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Portrait of a Young Man as The Artist
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hubersbernd From: hubersbernd Date: September 16th, 2008 08:57 pm (UTC) (Link)
There is also the OS restriction. XP 64 bit will only allow you to see 3.25 Gb RAM.

Also, XP will show you the 4 Gb, but not address them.

(Historically XP architecture reserved the 3.25-4.0 Gb space for video and that fancy stuff...nobody ever needed it).

Window 2003 same issue. Need DC or Enterprise Edition to go beyond the 3.25 GB hurdle...
From: thegelf Date: September 16th, 2008 11:44 pm (UTC) (Link)
Nope, no OS restriction, at least not with XP 64. Can't talk about Windows 2003 Server, haven't used it. XP 64 bit will show you as much ram as your BIOS lets it. I've run XP 64 bit with 32 gigs of RAM, and been able to see and address all of it. I've also run it with 4 gigs, and had it only see (and address) 3.5 of them. If you have XP 64 and aren't seeing all your ram, blame your BIOS, and see if there's an update for it (or an option to switch between 32 and 64 bit addressing). And it's the BIOS that has the 3.25-4.0 GB space reserved, which yes, people do need. You have an AGP/PCI X video card? Your processor is addressing it in that range. You have any PCI cards slotted? Your processor is addressing it in that range.
18 comments or Leave a comment