Solved How closely does new RAM have to match?

Hewlett-packard / Dc7900
June 15, 2020 at 04:48:28
Specs: Win 10, Celeron g540T/4GB

My fairly modest system is used mostly as a home office machine and is OK enough for what I need (office stuff, email, web - the usual, really. No heavy gaming).

My question relates to RAM. I think that generally speaking Windows 10 works best with 8GB (my system would take 16GB but given that its CPU cannot be changed that seems like overkill) so I'm looking to push it up to that. It currently has a 4GB module (DDR3/1067) in one slot with the other empty. I know it is best to keep module sizes the same and it's best if possible to have them of the same batch, manufacturer etc. Is it best therefore to just buy 2 x4GB new, or can I try and match the one I have? I know it is a Samsung branded module and can get the other info and so on from CPU-Z, but is that close enough - I won't I guess find one that was made at exactly the same time/batch. Do I worry too much?

All help greatly appreciated.

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June 15, 2020 at 05:14:11
✔ Best Answer
Find out the specs of your current 4GB stick & then search for a close match. The new stick doesn't have to be from the same manufacturer, but it should be the same speed, voltage, & CAS rating. This link to Crucial should be useful. You don't have to buy from there but it should help to determine a match.

You can also use CPUZ to find the specs of your current RAM.

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June 15, 2020 at 05:48:03
That's great - thank you. I am though still a bit confused.

I ran the crucial tool and the item in suggests is

I know very little about voltage, CAS ratings etc, but they seem quite different - CPU-Z reports mine as 7 clocks (CAS latency CL, tRCD and tRP) and 19 (tRAS) on its memory tab and then a lot of other stuff on the SPD tab on the Timings Table - JEDEC#4 and so on. Also says 1.50 V whereas the crucial tool says 1.35.

Huge apologies if I am being an idiot!

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June 15, 2020 at 09:58:35
Better others answer your questions as above... But remember the only idiot in the room is the one who won't ask a question in order to learn and understand something new (to him/her).

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June 15, 2020 at 11:25:01
You're not an idiot. As mentioned, best to ask if you don't know. If you can get it from Crucial, then do so. Never had any problems with any RAM that they sold.

"Channeling the spirit of jboy..."

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