I'm running a P35-DS3R with this chip. I've literally just gotten it up and running, overclocked to 2.3GHz to check and it's quite happy. Having a sort of double-boot issue though, looking into it now.
Edit:
In case you haven't seen in the other thread I've posted, the boot fault was due to me being a numpty. I've seen a lot of people with the P35C have issues with booting, but the standard DDR2 DSR3 seems to be more reliable.