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Different pin layouts for DDR2?

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#1 neohelp

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Posted 01 July 2013 - 07:13

I bought some RAM online but the pin layout is different. Looking at some online datasheets they are both DDR2 and made for desktop but seem incompatible.

I say they are incompatible because the notch on the new RAM is more centered than the one on the current PC.

Here are the part numbers:

78T6453FZ0-CD5 (current)
F2-6400CL5D-4GBNT (new)

With that, Google will show information and hopefully you guys see something Im missing :)

Thank you

Best Answer MP Technologie , 02 July 2013 - 07:15

Don't mean to sound daft, but erm... did you try to flip it ? seems to me that the only problem looking at your pics is that both sticks are in the opposite direction, nothing more...

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#2 Mindovermaster

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Posted 01 July 2013 - 13:06

What board do you have? And what RAM module did you get?

 

I'm not 100% sure, but server ram (with ecc) might have a different pin-out.



#3 +Tech Greek

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Posted 01 July 2013 - 13:10

Your first part number barely brings up anything. The closest thing I could find with that part number was regular DDR, not DDR2.

 

ECC Ram does have a slightly offset pin out



#4 Aheer.R.S.

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Posted 01 July 2013 - 13:12

I've had that very same problem when rebuilding older systems, best advise I can give, is go back to your retailer, and tell them that the module doesn't fit, (if possible take the mobo with you) that way it's the retailer who will try to solve the problem for you. (At least that's what I did)

Please note, I only know how to build em, not much more than that...



#5 Astra.Xtreme

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Posted 01 July 2013 - 13:23

If you can post some pictures, we'll be able to give you much more help.



#6 +Phouchg

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Posted 01 July 2013 - 13:40

If they are visibly different (DDR2 FBDIMMs are different from UDIMMs, for example), take them back to the store - nobody can argue with that.

 

However, if PNs are correct, they, in theory, should both be DDR2 UDIMM and therefore similar :s

Are you sure you're not putting them the other way round (which is a stupid thing, but does happen to the best of techxperts)?

 

Attached Images

  • 1.png


#7 AJerman

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Posted 01 July 2013 - 13:59

The first listed, 78T6453FZ0-CD5, appears to be a part number for the actual memory chip, not the stick of memory, so it's kind of hard to compare the two numbers you gave. That memory module is used on a number of different sticks of memory.

 

Same as most people have said though. Take them both out and line them up, do they match or no? Make sure you put it in the right way, make sure neither or both are registered, buffered, ecc, etc. You can hold them pin edge to pin edge and quickly see if the pins line up or not.



#8 redvamp128

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Posted 01 July 2013 - 14:44

According to an OEM PC site for memory -

I did a memory search - and the first if you put a M in front of it .  

Seems to be Samsung OE  (Manufacturer Number)

Which it is saying that it is PC 4200  and is listed as this "DDR2-533 DIMM iMac G5, Samsung" ..

 

Hope this helps...  

 

The second number comes back as this...

 

G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBNT



#9 AJerman

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Posted 01 July 2013 - 14:51

Ahh, you're right. Add M3 to the front and it shows up as a 512 MB stick of DDR2. They both look to be unbuffered and non-ecc, as well as 240 pin DDR2. I hate to say it but I'm gonna have to also go with putting them in backwards. I don't see any reason why they would be different pin layouts.



#10 redvamp128

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Posted 01 July 2013 - 15:37

also found this-

 

511px-Desktop_DDR_Memory_Comparison.svg.

 

DDR_layout_sketch.png

 

Images found on https://en.wikipedia.../wiki/DDR_SDRAM



#11 OP neohelp

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Posted 01 July 2013 - 17:57

The pin layout is different, which is what really weirds me out!

I mean they are both DDR2........

#12 Mindovermaster

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Posted 01 July 2013 - 18:44

PIctures? Exact model numbers, not pin numbers? We can't help you unless you help us.



#13 OP neohelp

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Posted 01 July 2013 - 22:08

OK, Ill try to get some pictures tommorow

#14 OP neohelp

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Posted 02 July 2013 - 07:08

q556.jpg

There are the chips, top is the new RAM, bottom is the one in the PC currently.

Here is the motherboard:

http://www.amazon.co...n/dp/B004ZG79JK

#15 MP Technologie

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Posted 02 July 2013 - 07:15   Best Answer

Don't mean to sound daft, but erm... did you try to flip it ? seems to me that the only problem looking at your pics is that both sticks are in the opposite direction, nothing more...