Ah, that's right, I was thinking that you had 8 cores instead of four. Well, you may want to keep -smp 3, but you'll probably want to do a little checking first. Try running just the gpu with no smp folding for an hour or so, keep an eye on cpu usage. If it's nowhere near 25%, then just run with -smp and no number. But if it's anywhere between 7-25% or higher (and I'm guessing here, so grain of salt) then you may want to do -smp 3. You should be getting 12k-15k ppd from gtx 570, and I'm guessing at least that much from smp. It's a little harder to predict smp though, with the bonuses there's a non-linear point value. Oh, and make sure you're running with a passkey setup, that's very important, you must have one to get the bonuses.
As far as fahmon goes, you may have some problems with it. I think that the latest version does calculate bonuses, but I'm pretty sure that they haven't updated for the new client. That was a fairly big change, so no one has really caught up to that yet. If you stick with the previous clients, you should still be able to use fahmon. So if it's a deal breaker, then I'd say stick with the old clients. I'm actually running the old clients myself, since I have 3 machines running, it's easier to keep track of them with an old monitor (I'm using HFM.net). The new client does give you a monitor, so that may be enough info for you, although it notably doesn't do any ppd estimates. But definitely keep an eye on your stats, and make sure you're getting credit for stuff that you're doing.
Oh, and by the way, is your handle in folding the same as your name here? Thought I'd try to take a look and see if you're getting credits.
Yep, same handle, though it seems I have yet to complete an smp unit with the new delio. The smp projects are taking a LONG time- any particular reason for this? I'm running ~13k PPD on my 570, but roughly .8 units a day on an OC'd i5 2500k. Something fishy here...
Oh, and I read some FUD that bonus points don't begin to calculate until smp #10; that true?