I contacted the manufacturer. It does require a 2 pin connection, and I have ordered it from their supplier.
For those ordering the ARC1680 raid card, here's the address of the USA located distributor I received from Aareca's California tech support:
Dear Mr. Rowby Goren:Yes, it is two-pin connector for our fan. You may purchase it from our distributor listed below.
kaleidonet, Inc. Address: Fremont, CALIFORNIA 94538Tel: 510-438-0288Fax: 510-991-9928
I assume it's a standard type fan, so if you can buy a 2 pin fan elsewhere it should work. But I went ahead and bought mine from them for conveneince since I live in California
you could have just used any spare slot on the mobo,
what are your temps, for the raid card.
I see on the motherboard a specific 3 pin that says CPU fan -- I could use that -- but the wire from my little fan won't reach it. There are other closer 3 pin connections on the p6x58d motherboard but I am not sure if they are for powering a fan.
Here's a portion of the motherboard with some of the connections. Could I use any of the other 3 pin connections?
In the meantime I expect the new fan will be arriving today or perhaps tomorrow. So I might just wait until then and use the "official" Areca fan.