Machine with I7 960, Mainboard DX58OG and 48Gb of RAM. The speed is 5X slower when you're with 48Gb. If you 32GB, is very fast. Have updated the Bios to the latest version.
Example: Windows loads in 20 seconds with 32Gb and 48Gb in 2 minutes. With another OS, the problem is the same.
According to the link above which is dated 03 Oct 2011, the DX58OG is rated for 24GB maximum total system memory. There may be a reason why Intel indicates such on their support website.
The type of memory is also specified. What is the spec of the memory you are using?
if the maximum is 24GB according to your link, which works well with 32?
Different information appears in this link. What would be the correct one?
Even in the README files for updating your BIOS, one of the earlier versions, reports that a change had to list 48GB.
Also, according to the link above the cpu is limited to max memory size of 24GB.
The x58 chipset may be able to run 48GB of system memory, but the board and cpu can't per the Intel links posted.
The above link is the same as the one you posted, but this one is in english and it does indicate support for up to 48GB of system memory for AA# G10926-XXX.
You should check your AA#.
However, the system memory link on that page indicates only 24GB of system memory:
The Product Guide dated Nov. 2010 indicates 24GB:
And it appears it's only been tested with 4GB memory modules in min config 12GB and max config 24GB total system memory:
With 6 DIMM slots and 4GB memory modules, that gives 24GB of system memory.
I don't see anywhere other than the link posted first, 48GB of system memory. And that doesn't take into consideration the cpu limits.
It appears your board should be able to handle the 48GB per the AA# and that one link, but the cpu is still a limit per their documents that I can find. And, every other Intel document indicates 24GB max.
It may be that it will run with more than 24GB, but not run well and within performance spec. How do you know the system can use 48GB? When you had it running, did you run any memory utilities that indicated it was using 48GB?
If I was planning on building a system with the DX58OG and the i7-960, I wouldn't plan on 48GB of system memory based on what I can read.
If you contact Intel chat support, they will likely tell you the same. Intel is very conservative when it comes to memory specs and board/cpu performance. They claim third party memory manufacturers are not complying with the available Intel hardware specs and overselling their memory.
It's interesting that Intel would indicate on one webpage that the DX58OG supports 48GB system memory and on every other webpage and in every other document indicate that 24GB is the max system memory.
Also, from what I can see, all the processors that fit the DX58OG are limited to 24GB system memory also.
It makes me wonder where the 48GB came from.
I was reading another thread that indicated Intel advertised a mobo as supporting ECC memory, but it couldn't use the ECC feature. The mobo could use either ECC or non-ECC memory modules, but no ECC function.
I find that very misleading.
"We ask our sincerest apologies for the problem experienced by a man who was clearly our mistake by having the wrong information on the website. The same has been requested to correct with the corresponding department."