microserver is Mac Pro 3.1.
org.chameleon.boot.plist is attached.
Boot Args: -v kext-dev-mode=1 npci=0x2000 usekernelcache=No
I have disabled the onboard Broadcom Ethernet controller and I am using a Realtek 8111 ethernet card in the x1 pcie slot.
I have an AMD HD 6450 2GB graphics card installed in the x16 pcie slot.
I have a few minor issues with USB details not showing in 'About this Mac'. But otherwise my bluetooth and Wi-Fi usb dongles attached to the Microserver work without any issues.
I thought it would take a while for anyone to be able to get El Capitan up and running in a reasonable manner on one of these old Microservers, and I wasn't wrong, I have managed it just before Mac OS X 10.12.0 is released.
Anyway, good luck to anyone else interested in getting the latest OS X running on one of these servers.