Currently, i have 1 kit of these:
I had 2 kits but i RMAed 1 of them and they (the store) send it back saying all tests on the kit were OK, with zero errors but, yesterday, one of the RMAed sticks passed 12 times MemTest but the other wouldn't even boot
Yesterday, i bought 2 of these (different store) @ 102 euros each kit (look @ how much it costs @ NewEgg ...):
They should arrive in about 8 to 9 hours or so ...
With 2 kits of 2*1 GB (when all 4 were still working), the best i got was 940 @ 4-4-4-10:
Corsair Dominator DHX CL4 6400 @ 940 MHz