Wierd overclock conundrum

[Grminalac]

Ok So I slap in my Barton 2500+ set the FSB to 400Mhz. I keep the Memory clock 133 (266) because thats what I had it set as before. i have Kingston 2700 speed. No problem she purrs like a kitten. I play all my games everything no hitches. So I bump the memory up to the rated speed 166 (333) and now blue screen after blue screen. Very strange because the memory isn't overclocked at all. Just to test things out i clock back the BArton to default speeds and set the memory clock to SPD (166 333 CL2.5) and still I get blue screen and reboots. I'm thinking this memory might not be up to snuff. I am hoping Kingston will replace it for me. I'm not exactly pleased that the cpu can be overclocked 25% yes the memory will not even run stabily with the cpu speed set at default.