I have 2x4GB Corsair DDR3-1600 memory sticks rated at 9-9-9-24 at 1.5 V according to the product description. However my motherboard set my memory to 1333, so after OCing my CPU I wanted to set my RAM to 1600 while decreasing CAS from 9 to 8. However it doesn't seem to remain stable according to Prime 95 (I fail blend tests after 30 minutes, but small FFTs I've tested for 2 hours so far successfully and will test for longer later). So is it ok to set voltage from stock 1.5 to 1.65?