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Well, I guess this is nothing too extraordinary for some of you, but I have never installed SFP – whatever version it may by – taking Pulsar out of the box first, and then reinstalling it. I have always done the whole process with Pulsar into the computer, and so the IRQ was given automatically by the BIOS in my ASUS P4PE.

I have removed for the first time Pulsar, had installed the OS, and then put Pulsar back and installed driver and SFP 4.0. The point is that everything is that IRQ numbers have changed completely, and assignations too. Now I had Pulsar in IRQ 23 with Promise FastTrack 376 (the RAID thing for SATA), and USB. So three things in a single IRQ, I’m not surprised I had some bad noises coming out… This will hopefully fix everything, as it used to be.

Hola Nestor!

I always install as Standard PC with Plug'n'Play OS set to NO in the BIOS and then I set myself the IRQs for the cards.
I have observed that except from the actual slots where you install the cards, it makes some difference in performance what IRQ is assigned to them..

Could you please tell me more about it? Cheers.

I have uninstalled drivers first, then removed my Pulsar, then reinstalled it in PCI spot 5, and now Pulsar is alone in IRQ 21, problem solved and noises have disappeared.