I had some Hz's that I could not get stable on two different boards, one a DFI and the other a MSI. I Spoke with the GS Tech after about a week of testing. He had me try some settings and then said I needed to RMA the ram. I informed him that I paid for overnight shipping on this item. He stated that as long as I include a reciept showing the overnight shipping that he could ship them back overnight. So I shipped out my ram and spoke with the tech after they were delivered to G Skill. He stated that the ram was fine and had no issues. He stated due to the ram testing ok that they could not ship it back overnight as promised by the tech before the ram was even sent back to G Skill. The G Skill tech is the person that informed me that I had to do an RMA, he informed me they would ship them back overnight. However once they received the ram they did not go through with what they promised. This is very poor service if you ask me. I mean if you cannot ship them back overnight then do not inform me that you can. The tech informed me he ran them for a "couple" of hours using memtest and they were fine. First of all 2 hours of memtest is not going to cut it, I mean come on now. Second, did the tech even prime? The answer is NO. Even if the memory is memtest stable that does not mean that it is prime stable, period. I received the ram back and still cannot get the ram prime stable at 250, the rams rated speed. I contacted the tech again and let him know about this issue. He did not even attempt to help me, he only suggested another RMA. Like I want to wait for another RMA for some more BS from them. I know it is not any of the boards, on the DFI I have had some Crucial ram at 285, and at 270 on the MSI board. How can G Skill recommend their ram for DFI boards if the techs cannot even help you properly when needed? You say DFI Expert to one of the techs and they stop right there. Seems like some pretty poor service if you ask me.