This is a great card and a great idea from a reliable company - as long as you don't have a complex system running Windows 2000.
After I installed this card on my system, all chaos broke loose. This eventually caused Windows 2000 to become corrupt and crash and burn. I had to totally rebuild my system from scratch, wasting many hours. So it is buyer beware.
It turns out that this card needs four IRQs. Now I already had a soundcards, a couple of  Adaptec brand SCSI cards, and a graphics adapter. Problem is that under Windows 2000, all of these PCI cards are assigned IRQ 9. (The only way to prevent this (on my system anyway) is to disable ACPI Power Management - a job bigger than Ben Hur). Result: hardware conflict, system freeze-ups, driver corruption, and BSODs (Blue Screen of Death).
In summary: The DuoConnect 3121 is a good card. But if you run Windows 2000, have a lot of PCI cards, and you don't know an IRQ from ACPI or BSOD, then better stay away from it. Go for something simpler, like an Adaptec 4300. I am told that the DuoConnect 3121 installs without problems on Windows XP, which is more flexible with IRQs.
Yet I do not entirely blame the Adaptec company for the problem - though they could have warned me, the unsuspecting consumer, about the insallation risks in the marketing brochures! So therefore only 3 stars.
I can't fault Adaptec on their very good support. Adapter cards from other companies are cheaper than Adaptec brand, but the Adaptec support is worth the extra money. Which is why I replaced this card with another card from the same company. Adaptec refunded my original purchase price (but not the many wasted hours). So therefore at least 3 stars.
This is a great card and a great idea from a reliable company - as long as you don't have a complex system running Windows 2000. After I installed this card on my system, all chaos broke loose. This eventually caused Windows 2000 to become corrupt and crash and burn. I had to totally rebuild my system from scratch, wasting many hours. So it is buyer beware. It turns out that this card needs four IRQs. Now I already had a soundcards, a couple of  Adaptec brand SCSI cards, and a graphics adapter. Problem is that under Windows 2000, all of these PCI cards are assigned IRQ 9. (The only way to prevent this (on my system anyway) is to disable ACPI Power Management - a job bigger than Ben Hur). Result: hardware conflict, system freeze-ups, driver corruption, and BSODs (Blue Screen of Death). In summary: The DuoConnect 3121 is a good card. But if you run Windows 2000, have a lot of PCI cards, and you don't know an IRQ from ACPI or BSOD, then better stay away from it. Go for something simpler, like an Adaptec 4300. I am told that the DuoConnect 3121 installs without problems on Windows XP, which is more flexible with IRQs. Yet I do not entirely blame the Adaptec company for the problem - though they could have warned me, the unsuspecting consumer, about the insallation risks in the marketing brochures! So therefore only 3 stars. I can't fault Adaptec on their very good support. Adapter cards from other companies are cheaper than Adaptec brand, but the Adaptec support is worth the extra money. Which is why I replaced this card with another card from the same company. Adaptec refunded my original purchase price (but not the many wasted hours). So therefore at least 3 stars.