Got my DMX today (finally bid on one last week). Win2k automagically recognized it as ESS Maestro2E device - after a bit of card shuffling, that is. Looks liike a 53C895 based SCSI HA does not like interrupt sharing, and the last two PCI slots on the GA-686KDX appear to share an INT# line. SCSI + DMX = no go, Win2k stops on the boot screen. So I swapped slots between the SCSI and the Millennium II, the latter doesn't even use an interrupt with the standard driver. The Matrox and the DMX get along much better. EDIT: Seems like the two lasts slots may have different interrupts in MPS mode, but could be mapped to the same one on bootup. At least the SCSI is on interrupt 36, the NIC on 40, then there's nothing (the Mstrox might go here), then the DMX in the very last PCI slot on 48. The first slot is empty for ventilation reasons (draw-in area of DIY fan duct).
ASIO4All settings: No go with hardware acceleration (surprisingly, as this worked just fine with the AWE64's WDM driver), but with 3 kernel buffers and from about 384 samples of buffer size it seems to be skipping proof (I chose 640, ASIO for Winamp uses 15 buffers). The machine is a bit obscure, a dual PII 233 (Klamath) on i440FX (yes, EDO DRAM) isn't what you see every day. Hmm, there still is an occasional crackle with EQ on. We'll see how SMP proof the drivers are, so far they're working. (I didn't even bother to connect the digital I/O daughterboard.)
Even without the headphone amplifier enabled (at least I did not notice any hiss even with HD590s), I get quite sufficient volume out of HD420SLs, actually the volume is far from fully cranked up. Let's hear what my HD540s say... Pretty nice sound, might even beat my trusty Aureons unamped.
Not easy to tell though, the machine isn't the quietest.