I haven't played with 0501 but I don't believe it adds anything to do with RAM timing.
I can tell you however that if you use the Kingston Hyper-X FB-DIMMs, they will die. At one point I had 4 sticks in my machine--all are now dead. So if you do buy Kingston Hyper-X FB-DIMMs, buy them from some place that sells them as new and gives you a receipt. Kingston will only refund the original purchaser of the RAM. They no longer have spare sticks for replacement.
Right now I am using 2x 4GB sticks of Kingston's KTA-MP800K2/8G, and I have put Hyper-X heatsinks on them for improved cooling. Works great.
Honestly I wouldn't spend too much--scratch that, any money on a Z7S build, because, well, read this thread.
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