Good memory, but needs to be overclocked ...

Have the memory set to defaults, ie manual selection of 1066 MHz in the BIOS and memory voltage to 2.2 volts (the timings are and work to "Auto"). Operate 2 pair, so together 8 GB in dual-channel mode, BS is Windows 7 Home Premium 64 bit and motherboard is an ASUS P5Q Pro. Together with a newly attached HDD Raid 0 the PC was then also very fast, unfortunately there were repeated crashes in the form of "blue screens" and each subsequent restart.
When troubleshooting, I then made me sometimes to the memory voltage and this increased from 2.2 to 2.4 volts. And lo and behold: Everything is going very fast and stable, not a single crash since more weeks. So it may have been due only to the memory voltage, even though the motherboard supposedly more likely to slightly higher than the set voltage values ​​tends. Possibly this trend disappears when RAM, too, if all 4 memory banks are beselegt.

I forgive only 4 stars because I was indeed prepared to push a 6400er memory according to manufacturer specification on a 8500. The memory then, however, even after compliance with the requirements is not running and (even further) must be overclocked, I find wrong. Is also the first time I happened to Kingston HyperX memory; had various memory modules in different computers. Apparently, the specification is pretty maxed out here.

So who (insbesonder under Windows 7 or 64-bit) has problems to purchase this memory, this may possibly simply eliminate a slight harm the voltage (+0.2 volts with me about Kingston-Spec.).