I found some web data suggesting that there is 135mm between the motherboard and the case, givng me approximately 130mm from chip to case. Thus allowing the placement of a zalman cnps9500 (logical that they would make a CPU cooler to fit there own cases).
Looking at ths silenx ixc-92ha2 cpu cooler giver a max db rating 24db, but reading into the specs I can see that they have acheived this by limiting fan rpm speeds to 2000rpm thereby giving a maximum tr (thermal resistance) of 0.12C/W whereas I can see that the equivalent zalman with fan speeds of upto 2650rpm and 27.5db can produce a tr of 0.16C/W. A quite substantial difference!
Can someone with superior knowledge let me know if this extra thermal resistance is worth having at the expense of noise? Also whether even the zalman provides enough cooling power to maximise the efficiency of my system whilst minimising noise?