"I have been reading your Promise SX6000 saga and would like to comment that I have been having a lot of problems too. I did a google search (looking for sx6000, problem, promise) and came across your site.
My system specs are an Asus motherboard, Celeron 1000, 256MB, 5 WD200. Standard stuff.
I have been fighting to get the system working for a couple weeks, on and off, and now I think I will have to go back to a SCSI solution. I was advised to replace the motherboard, etc. Tech support is really bad there."
I think I can state some rules to work with the SX6000, based on my own experience:
Never use the SX6000 with an Phoenix BIOS.
It works perfectly with an Elite Group K7SEM: it has an Award Bios. In my disk box, it is the only PCI card: no chance of conflict.
If your chipset is the AMD-760, don't use a GeForce4 or a ATI Radeon video card: Their ROM is too big. A Matrox G550 is a good choice.
If you must use a SCSI card with the SX6000, the Adaptec 3210S works (but it is a RAID one). I never manage to make the Adaptec 29160 works.
If you want to use an Iwill MPX2 motherboard, look here.
If you use Western Digital drives, don't put any jumper on them.
And regarding Promise's customer service, I must say it was a bit slow but knowledgeable. Their RMA department in Taiwan was top notch. They processed my return promptly and they followed up on the questions I sent with the card I returned.