64 bit and only 3 gigs of ram?

I thought to fully take advantage of 64 bit and 64 bit applications. one would need to have at least 4 gigs of ram?? this 3 gig limit just makes no sense to me. oh well, I guess I'm sticking with my 32 bit MBP for now. or is there something that I should know?

Why would we have to wait for Santa Rosa when Dell XPS laptops using the exact same Core 2 Duos are capable of supporting 4GBs right now?
I'm in the unique position of having a "do-over" with regards to my laptop, I was able to sell my MBP for just a hair under what I bought it for, and am ready to buy a C2D MBP, but this RAM issue (along with the reported "haziness" in the LCD that I can't tell if it's really an issue or not) is getting me to second guess whether I'm going to go Apple again.

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    No solution from me, but I just wanted to chime in because I have the same problem and I'd like to explain it in detail. I've actually had this problem with Vista 64-bit (6GB of RAM) for the past 2 years. It's a very flaky/random problem, where about 40% of the time the microphone worked fine, 20% where I would get minor crackling (turns my voice into a robot voice), 20% with MAJOR crackling, and 20% where the microphone didn't work at all. When it would either crackle or stop working, I would usually restart the computer. After the computer booted up again, it would work fine 95% of the time (I very rarely had to reboot it twice in a row). However, it would randomly change states (between the four listed above) throughout the duration of the computer staying on. And, it would usually progress in the direction of "being more and more broken". For example:
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    - enable Memore Hole in BIOS Setup, if?your motherboard supports the setting
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    Quote
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    On Fri, 24 Oct 2008 12:06:53 -0700, [email protected] wrote:
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