Intel Xserve panics with 667Mhz RAM

I have an 2x dual core 2.66Ghz Intel Xserve running 10.4.9
Currently it is running with 2 x 2Gb "533Mhz" ECC DDR2 FB-DIMMs
This it has been stable with and has been running for 5days without any problems.
However if I install into the machine 667Mhz ECC DDR2 FB-DIMMs, then the server panics approx every other day or more. I have tried running with Apple supplied RAM and Kingston (who I believe are a supplier to Apple).
I only fitted the 533Mhz RAM out of desperation to try to get the system stable and it seems to have worked.
Does anyone know if there any issues with running 667Mhz RAM in the Intel Xserves.

Is the RAM module "known good"?
At least before you handled it?
Does it do it with ALL 667s or is this the only one you've tried?
Will it pass a Memory Test when installed? Even when warm?
My $.02,
=Tod

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Intel Xserve panics with 667Mhz RAM

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