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RAM for DP43BF mainboard

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   Hi all, new to this forum...

I have an Intel DP43BF mainboard running a Q9550 CPU.

I bought it second hand with 2 x 2 GB RAM installed running in Dual-channel.
The RAM says "TW3X4G1333C9A" (Corsair)

A few days ago I wanted to add another 4 GB and bought 2 x 2 GB via ebay.
These say "CMX2GX3M1A1333C9" (also Corsair).

Both are not recognized.
So unless I got sold 2 broken ones (which I don't like to assume), is there anything different with these which would prevent them to work ? (to me both seem DDR3 1333 MHz, so I'm stumped, but I don't have very much knowledge about this)

 

Could it be a problem with high vs. low density ?

But I see nothing about it on the Corsair site for the respective memories.

 

XMS3 — 4GB Dual Channel DDR3 Memory Kit (TW3X4G1333C9

 

XMS3 — 2GB (1x2GB) DDR3 1333MHz C9 Memory Kit (CMX2GX3M1A1333C9)

 

What do  I have to check for when bying again to make sure the memory is working with my board ?

Thanks.


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