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Old 08-21-2008, 10:48 PM   #1
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Default DIMM and UDIMM

please, can somebody tell me if DIMM and UDIMM are compatible?
I'm trying to upgrade my memory, but for some reason the new RAM memory I bought this afternoon won't work with the slot I already had. Separately there working just fine, but my screen won't give any response when I try to start up my computer with the two of them. I'm wondering whether this could be a compatibility problem between DIMM and UDIMM, because the new memory I bought is UDIMM?
Please help, 'cause I'm getting pretty frustrated over here...

Thanks
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Old 08-21-2008, 11:44 PM   #2
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right off you mixed two different types of memory which essentially is a "no no" there. The fact that both work with only one dimm in means both are compatible but not with each other as one cancels the other out.

Whenever adding more memory or replacing memory you first want to match what you already have installed as far as type and generall speed but certainly timings and type to avoid problems. Now you have to choose which you will keep in and add more of that particular type hopefully identical.
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Old 08-22-2008, 12:52 AM   #3
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pc eye, have you googled that?
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Old 08-22-2008, 01:29 AM   #4
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pc eye, have you googled that?
Sounds like something you would do. I don't use Google in the first place. But then you wouldn't post anything useful and subject related anyways.

You'll have to excuse the interruption sean2008 since some lack any common courtesy and would rather spend time trashing threads.
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Old 08-22-2008, 01:51 AM   #5
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I'm not trashing. It was a hint.
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Old 08-22-2008, 01:56 AM   #6
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Other PC eye sayings.

Its a typo - misunderstanding - dont get it - missed something - In other words - I meant another chipset - I was explaining something else - keyboard key stuck - tombstones - some kinda of DDR support on the XP 3200- extra wide IDE cables - uninstalling USB drivers will crash windows - The 8mb. of unallocated space is a flaw in windows setup - change the subject - hijacking threads - slander attack.
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Old 08-22-2008, 02:05 AM   #7
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Quote:
Originally Posted by sean2008 View Post
please, can somebody tell me if DIMM and UDIMM are compatible?
I'm trying to upgrade my memory, but for some reason the new RAM memory I bought this afternoon won't work with the slot I already had. Separately there working just fine, but my screen won't give any response when I try to start up my computer with the two of them. I'm wondering whether this could be a compatibility problem between DIMM and UDIMM, because the new memory I bought is UDIMM?
Please help, 'cause I'm getting pretty frustrated over here...

Thanks
Tell me what so called UDIMM and DIMMS you have and what motherboard they are on. UDIMM just means unregistered.
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Old 08-22-2008, 07:59 AM   #8
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My motherboard is ECS RC415ST
It's an Intel Pentium D 915
I want to have 2GB of memory on there.

But are you saying that they should work together? That there's no real difference between UDIMM and DIMM?
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Old 08-22-2008, 08:03 AM   #9
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Oh I forgot,
the memory I already had is DDR2-667 MEADR422LA4701
the new one is DDR2-667U MEADR422LA4701-08A6
they're both pqi
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Old 08-22-2008, 09:55 AM   #10
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DIMM is just the generic name. You have UDIMM, RDIMM, FBDIMM, SODIMM, etc.

UDIMM is what people in general use in their desktop pcs.
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