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Does 64-bit actually utilize 4GB?

Post Date: 2008-07-08
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Maestro View Drop Down
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Email address used to purchase matched with forums account email.

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Posts: 56 		  Quote Maestro Quote  Post ReplyReply bullet Topic: Does 64-bit actually utilize 4GB?
    Posted: 08 Jul 2008 at 1:22am
I hear that with a 1GB video card and no memory mapping, a 4GB system will only run at around 2-2.5GB due to 1GB going to the reserved area of your video card and the other 0.5-1GB going to other stuff your computer needs. The same could be subtracted for any other video card. ( i.e. a 512MB card making you end up with 2.5-3GB left ).

Thanks.
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skyR View Drop Down
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Posts: 2220 		  Quote skyR Quote  Post ReplyReply bullet Posted: 08 Jul 2008 at 1:32am
2^32 = 4,294,967,296 (4 GB)

2^64 = 16 EB

I hope that makes sense to you...

Edited by skyR - 08 Jul 2008 at 1:40am
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Kliebor2 View Drop Down
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Posts: 659 		  Quote Kliebor2 Quote  Post ReplyReply bullet Posted: 08 Jul 2008 at 10:50am
What Sky is trying to say is, a 64 bit system can reference more memory than current technology will allow you to install in a home computer of any sort.

I run my 64 bit vista system with 8 GB of DDR2 and it references it all just fine. I see and can use all 8 Gigs and also have dual 9800GTX (another megabyte of reserverd space, plus windows overhead, but because 64 bit has room to build a memory reference table that can reference exobytes of data (more data than all the books in the library of congress hold I might add) it has no problem letting me use all 8 Gigabytes of installed system memory.

My system if I loaded up in 32 bit mode would have well under 3 gigs of memory as its maximum available.

Dave


Edited by Kliebor2 - 08 Jul 2008 at 10:51am
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