I want to help you but don't own a 3800+, however I have had experience overclocking one and will tell you the settings used, for more info either reply here again or PM me or pandapimp since it is his computer I'm talking about.... anyways, the highest stable overclock with a DFI LanParty UT SLI-D was ~2.6GHz, we could get there via 260x10 or 325x8 but we chose 260x10 since his RAM was only DDR500 anyways so the 325 would only be beneficial if we could run it in 1:1 with DDR650 RAM
however, he insists on using over the top voltages so all of his volts are maxed out except the vDimm which was 2.8, his CPU was 1.550v+113% VID control which gave us ~1.7vCore which is MUCH more than he needs but whatever, its his system, plus the Big Typhoon keeps temps in check so its no biggie.
His temps are as far as I remember ~30c idle and ~45c full load with the Big Typhoon and 1.7vCore.
And lastly, when you clock a CPU at 2.6GHz or whatever, both cores are running at the same speed since the mobo can only assign the CPU one speed so they both use it, make sense?
Also, be sure to lock your PCI/AGP/PCIe/SATA at their default values and lower your LDT multi to keep it under 1000 at all times (HTTxLDT multi=LDT so for pandapimp's system, he has 260x3=780)