Have other A1 owners really said that they do that? According to my experiences, cooling is essential in overclocking. I'd recommend you to be safe rather than sorry.
I've used mine overclocked G3-XE @ 933 Mhz, with the original heatsink, for a long time, without any overheating problems.
Anyway I suggest to be on the safe side and use a bigger / better heatsink.
Ciao
Massimiliano Tretene,
S o f t 3
