After a number of distractions and delays, finally got around to ordering and assembling. Even though I have an early PSU (S/N S0509......) (whose seal was broken on arrival), everything seems to be working! System config:
P150 w/Neo HE 430
ASUS A8N-SLI Premium
2 x 1Gb OCZ Platinum 2-3-2-5
2 x Samsung 2504c 250 Gb SATA in RAID1 on Nvidia controller
ASUS EN6600LE/TD/256Mb Silencer
Gigabyte Combo Drive (CD R/RW, DVDROM)
Sony DVD R/RW
Matsushita combo floppy and card reader (USB)
Currently using the stock 120mm tricool fan on low, 2x92mm Nexus fans on the front, stock HSF on the CPU, with Q-fan and cool'n'quiet enabled.
Aside from having to cannibalize an old XT case for a speaker (P150 doesn't have one), construction/installation went pretty much pain-free, and it's close to silent. At idle, I can't hear it at all. I have yet to seriously stress test it. Just after the build, it did crash when I started two number crunching (CPU intensive, little I/O, no graphics) programs in DOS windows, set affinity for each to a different core, and upped priority to "above normal" on both. This runs both cores at 100% cpu. After maybe a 1/2 hour, it rebooted. Haven't tried this again, but will update if it appears to be a problem.
The bios complains about low cpu fan speed and low chassis fan speed on boot, but proceeds after an F1 with no problems. I'll live with this for a while, and then disable the warnings in BIOS. ASUS-Probe was giving me intermittent high vcore warnings (increased to 1.51v occasionally at idle). I'm not sure how accurate that is. Increased the warning threshold to 13% (instead of 10% default) to make it go away.
CPU is running 39 deg C at idle.
I'll update this with further stress testing as appropriate.
Anyway, I'm 3 ft away and can't hear it
Any recommendations for alternative voltage/fan speed monitors would be welcome! The ASUS program can't seem to detect chassis fan speeds below 600RPM, or maybe this is because I have both 92mm's daisychained on the same fan header (which is controlled by QFan). And I'm a bit nervous about pushing the thresholds on vcore warning levels, but so far, so good.