Is 240-Pin DDR2 FB-DIMM interchangeable with 240-Pin DDR2 SDRAM?

box o rocks · Jun 24, 2014

As mentioned in the title, I am wondering if either one can be used in a DDR2 memory slot.

dwatterworth · Jun 24, 2014

You cannot interchange the two, they are physically different.

http://en.wikipedia.org/wiki/Fully_Buffered_DIMM#mediaviewer/File:FB-DIMM_DDR2_vs._DDR2_photo_with_pin_count.jpg

Note the pin gap positioning in the diagram on the right.

box o rocks · Jun 24, 2014

dwatterworth :

Wow, that's a miniscule difference. Thanks for the detailed explanation. Lol... I wonder how many folks have scratched their heads wondering why they can't seat their RAM? So the DDR2 SDRAM is the common stuff for most DDR2 motherboards, then?

Pinhedd · Jun 24, 2014

box o rocks :

Probably close to none. FB-DIMMs are only used by a small number of now EOL server chipsets. FBDIMMs aren't something that are found in your friendly neighbourhood computer store.

dwatterworth · Jun 24, 2014

box o rocks :

The fbdimms were common for ddr2 in workstation builds. I had a dual Xeon board for my architecture school self build. Dell had a few over the years along with evga making the sr9x or classified boards. Definitely not mainstream though.

box o rocks · Jun 25, 2014

Pinhedd :

box o rocks :

Probably close to none. FB-DIMMs are only used by a small number of now EOL server chipsets. FBDIMMs aren't something that are found in your friendly neighbourhood computer store.

I meant folks like me that saw them on Newegg and didn't realize there was a difference. They are sold right next to the SDRAMs with no explanation of the difference. DDR2 is DDR2 to some of us newbies.

Pinhedd · Jun 25, 2014

box o rocks :

Pinhedd :

I meant folks like me that saw them on Newegg and didn't realize there was a difference. They are sold right next to the SDRAMs with no explanation of the difference. DDR2 is DDR2 to some of us newbies.

They are DDR2 SDRAM so placing them there would be appropriate. They are not DDR2 DIMMs though, and have a different electrical interface.

I see your point though, I didn't think about online retailers.

dwatterworth · Jun 25, 2014

You would think they would move the FB-Dimms or ECC memory fully into the server parts section. I guess it depends how you search for the parts. Not like you see a e3 xeon in the desktop parts section, even though they would work in the socket.

Pinhedd · Jun 25, 2014

dwatterworth :

I see your point. You may wish to send them some feedback about that.

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Is 240-Pin DDR2 FB-DIMM interchangeable with 240-Pin DDR2 SDRAM?

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