Its on the Supermicro site, as far as I know they only sell two versions of the D525, and two versions of the D510 Model numbers either X7SPA or the X7SPE, Difference between the two being one isnt exactly mini-ITX
Links to the Supermicor site with all there specs:
X7SPA-HF-D525
X7SPA-HF
X7SPE-HF-D525
X7SPE-HF
As far as ram goes, iv been told the Supermicros are very picky. but then again they are a server board, not ment for home users. But Iv read and stuck with crucial memory and it works pretty good. I have these, and there working good on my SPA-HF-D525. Though a tad overkill for pfSense, I bought it in-case in the future I want to move this server for different duties.
I have read some places that Kingston memory works good too on Supermicro boards. If you goto the supermicro pages theres a tested memory link, and micron is listed, and I believe they supply the chips for crucial. You can also goto the crucial site and the Supermicro boards are listed on there too.
Kingston memory has worked well on my D510 board. Like you mention, SM has a link about which memory that has been tested. If anyone plans to use a SM, I would pick memory off of that list.. Anything outside that list is asking for trouble.