In tests inside case SI-120 has worked quite nicely and better than XP-120
Also difference to SI-128 shouldn't be ground breaking and with fan at lower speed difference gets slightly smaller which would be logical considering more densely packed fins.
EDIT: Found one shop listing SI-128 and shop would have also some other components I'm looking for. (delivery cost for for just HS would be too high from Germany)
So real world cooling capability is definitely much more complicated than plain weight or amount/surface area of fins and such.
With lower weight of Thermalright (<400g) compared to TT (>800g) I'm more inclined getting it.
And I think getting Conroe to produce as much heat as overclocked CPUs in those tests would require some extreme overclocking.
At least any HSF designed to handle fastest processors of very ineffective NetBurst "Sauna stove" (*) architecture is propably more than enough for even heavier Conroe overclocking, after all TDP for 2,93GHz X6800 is 75W while for 2.4GHz E6600 it's 65W.
* I like -20C winter temperatures... but in sauna I prefer +100C.
but I really don't trust TT very much.
Well... I happen to remember review of top of the line TT PSU few years back... at low loads efficiency was under 60% and and at higher loads it rose to royally high 66-67%. Now how's that for good first impression of product?
I would say stick with the stock hsf, because of the huge potential for damage using heavy aftermarket heatsinks.
You mean coolers like Zalman 7700Cu at >900g which happens to be in current PC?
And I've twice had to move case around and take mobo out of case with it because of changing that damned chipset cooler/fan in Asus A8N SLI.
(No more active chipset HSFs to this house, at least from Asus!)