Hey,
thank you
i borrowed the sticks from @ground1556. in his p5q deluxe they did 690MHz and 720MHz 5-5-5-15 at 2.3 Volt in single channel respectively .
I tried to run them in dual channel with several boards (P5Q Pro, EP45 UD3R) but when the cpu is close to maxxed (still stable, just high FSB, around the 500 mark) the sticks couldnt go over 590MHz.
When lowering FSB from ~490FSB to ~420FSB they suddenly could do 690MHz 5-5-5-15 2.3V SPi8M stable in dual channel.
I then tried to up FSb to 500, drop the mem multi down so itd be at 666MHz with same timings and voltage and the system didnt even post.
After that i tried to see with what FSB each stick can boot on its own and i stopped testing at ~520 FSB. i dropped the multi down so the mem ran at 520MHz
so, my conclusion is, that (this) ddr2 cant clock as high with a higher fsb
have you observed similar things?