Neh not budget, just this board clocks 65nm quads really well

X48 is a 90nm chipset, so it's more aligned to the 65nm cpus. None the less it clocks 45nm chips really well too
Other thing is a lot of us bought this board just when 45nm chips were coming out so we already had Q6600s that have been venerable enough to not replace
If you are looking into quads go for the Q9550

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