Mix 800/1066 Rambus

hey..i just wondered if its possible to mix my current 2x800mhz Kingston rambus blocks with 2 new 1066 ones.
the 2 i use atm are running at 1066 also...with the fsb@133 to overclock the northwood
so i thought it would be possible, to use 2 overclocked 800ers and 2 regular 1066 at the same clockrate. can anyone confirm this, before i get them?
thx alot

I think you might run into stability problems with sticks of ram running @ different "Nanno-seconds" (ns)

hmm i see
well i think ill just get 2x 512mb sticks...if its unstable ill sell my old ones on ebay or something
i thought that (ns) thing only depends on the 2 sticks you use together in the dual bank...the th7-2 has 4 banks - so the other 2 would be independent of that?
if its fine ill go with 1,5gig ram which also isnt too bad hehe