Well I tossed in 32GB of Registered ECC 1333 memory. I wanted to populate all 4 DIMMs to run Quad channel.
I bought registered ram simply because it was much cheaper than unbuffered ECC. I don’t know why registered Ram is so much cheaper
32GB (4x8) DDR3 Registered ECC is about $100-$125 used on eBay.
32GB (4x8) DDR3 Unbuffered ECC is about $300 used on eBay.
I was slightly worried after ordering it after reading that registered Ram is generally not as widely supported by MBs as unbuffered and the eBay seller even tried to warn me that they might not work and kept asking for the motherboard model. But when they showed up I tried them out and they work just fine. They are Samsung 1333MHz sticks and I can actually run them at 1600. When I booted up the system the BIOS setting stayed at 1600 from my regular 2x8 non-ECC sticks that were in there before. And the system booted up fine but I didn’t leave it. Maybe I’ll put them back to 1600 and check stability.
But now the bad news. The board apparently can’t run Quad channel memory, despite having 4 memory slots. CPUz reports the memory running in dual channel, with DIMMs 3,4,7,8 populated even tho only 4 DIMM slots lol.
The bios is even more confusing, listing 12 total DIMM slots with only 2 channel pairs populated.
Channel 0 DIMM 0
Channel 0 DIMM 1
Channel 0 DIMM 2
Channel 1 DIMM 0
Channel 1 DIMM 1 - present
Channel 1 DIMM 2 - present
Channel 2 DIMM 0
Channel 2 DIMM 1
Channel 2 DIMM 2
Channel 3 DIMM 0
Channel 3 DIMM 1 - present
Channel 3 DIMM 2 - present
Lol. Oh well. At least reports and benchmarks seem to show no performance hit using dual channel instead of Quad, and only ~1% performance using ECC reg vs non-ECC