Any 939 MB out there that support over over 4GBts?

jc717

Junior Member
Mar 25, 2005
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Like the subject says... Are there any socket 939 motherboards available that support over 4Gigs of ram? Are there any in the works?

Thanks,

JC
 

jc717

Junior Member
Mar 25, 2005
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Bump.

Do you guys know if the 4 GIG limit is a limit of the 939 pin chips or is it just a choice that MB makers seem to make?

With 2 GB dimms available, it's too bad that no one's making a board that could make use of 8Gigs.

JC
 

ts3433

Platinum Member
Jun 29, 2004
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I think (though I'm not sure) that on dual Opteron boards they only let you have 4GB for each CPU, so it might be a limitation of the memory controller (on the CPU, in this case).

Aside from that, what the heck uses more than 2GB of RAM that you'd run on a consumer-level machine anyway?
 

KF

Golden Member
Dec 3, 1999
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Something I read in the AMD specs, which was not that clear, indicated that the memory controller on the Athlon 64 chips only supports up to 4G. I believe Opterons and maybe FX chips support more. I think you need registered memory, not the normal unbuffed stuff, for Opterons. IAC AMD does brag up the amount of memory Opteron servers can use, and they use numbers like 256G.

Since normal Home Windows runs in plain 32 bit mode, you can't access over 4G. In fact 2G is reserved for OS use (like virtual memory) so any one program can't use over 2G. Server Windows is probably different, and uses a paging scheme built into x86-32 bit to get to over 4 G, and Windows 64 bit is definately different. In 64 bit Windows, every 32 bit program will be able to access 4G, and of course 64 bit programs can access more. But that's assuming the mobo can take over 4G. Otherwise, over 4G will be virtual memory.
 

jc717

Junior Member
Mar 25, 2005
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Originally posted by: alkemyst
For what reason?


I'm running analysis on some pretty sizeable datasets. It's painfull to watch once it starts paging... I could go with a dual opteron setup, I know that the Tyan dual boards support up to 16Gigs. But Opterons require registered ram, and that stuff is pretty expensive.

Ideally, I'd like to put together a 939 FX or Athlon 64 system with at least 8 Gigs of RAM and then upgrade to the dual core 939 chip that's supposed to come out later this year.

Yes, I know that Win 32 bit only supports 4 gigs max, but WinXP64 will be out next month.

Thanks for the input.

JC
 

jc717

Junior Member
Mar 25, 2005
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Originally posted by: keeleysam
It's a limit of the operating system, not the mobo.


Every socket 939 MB I've seen has a 4Gig or less RAM limit listed in the specs, that's why I'm asking if a board exists that supports more.
There are plenty of 64bit Linuxes and WinXP64 will be out next month.