Ordered Memory - Rcvd Wrong Part - Mislabelled. Can Anyone Identify this Memory?

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slarabee

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May 9, 2014
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So I ordered DDR2 Memory PC5300 to replace memory in a Dell Precision 490 Workstation and what I received does not physically fit in the memory slots.

Here is a picture of the old memory and the new (New/Wrong Part on Top):

IMG_1450.jpg


Here they are stacked so you can see the problem New on top again:

IMG_1452.jpg


Any help in understanding what has gone wrong here would be most appreciated. Need to get the proper memory ordered asap.

Thanks,

Sean

 
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slarabee

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May 9, 2014
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Knott,

Thank you we are doing that but what the heck is that part? I do not want to order the wrong part twice. Was this my error or theirs? Is that top part pc5300 ddr2 memory?
 
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WyomingKnott

WyomingKnott

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Aug 29, 2006
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The existing memory looks like server ECC buffered DDR2 memory: http://www.memory4less.com/m4l_itemdetail.aspx?itemid=554135398 . I lost track counting the pins and I'm not going to start again, but if it's 240 pins then that's definitely the DDRs memory. DDR has 184 pins. So you could count the pins. I saw 55 on one side of the notch, times two is 110, so it's more likely 240 pins.

I got this by searching for UW728-IFA-INTC0S

The new part has a model number HYS72T256220HP-3S-B. Searching on that tells me it's 240-pin DDR2 also.

So they both seem to be 240-pin modules, and that means DDR2. I'm absolutely serious when I suggest that you count the pins on both. If they are both 240 pin and they are keyed differently, then one if them is a proprietary format.

If I had that problem I would contact Kingston tech support with the model number and a picture and ask them what's compatible. Well, actually, I would build a more up-to-date machine - someone sold four modules of the memory you have on Ebay for ten bucks; it's awfully old.
 
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slarabee

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May 9, 2014
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Thank you Panopticon!

That seems to be the issue. The fully buffered (FB) DDR2 chips are physically different. 20 years in this business and I have never seen that. Live and learn something new every day.

Thanks again.

Sean
 
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Pinhedd

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Aug 7, 2007
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Yup, that's a DDR2 FBDIMM. It was only used in a small handful of Xeon platforms. There's no DDR3 FBDIMM specification as it's not needed.

The heatsink on the FBDIMM covers the AMB, or Advanced Memory Buffer. It's a pretty neat way of doing memory operations.
 
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