4GB DDR2 667Mhz ECC SoDimm memory modules?

Does anyone know of a memory manufacturer that makes 4GB DDR2 sodimm memory sticks with ECC? I've found non-ecc, but just curious if 4GB ECC memory exists in that capacity.

 

No ECC laptop memory exists. And besides, it wouldn't be compatible.

 

I have never seen ECC one for laptops either

 

Hi,

I came across this thread while researching essentially the same question, and thought I'd post here what I found, in the hope some people may find it useful.

There are in fact several manufacturers of ECC SO-DIMMs. Such DIMMs are correctly referred to as SO-CDIMM, and your favourite search engine should provide plenty of links if you look for SO-CDIMM. On the downside, these items are intended and priced for an uncompromising professional market, and cost $200-$300 per G, except that I just came across an ebay listing that (as of posting date) offers 1G modules at $50; look for SG572288FG8CWDGME2 (I have no connection with the seller). I have ordered two modules in the hope they'll be what I want.

An entirely different issue is motherboard support, but I have seen it claimed that all AMD Opteron derivatives do support ECC even if disabled in the BIOS, given that their MMU is on the CPU chip. Hence, on Linux ECC can be forcibly enabled, though mileage may apparently vary.

I'll report back later.

Best,

-- Per

 

This is very interesting and will be watching any updates you post on this issue.

Do you have any applicable information for Intel based platforms and ECC memory?

This becomes increasingly important as we can now have 32GB+ RAM on our notebooks...

 

[Correction: The item on top is a 244-pin Mini-DIMM, not an SO-CDIMM. See later post.]

Hi,

I can now report that unfortunately SO-CDIMMs are an entirely different form factor. I'm a bit puzzled that none of the sources I originally found mentioned this, but there you have it.

SO-CDIMM | Flickr - Photo Sharing!

SO-CDIMM on top, regular SO-DIMM on bottom.

If anybody ever finds a laptop that supports SO-CDIMMs I'd love to hear about.

Best,

-- Per

 

Probably servers only. All of the mobile workstations I know use SO-DIMM.

 

Just to save a little time and cut the suspense. You will never ever and I mean ever find a notebook that will handle these. I will go so far as to say you will also never see in a consumer desktop. You have increased cost and reduced performance that offers a level of stability that is just not needed. So what is the motivation?

I guess I do get it would be interesting but it would be like teaching an elephant to parachute. It just makes zero practical sense.

 

For sure a real mind trip for the elephant, especially if done cold turkey!

 

Well, if the elephant had aspirations of space travelling... learning to parachute would be a good first step, huh?


HEY!!! I can turn with my ears!!!

 

Correction to myself! The photo shows in fact a Mini-DIMM on top; it had been labelled as a 200-pin SO-CDIMM, but is a 244-pin Mini-DIMM.

So there's still hope, the point being that AMD's Opteron and (at least some) post-Opteron processors do support ECC (they have on-chip MMUs). They're simply not made without ECC support, but it has to be enabled by BIOS or forced by the OS (which Linux can do). Here's a link to the CPU in my laptop:

AMD Turion 64 Mobile Technology

There are still two stumbling blocks, though:

1) Are SO-DIMMs and SO-CDIMMs pinout compatible (with the pins for the ECC bits just dead on SO-DIMMS)? I think so, there's no good reason they shouldn't be, they have the same shape, size, and pin count.
2) Has the motherboard manufacturer made traces for 72 data bits? That is probably less likely and could be very variable.

If I find SO-CDIMMs at a reasonable price I'll update here.

Cheers!

-- Per