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Purchasing memeory for an rx7620

 
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Purchasing memeory for an rx7620

I want to add 8 Gig of memory to our rx7620 (running hp-ux 11.23). Should I just buy 8 Gig in the largest units possible thereby giving me expansion options in the future or should I purchase the same size modules that already exist in the system i.e. 1GB cards. If I do that, I've filled all the slots. Is there a real and noticeable performance hit if I mix module sizes ?

This is the current config...

DIMM Location Size(MB) State Serial Num Part Num
-------------------- -------- ------- ---------------- ------------------
Cab 0 Cell 1 DIMM 0A 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 0B 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 1A 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 1B 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 2A 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 2B 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 3A 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 3B 1024 Config ---------------- A6098-60101
Cab 0 Cell 1 DIMM 4A ---- ---- ---- ----
Cab 0 Cell 1 DIMM 4B ---- ---- ---- ----
Cab 0 Cell 1 DIMM 5A ---- ---- ---- ----
Cab 0 Cell 1 DIMM 5B ---- ---- ---- ----
Cab 0 Cell 1 DIMM 6A ---- ---- ---- ----
Cab 0 Cell 1 DIMM 6B ---- ---- ---- ----
Cab 0 Cell 1 DIMM 7A ---- ---- ---- ----
Cab 0 Cell 1 DIMM 7B ---- ---- ---- ----

Best regards,

Richard.
10 REPLIES 10
Ron Irving
Trusted Contributor

Re: Purchasing memeory for an rx7620

Hi!!

You could do it either way. If you don't want to load it up, get some 4GB module, (2 X 2GB DIMMs, hp part # AB308A.) Remember to put the higher MB DIMMs in the lower slots, (0A/B, 1A/B, etc,) and move the lower size one's down. Just adding them to the cell in the higher positions, (4A/B, etc,) can cause performance issues.

Hope this helps.

ron
Should have been an astronaut.
SUDHAKAR_18
Trusted Contributor

Re: Purchasing memeory for an rx7620

Buy memory cards of 1Gb each(A6098-60101).
already 8 slots are empty in existing cell.


Regrds,
Sudhakar

Re: Purchasing memeory for an rx7620

Sudhakar,
If I use all the slots I won't have any slots left :-)
I'd prefer to use the highest spec cards available as long as I'm not compromising performance .

Regards,

Richard.
Ron Irving
Trusted Contributor

Re: Purchasing memeory for an rx7620

Torsten.
Acclaimed Contributor

Re: Purchasing memeory for an rx7620

How about this:

16GB high-density SyncDRAM memory module AB322A

http://h20341.www2.hp.com/integrity/cache/342010-0-0-0-121.html

Hope this helps!
Regards
Torsten.

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Torsten.
Acclaimed Contributor

Re: Purchasing memeory for an rx7620

... if you need 8gig only:

8GB high-density SyncDRAM memory module AB309A

Hope this helps!
Regards
Torsten.

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Re: Purchasing memeory for an rx7620

Thanks for the info about cards. I was really after an explanation about the pay-off between using lots of cards v. fewer cards/mixed cards.

Given that the quality of the card itself was the same, would I expect to see better performance from 1 * 16GB or 16 * 1GB. Or would it depend on what sort of App I was running ?

I this case it's basically an Oracle db server.
Torsten.
Acclaimed Contributor
Solution

Re: Purchasing memeory for an rx7620

The memory modules for this servers are "quads" - 4 dimms are 1 module.

the 8GB module consists of 4x 2GB dimms.

4GB dimms cannot be mixed with other modules.

In general many dimms = best performance

see also

http://h18000.www1.hp.com/products/quickspecs/11848_div/11848_div.HTML

for Memory Configuration,
Memory Loading Rules and Performance Tuning Guidelines


Hope this helps!
Regards
Torsten.

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Re: Purchasing memeory for an rx7620

Excellent Torsten,

That doc is really useful.

If I got rid of the 8*1GB DIMMs and replaced them with 4*4GB DIMMs do you think I would see much difference in system performance due to using only half the slots that were being used previously ?
Tim Nelson
Honored Contributor

Re: Purchasing memeory for an rx7620

IMHO.. Unless you are running an app where every single nano second counts I do not think you will notice any performance impact of the DIMM selections or mix.

You must, of course, follow the memory loading rules either printed on the chassis or in the user-guide for that server model.