Tested how far you can go at 2-3-3-5? I've got TCCC (shouldn't be very big difference except that UCCC's is leadfree and TCCC has lead) and they can do 2-3-3-5 64µs RMS @ 231,5! I tested them in Prime95 Blend Test for 2,5 hours, then they had an error, but I'm sure it is the CPU that was the weak link.

Only thing is that they won't boot at even 211 with 2-3-3-5 from BIOS, but it goes really smooth from windows and ClockGen/i865 Tweaker.

Mine are also Generic Samsung, K4H560838F-TCCC, 434.