Hello everybody !

I'm not new to rme products and use various pci version quite Often.
Last friday ,after years on a pc (With rme 96/52) I got myself
a shiny new mac pro quad, I loaded it with two more hard drives for samples and project.
Than , a rme 400 and a 800 to 400 cable.
Installed and updated everything to it's latest state
not including logic which I left at9.1.1
I started a new project, loaded and tryd all kind of logic and 3rd party AU
and when jaming with drum synths I noticed a little latency when playing,
it's not aloy but defenetly there , I tryd lowerig the latency buffer In logic from 256 down to 64
and it was a bit better but still a tiny little latency,
I dialed in the "low latency mode" in logigs audio prefrences
and still , tiny little annoying latency...
I have to say that even my crumbling 5 year old pc running xp with cubase 3 never had any issues with latency what so ever.
The 96/52 latency was always set to 256 and I never feltbany need to lower it,
drums were in time, I feel like I'm missing something importent
please rme gurus please show me the light

thanks ahead