HP N40L aka Build Your Own Cheap NAS
Although the server was supposed to only support up to 8GB ECC RAM, we found a post related to some tests about supported memory for the N40L server.
Finally, HP N40L (found brand new for ~170€ on eBay) seems to be a really nice choice for homemade NAS. With four 3.5" bays and a 5.25" slot (which is a perfect spot for docks like IcyDock MB994SP-4S in order to plug four 2.5" disks, or soon the IcyDock MB996SP-6SB one in order to plug 6), and the possibility of upgrading to 16GB RAM, all in a 26.7 x 21.0 x 26.0 cm box, it quickly becomes handy to do what you want with it (for instance Nexenta ^^) :
So we took a shot, mainly because the Patriot 2x8GB G2 non-ECC is less than 100€, which make the whole NAS really cheap !
The exact tested memory model is PATRIOT Mémoire PC G2 Series 2x8Go Dual Channel DDR3-1333 PC3-10666 CL9 : PGD316G1333ELK
There is a BIOS modification available in order to access some features hidden from the original one, as the hot swap disk support, the breaking of the 1.5GB/s limit for the ODD port, ! available here: Modified BIOS for Microserver N40L enables hidden features