OK, I'm now using my SB62G2 as my main machine and it's already pretty quiet, but I'd like it to be quieter still.
First job is to replace the Sunon fan with a quieter model, possibly a Panaflo from here. Second job is to think about buying a passively cooled Radeon 9600 to replace my Gf4Ti4200, which has an annoyingly whiny Thermaltake fan running at 5v; however, as I hardly ever play PC games any more, it's a little too pricey an upgrade to fully justify, so I might not get around to that bit.
I already have a SilentX PSU and very fine it is too, so that's taken care of. My remaining question then is the northbridge fan; as I'm using an AGP card, how safely can I pull it? Should I get an oversized passive cooler, or is the mini 'sink it already has up to the job? Can I even fit a passive cooler? (Hmm, must check that last point).
Anyone have any sage words of wisdom for me?