Re: [PLUG] Can I use these 2 sets of DIMMs together?

Mixing DDR3 and DDR3L isn't generally a problem. The original JEDEC spec for DDR3 mandated a default 1.5V for signalling, with +/-10% being acceptable and required, as with most voltage specs in a PC. DDR3L allows signalling explicitly at 1.5V or 1.35V. This enables machines equipped with only DDR3L to default to 1.35V signalling and save a few watts. In a mixed case, your DDR3L is getting more voltage than it wants, but it's still in spec, won't cause problems.

DDR4 has a similar thing, the baseline spec mandates 1.2V signalling and 1.35V (and even 1.5V in extreme cases) is available via XMP profiles. Eventually I expect to see DDR4L modules at 1.0V or 1.1V signalling. This generally happens later in the lifecycle of a standard, as yields improve.

On Sat, Aug 29, 2020 at 5:32 PM Keith C. Perry via plug <plug@lists.phillylinux.org> wrote:

Glad it worked out Walt. 'Definitely didn't sound like it would be an issue after your second email.

Also, AMD for the win :)

On August 29, 2020 4:02:55 PM EDT, Walt Mankowski via plug <plug@lists.phillylinux.org> wrote:

Well, I decided to give it a try and it seems to have worked just
fine.

Walt

On Sat, Aug 29, 2020 at 03:16:24PM -0400, Walt Mankowski via plug wrote:
Thanks Keith,

I think I must not have been clear. My box currently has 2 x 8 GB DIMMs and 2 empty slots. I bought 4 x 8 GB DIMMs. If I can use them together, then the box will have 4 x 8 GB DIMMS (2 old DDR3L and 2 new DDR3). I'll return the other 2 x GB DIMMs and get back about $60.

Walt

On Sat, Aug 29, 2020, at 3:08 PM, Keith C. Perry wrote:
I just recently retested my thoughts on this for a workstation I have to George, so for what it is worth...

The best case scenario is of course to use the same spec memory in all slots- (trivial solution I know but said for the record).

Barring that, the next more important thing is to use the same pairs and then the same speed memory.

I would check to make sure your motherboard can use a 2 x 8Gb and a 2 x 16Gb kit but would think it would work.

Doing a memory test before you install the kit and after you install the kit will tell you if you are degrading performance with the new kit.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Keith C. Perry, MS E.E.
Managing Member, DAO Technologies LLC
(O) +1.215.525.4165 x2033
(M) +1.215.432.5167
www.daotechnologies.com

*From: *"Walt Mankowski via plug" <plug@lists.phillylinux.org>
*To: *plug@lists.phillylinux.org
*Sent: *Saturday, August 29, 2020 2:47:58 PM
*Subject: *[PLUG] Can I use these 2 sets of DIMMs together?

Hi,

I went to Microcenter today and bought some RAM, with the intention of upgrading my Linux box from 16 to 32 GB. I thought I had 4 4-GB DIMMs so I bought 4 8-GB DIMMs. But when I got home and opened up my box, I discovered that what I actually had was 2 8-GB DIMMs and 2 empty slots. My question is whether I can use 2 of the DIMMs I just bought and return the other two.

Here's what I currently have: https://www.crucial.com/memory/ddr3/ct2k102464bd160b/ct8966767

Here's what I just bought (2 packages): https://www.microcenter.com/product/509757/neo-forza-encke-16gb-(2-x-8gb)-ddr3-1600-pc3-12800-cl11-dual-channel-desktop-memory-kit-nmud380d8116cc2---gold#

The specs look identical as far as I can tell. I'm a bit worried about the heat sink on the new DIMMs but they look like they should fit.

Thanks.

Walt
Philadelphia Linux Users Group -- http://www.phillylinux.org
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Philadelphia Linux Users Group -- http://www.phillylinux.org
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General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug

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