That temp was under maximum load using IntelBurnTest.
It's actually stable at higher frequencies as well. I tested it at 2.75 GHz and the temps only got to 72*C. Intel Burn Test also said the CPU was stable. That is 18* from the maximum of 90*C. If I do decide to keep it OCed, I will leave it at 2.66 GHz. My temps do not exceed 70*C at that frequency. From 2.13 -> 2.66, I am gaining quite a bit, so I don't want to push my luck.