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Different pin layouts for DDR2?

26 posts in this topic

Posted

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

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Posted

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.

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Posted

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

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Posted

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...

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Posted

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

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Posted

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)?

 

post-382760-0-37712900-1372685742.png

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Posted

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.

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Posted

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

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Posted

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.

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Posted

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

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

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Posted

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

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Posted

OK, Ill try to get some pictures tommorow

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Posted

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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Posted

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...

Maybe I did not try it because of the sticker :p I feel like I should be nominated for a Darwin award if its just that lol.....

Give me a second.

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Posted

lol. Sticker has no importance at all mate ;)

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Posted

Yup, Darwin award nomination here.

Sorry about wasting your time, guys.

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Posted

No problems mate :)

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Posted

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...

 

 

Yup, Darwin award nomination here.

Sorry about wasting your time, guys.

LOL glad it's sorted, award the answer to the guy above pls on page 1 :p

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Posted

LOL glad it's sorted, award the answer to the guy above pls on page 1 :p

?

I already did

?

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Posted

Well... as they say - happens to the best of us? :laugh:

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Posted

LMAO and the nominee for the best thread of the year goes to... :p

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Posted

On the upside, you'll never overlook something like this again. :p

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Posted

Hahaha, just saw this, made me laugh :)

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