I just put together a file server with the intel DBS1200KPR and 8GB of ECC RAM. System information reports ECC: Enabled
10.9 and Server.app installed without a flaw, everything works.
It's a mITX server motherboard and it doesn't have any bells n whistles.
Socket 1155
C206 chipset
The board has NO audio.
It has 1 PCIe x16 v2 or v3 depending on the CPU
Supports 16gb ECC unbuffered RAM total.
4 USB 2.0 ports on the back, 2 headers on the board. NO USB 3
2 Intel Gb Ethernet ports, 82574L & 82574LM both work with the AppleIntelE1000e.kext.
The CPU throttles and does the turbo thing, I'm able to watch the speed jump as the load increases using Fake FMC HWMonitor. I only see it at x16 and x32, not sure if it should be using any multipliers in between or not.
System information reports the SATA as Intel Series 6 Chipset. Even though the CPU is Series 7 I didn't need to add the patch for mixed systems.
You need a Xeon with integrated graphics the board has a dvi-i port, but it only supports 1024x768. Well, it might support more, but since i'm using it only as a file server at the moment I haven't really looked into it. Make sure the Xeon has a 5 at the end. The 1225 and 1265 support HD P4000 graphics.
If you're going to use a E3-12xxV2 IT MUST BE A DBS1200KPR, it has to have the R on the end or it won't work with an Ivy Bridge CPU's.
It's out of production and starting to get scarce. I got mine from Amazon. That and eBay are the only 2 places I've seen them at reasonable prices, just over $200.
All the documentation that came with the board list it as a DBS1200KP, in the footnotes it mentions the DBS1200KPR.
http://download.intel.com/support/motherboards/server/s1200kp/sb/g38894002_s1200kp_tps_r1_1.pdf
Intel DBS1200KPR
Xeon E3-1225V2
Kingston KVR16E11/8I - 8GB
Highpoint Rocketraid RR2720SGL
6 Seagate ST4000VN000
2 Seagate ST2000DM001