You would think because the 35 watt can run at a lower voltage and a lower temp stock that would mean it is a better overclocker than the 45 watt, but I have no idea on the history of those parts and whether that statement is true.
yea, you are not likely to be able to go to any further overclock on the 35watt chips as the 45watt. If it weren't for my Via chipset, my 2500+ Mobile would be screaming. It was screaming at 2.5ghz but unstable on my board (at least for heavy gaming such as HL2 and FarCry). Now it's at a safe and steady 2.33ghz.
more watts are going to essentially mean more components you can have in your system.
a higher-quality powersupply, such as Enermax, Antec, Thermaltake, OCZ, Raidmax... they will be better suited to provide the stability for the voltages used in overclocking. Not to mention, don't necessarily look at a PSU by its watts alone; look at the amperage level for each voltage rail. A 12v rated at 18A is crap. Don't be fooled by crappy PSU's that say 500watt yet only have maybe 18A, usually less. Those will not yield the rated 500w.
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