MAX memory on a 64 bit OS

f28ang · 08-28-2009, 02:23 AM

Hi
I am looking forward to using a 64 bit OS like Windows XP 64 bit
i was wondering wat is the max memory that i can use
i am a avid gamer so i believe that more the memory better n smoother my system work
thats the whole reason for me to go for a 64 bit OS as the normal os supports only 4 Gb

Eagerly waiting for reply
Any Info ll be helpful
Regards

Jelly Bean · 08-28-2009, 02:34 AM

Hello and welcome.

A 32 bit OS reconises 3.25 gig RAM a 64 bit OS reconises 4 gig and over.

You must remember adding more RAM your mainboard must support more RAM.

If your mainboard supports the added amount of RAM you could add 4 gig upto 8 gig I suppose.

**Tyree** · 08-28-2009, 10:59 AM

64 Bit XP drivers are very limited and often not stable.
If you want to go 64 Bit, go with Vista or, better choice, wait for Windows 7 in Oct.
4GB of RAM is more than sufficient.

Mikhalkov · 08-28-2009, 12:03 PM

Here's the theory behind it:
For 32-bit, the most RAM that can be addressed is 2^32 (in bytes)
2 ^ 32 = 4,294,967,296 Bytes
Divide by 1024,
4,294,967,296 Bytes / 1024 = 4,194,304 KB
4,194,304 KB / 1024 = 4,096 MB
4,096 MB / 1024 = 4GB

For 64-bit, the most RAM that can be addressed is 2^64 Bytes
2 ^ 64 = 1.844 * 10^19 Bytes
1.844 * 10^19 Bytes / 1024 = 1.801 * 10^16 KB
1.796 * 10^16 KB / 1024 = 1.759 * 10^13 MB
1.748 * 10^13 MB / 1024 = 1.717 * 10^10 GB
1.702 * 10^10 GB / 1024 = 16,777,216 TB
16,777,216 TB / 1024 = 16,384 PB (Petabytes)
16,384 PB / 1024 = 16 EB (Exabytes)

Obviously, there's no motherboard that can handle that much RAM, but perhaps sometime in the distant future, everyone will have 16EB of RAM.

08-28-2009, 02:23 AM	#1 (permalink)
f28ang Registered User Join Date: May 2009 Location: Bangalore,India Posts: 7 OS: xp sp2	MAX memory on a 64 bit OS Hi I am looking forward to using a 64 bit OS like Windows XP 64 bit i was wondering wat is the max memory that i can use i am a avid gamer so i believe that more the memory better n smoother my system work thats the whole reason for me to go for a 64 bit OS as the normal os supports only 4 Gb Eagerly waiting for reply Any Info ll be helpful Regards

08-28-2009, 02:34 AM	#2 (permalink)
Jelly Bean Registered User Join Date: Aug 2009 Location: Swansea Posts: 158 OS: Vista Ultimate 64 bit SP2. My System	Re: MAX memory on a 64 bit OS Hello and welcome. A 32 bit OS reconises 3.25 gig RAM a 64 bit OS reconises 4 gig and over. You must remember adding more RAM your mainboard must support more RAM. If your mainboard supports the added amount of RAM you could add 4 gig upto 8 gig I suppose. __________________ *I Try My Best.................................*

08-28-2009, 10:59 AM	#3 (permalink)
Tyree Mentor Hardware Team Join Date: May 2009 Location: Illinois Posts: 5,600 OS: XP Pro-7RC-Mandriva My System	Re: MAX memory on a 64 bit OS 64 Bit XP drivers are very limited and often not stable. If you want to go 64 Bit, go with Vista or, better choice, wait for Windows 7 in Oct. 4GB of RAM is more than sufficient. __________________ Posting your PC specs will help us to help you quicker and more efficiently.

08-28-2009, 12:03 PM	#4 (permalink)
Mikhalkov Tech Hardware Team Join Date: Jan 2009 Location: Atlanta, GA Posts: 403 OS: Windows XP SP3	Re: MAX memory on a 64 bit OS Here's the theory behind it: For 32-bit, the most RAM that can be addressed is 2^32 (in bytes) 2 ^ 32 = 4,294,967,296 Bytes Divide by 1024, 4,294,967,296 Bytes / 1024 = 4,194,304 KB 4,194,304 KB / 1024 = 4,096 MB 4,096 MB / 1024 = 4GB For 64-bit, the most RAM that can be addressed is 2^64 Bytes 2 ^ 64 = 1.844 * 10^19 Bytes 1.844 * 10^19 Bytes / 1024 = 1.801 * 10^16 KB 1.796 * 10^16 KB / 1024 = 1.759 * 10^13 MB 1.748 * 10^13 MB / 1024 = 1.717 * 10^10 GB 1.702 * 10^10 GB / 1024 = 16,777,216 TB 16,777,216 TB / 1024 = 16,384 PB (Petabytes) 16,384 PB / 1024 = 16 EB (Exabytes) Obviously, there's no motherboard that can handle that much RAM, but perhaps sometime in the distant future, everyone will have 16EB of RAM. __________________ "I have traveled the length and breadth of this country and talked with the best people, and I can assure you that data processing is a fad that won't last out the year." -1957 "Computers in the future may weigh no more than 1.5 tons." -1949 Last edited by Mikhalkov; 08-28-2009 at 12:09 PM.