should any ddr2 memory module fit any mobo that supports ddr2?

kc56

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Apr 17, 2015
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I recently purchased a 4gb ddr2 667mhz pc2 5300f memory module for my ECS g41t-m mobo only the keyhole in the mod doesn't line up with the keyhole on the mobo. I have ddr2 memory on the board now. Are they not standard, at least in size? I do know that some don't work with certain CPUs but I assumed that was a different issue.
 


It is labeled as DDR2 and I have tried it both ways and also compared it to the one that fits and it is different, but only slightly. I asked the question to determine if the vendor sent me the wrong part or the part is defective.
 
The F stands for Fully Buffered Server Memory. 240 pin FB-DIMM DDR2 are notched differently from conventional 240-pin DDR2. Those types are neither mechanically nor electrically compatible. They were used in Intel Xeon processor 5000 sequence (Dempsey)/Blackford chipset server motherboards around 2007.