???

The ram I bought is some value ram by Mushkin. I can turn the cas lat down to 2.5 if I only use 2 sticks, but with all four I have to keep the cas at 3 unless I want to run at DDR333 which is a little bit of a bog down. All four sticks are double sided, and according to MSI, and OCZ which I have been in touch with to get better ram, with double sided memory, the motherboard should never perform about DDR333 with 4 sticks installed. Well, I can get DDR400 out of four sticks of double sided memory with CAS3 which that is what the ram is rated anyway, so I guess what I want to know is, how is it possible that I am getting DDR400 when I was told specifically that it can't be done with 4 sticks of double sided memory.