Memory amount vs. memory speed?

idata — Sat, 04 Sep 2010 12:56:40 GMT

Could not find the answer for the question:

How is memory access organised in Nehalem 5500/5600 series.

Well, the documentation says that the processors have 3 memory channels, each supporting up to 3 memory slot, with up 8-rank memory modules (with up to 48 ranks in total).

Also you have 1333MHz memory speed with up to 8 total ranks, 1066MHz with up to 24 total ranks, 800MHz with more and max 1066MHz with 8GB / 800MHz with 16GB modules

And that is tho whole info I could find. But this is not adequate!

Sample question - now there are 2GB 4-ranks modules and 4 rank 16GB modules - will both run at 800MHz if 12 modules are intalled?

Really I'd like to get the answer for the following - which way the memory is adressed and reached.

Is it spanned across banks/ranks (bank1 rank1 - bank2 rank1 - bank3 rank1 - bank1 rank2 - bank2 rank2 ...) or some other way?

When it is possible to read/write the next rank of the bank (after 7-9 clocks or after 20-22 clocks or more)?

I want to understand the dependance of the amount of the memory installed on the real memory speed.

In workstation applications the big RAM-drive is a great help, but if it decreases system number-crunching performance, may be it ai more wise to have it on an axialary server?

Re: Memory amount vs. memory speed?

idata — Fri, 17 Sep 2010 12:30:54 GMT

Hello,

Check this link

/community/openportit/server/blog/2009/05/05/nehalem-memory-help-im-lost [+++]

Any further question, may be you can ask the author of the blog.

All the best,

Kind Regards,

Aryan.

/poll.jspa?poll=1129 Voting Poll

Re: Memory amount vs. memory speed?

idata — Fri, 17 Sep 2010 12:47:22 GMT

Thanks, but that's just the same info as in Intel documentation.

Should say that memory usage for 7500 Xeons is described much better.

topic Memory amount vs. memory speed? in Mobile and Desktop Processors

Memory amount vs. memory speed?

Re: Memory amount vs. memory speed?

Re: Memory amount vs. memory speed?