[Info-vax] OpenVMS I64 V8.1 "Evaluation Release"?

[Johnny Billquist]

On 2012-03-22 11.23, Fritz Wuehler wrote:
>> And to add...
>>
>> You couldn't cool it and given the current density of DIMMs, I don't think
>> there is any memory interface that can host that many DIMMs at any transfer
>> rate.
>
> You guys are getting a little off track. The comment was no CPU today can
> address 64 bits of physical RAM, which I don't believe is true. You guys are
> trying to go and explain why you don't think it's practical but the question
> wasn't whether it's practical or not. And I don't believe z/Arch uses DIMMs
> anyway so this comment is anyway not a response to Glenn's comment on my
> disagreement with the statement that it's not possible to address 64 bits of
> physical memory with any current CPU. It certainly is possible to do that on
> z/Arch and probably others. From a practical standpoing there's no point
> arguing with me since I haven't seen any benefit to z/Arch over S/390. Just
> more marketing baloney.

No, the z/Arch, even in its latest implementation, does not give you 64 
physical address pins out of the CPU, so no way you could hook up 2**64 
bytes of physical memory.

Sorry, not even close. 512 GB, or 2**39, is where the latest z/Arch 
machine implementation (z9 EC) is at.

	Johnny