As delivered from Crucial, the latencies on this set of modules are 9-9-9 at 1333MHz. This, of course, they will do at 1.5 volts. Surprisingly, they do 7-7-7-20 at 1333MHz at 1.58 volts as well. Running at 7-7-7 was nice at the bottom end but the modules didn't get too much further without big volts until the CAS latency was increased to 8. I bumped the voltage up to 1.65 and started the march to a higher speed and was able to pull off 8-8-8 at 800MHz, this with still less than 1.7 volts. Getting to the 1600MHz (800MHz) level was not something I was expecting from a $115 set of memory. Figuring they had some more in them, I kept pushing up the CAS latency without any more voltage and finally reached 894MHz at 10-10-10-28. Pretty decent for a non performance based set of memory.