Most of my posts are in this section so I look at most of the new kits from Corsair, G.SKILL, Mushkin and few others.
Frankly, I was of the opinion of >1.50v DRAM did no harm on the SB since day one because most of that voltage is directed at the RAM itself, BUT in contrast QPI/VTT/VCCIO/VCCSA is (essentially CPU IMC voltage) is directed at the CPU and the CPU's IMC. The reason >1.50v on the SB got such a bad rap is because the difference between the CPU's IMC voltage and DRAM Voltage needed to be around -0.30v~-0.40v and the default SB IMC voltage is 1.00v and 1.15v was Intel's max spec. The problem was 1.6v kits initially like the older X58/P55 kits required >1.15v CPU IMC voltage to remain stable. Nothing has really changed other than 1.20v CPU IMC has proven to be fine and non-degrading to the CPU, plus improvement in RAM design to increase that gap between CPU IMC & DRAM Voltage disparity.
In contrast the P55/X58 (CPUs) could sustain 1.30v~1.35v (QPI/DRAM Voltage) and maybe even 1.40v without degrading those CPUs.
The degrading of the SB, SB-E, and IB is around 1.35v VCCIO/VCCSA Voltage (proven) and 1.30v is borderline 'safe'ish' (1.20v is my max), This is just like vCore -- but the 'degrading' differences between the CPU vCore on the SB, SB-E and IB are 'somewhat' different so it would seem the architectural similarities are the CPU's IMC.
Although, IMO and from what I've garnered (blown CPU's) a vCore of 1.55v and higher will degrade SB, SB-E, and IB regardless of cooling including LN2.
/my 2 cents.