The heart of the system is Supermicro's X5DAL-TG2
motherboard. I've been very pleased with the P6DBE PIII board that lasted
for so long in the previous
incarnations of my PC, and
although Supermicro's boards are notoriously devoid of over-clocking
functionality they have a well-deserved reputation for stability, build
quality and future-proofing that made them an easy choice for the new
system. With my heart set on another dual processor system, a
HyperThreading Xeon was the obvious choice for an Intel bigot, and
although most boards using the E7505 "Placer" chipset that matches best
with the workstation Xeons are in the larger Extended ATX form factor,
there are a couple of the regular ATX format required to fit my sleek
desktop tower case.
I was quite concerned over the lack of PCI slots on
these smaller boards, having filled all five slots on my old system and
still wanting more, but with two gigabit network interfaces on the
motherboard itself I decided that I'd be able to manage. In the event, I
retired my PCI serial port card in exchange for greater reliance on USB
connectivity, and I still have a 100MHz PCI-X slot free for whatever "the
next big thing" turns out to be. One significant lure was the presence of
a Zero Channel RAID facility based around a 64bit 66MHz PCI slot, and the
availability of a matching Serial-ATA RAID card to replace the ageing
Promise Fastrak IDE controller was what finally decided me.
A gigabyte of fast error correcting memory filled two
of the four DIMM sockets, and the two legacy IDE channels are used serving
my tape, CD and DVD drives with a port to spare for emergencies. As usual,
the inside of the PC is full and rather busy with wires and connections,
but there's still room for growth when even the rather generous initial
specification begins to look dated. So far, so good - but the build was
not without its painful moments, and in the end took around a week!