Ram limitations, 64 boot boot up

Hi
I've just be told on another thread that Mac Pro's from 2006 to early 2007 can't use more than 3gb of RAM and can't boot up in 64 bit mode.
I have 5 gb of RAM which the computer knows about and is there in Activity Monitor, so I assume it's being used.
However, I can't start up in 64 bit mode (I've been told to hold the 6 and 4 keys down when restarting).... Nothing happens, it just says in system infor that the 64 bit kernel isn't running (or something)....
My Mac is a Mac Pro 1, 1 if that means anything to anyone!
So is my beloved Mac a loser or not??

I've got a 2007 MacPro with 16 GB of RAM. No it won't boot into the 64-bit kernel. No single instance of a 32-bit program can access more than 4 GB of memory. 64-bit programs have access to the entire 16 GB. However, not many 64-bit programs out there need access to more than 4 GB (although there are some out there). I do use BitVice (32-bit program) for compressing video for DVDs and it launches 8 instances and uses over 12 GB of RAM in doing so.
I wouldn't say the older Macs are losers. By the time the older Macs do become 'losers' it'll be well worth upgrading to a newer Mac anyway.

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    William Rivas wrote:
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