Tom's Hardware > Forum > Windows Vista > Vista General Discussion > So why the cap at 8GB Virtual Memory?
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TheMaverick   12-26-2007 at 03:15:30 AM

Running Vista Ultimate 64bit. Curious as to why the capped it at 8GB considering 64bit means you should be able to address what like 16 Terabytes?

I know windows server you can buy the different packages and that will give you options of up to I believe 64GB of RAM.

I'm just curious as to why there is a cap at all if it's capable of reaching 16 Terabytes of Ram. Obviously I've no intention of putting 16TB of ram in here just wondering.

XP lasted atleast 5-7 years I believe. So in 5-7 years I could see the need for 8GB of ram hell Bill Gates once upon a time was quoted 256KB of ram was more than anyone would ever need. Assuming it takes them another 5-7 years to give us another OS this seems a bit odd. Think it will be something they just release an update for... "Here download this patch, it's allow addressing of 16GB" ??

------------------------------ AMD XP 1900+/XP 2500+/XP3000+/X2 4600+/X2 6400+
MS-6380E/A7V333/A7V600/A7N8X-E/M2N32-SLI
Geforce4 Ti4600/Ati 9700 Pro/Ati X1600Pro/Ati X1900 GT/Nvidia 7950GT/Nvidia 8800GTS G92 512MB
PC2100 512MB/Corsair TwinX DDR400 512x2/Corsair 2Gig DDR2-800/Corsair
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badge   12-26-2007 at 05:53:26 AM
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Simple answer...the MB chipset wll support 8GB's, no more.

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TheMaverick   12-26-2007 at 06:48:31 AM
- 0 +

Very cool, so MB's with 16GB support such as the new Gigabyte will be able to support 16GB or will it be limited from Vista?

------------------------------ AMD XP 1900+/XP 2500+/XP3000+/X2 4600+/X2 6400+
MS-6380E/A7V333/A7V600/A7N8X-E/M2N32-SLI
Geforce4 Ti4600/Ati 9700 Pro/Ati X1600Pro/Ati X1900 GT/Nvidia 7950GT/Nvidia 8800GTS G92 512MB
PC2100 512MB/Corsair TwinX DDR400 512x2/Corsair 2Gig DDR2-800/Corsair
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badge   12-26-2007 at 07:28:20 AM
- 0 +

I believe so. But there are only 4 DIMM slots on the board and no 4GB DIMMS available.


Message edited by badge on 12-26-2007 at 07:29:22 AM
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TheMaverick   12-26-2007 at 05:39:58 PM
- 0 +

True, couldn't imagine needing 16GBs of ram anyways. However that day will come sooner than later.

Thank you for the info.

------------------------------ AMD XP 1900+/XP 2500+/XP3000+/X2 4600+/X2 6400+
MS-6380E/A7V333/A7V600/A7N8X-E/M2N32-SLI
Geforce4 Ti4600/Ati 9700 Pro/Ati X1600Pro/Ati X1900 GT/Nvidia 7950GT/Nvidia 8800GTS G92 512MB
PC2100 512MB/Corsair TwinX DDR400 512x2/Corsair 2Gig DDR2-800/Corsair
 Reply to TheMaverick
dengamle   12-26-2007 at 09:28:29 PM
- 0 +

In the title you say virtual memory. Do you mean virtual address space or physical? The virtual address space is something inside the cpu, not the chipset

The specs i've seen on microsoft.com says 8TB for user space,and 8TB for kernel space

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Anonissimus   12-26-2007 at 10:15:47 PM
- 0 +

well if I remember right 64bit systems allow adressing of 16 exabytes of data, so the dimms and mobos will move along. Currently there is 128GB supported for servers... correct me if I'm mistaken

Reply to Anonissimus
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