If I set the BCLK to 200 MHz, then I get a 4.0GHz overclock. BUT, then I have to choose between a DRAM frequency of 1603 or 1230 (or something I don't exactly remember the lower number but it was in the 1200 range).
If I set the BCLK to 199 MHz, then I get only a 3.98GHz overclock, but I can then set my DRAM frequency to 1595, which is pretty good since its rated for 1600.
Either of these settings gives me CPU load temps of about 70-72ºC (or 65-67ºC; I'm not sure because two of the sensors always read higher than the other two), and I'm not comfortable pushing temps above this range, so bigger overclocks aren't really an option for me to fix this.
I know this is a pretty small performance margin we're talking about here, but I was just wondering if it's safe/stable to run 1600 memory at 1603MHz. I've never messed around with RAM stuff before and I feel much more unsafe with it since I don't know how to check their temperatures, don't know if they can reliably run at higher speeds than they're rated for, etc.