Currently running my i5 750 prime95 stable at 21x200. Only problem is that it takes 1.5V . Load temps are 66C with my TRUE which aren't bad at all, but I'm still a bit nervous. Any tips on getting this voltage down while still maintaining stability? Is 1.5V even safe?

Full specs are in sig. RAM is running at stock speed / timings / voltages. Full voltages:
1.5V cpu, 1.25V imc, 1.5V dram, 1.15V PCH, 1.9V PLL