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More than 4 GBytes RAM on Socket939 system?



O. Hartmann wrote:
> David O'Brien schrieb:
> 
>> On Wed, Feb 23, 2005 at 10:21:31AM +0100, O. Hartmann wrote:
>>  
>>
>>> Will it be possible to address more than 4GBytes of RAM with the above
>>> mentioned board (nVidia nForce4-SLI chipset)?
>>>   
>>
>>
>> Yes.  If you can install >4GB RAM, the CPU+motherboard will use it.
>>
>>  
>>
>>> The limitations are settled in the chip core, I think.
>>>   
>>
>>
>> No the limitation is with the CPU, which has 40 physical address lines.
>> So you use 2^40 bytes of RAM.
>>
>>  
>>
>>> AMD64 processores only address 4 memory slots and can not address
>>> 128MBit memory chips,
>>>   
>>
>>
>> What is a 128 MBit chip?
>>  
>>
> 
> Dear David.
> I found this info on ASUS homepage for the A8N-SLI and it means (I think)
> a single IC, 128MBit x 8 organized.
> 
> Thanks for this really good news!

I guess you're implying that the memory controller on the 939 only has
enough address decode and refresh logic to drive DRAM chips of a certain
maximum size?  David, can you comment?

Scott