You Definetly can run the AMD 840 in the M2n68-LA(Narra3) Motherboard I'm useing it as of this moment. It does come upknown model AMD processor but gives the Correct Speed of the processor. I checkd with AMD before I installed it and they said it should and it did Kudos AMD.
Hi Young, I have the same board M2N68-LA(Narra3) and I am about to buy the Phenom II 840 soon maybe even the 850 when it comes out. I had a feeling it would work after the months of research. Thanks for your help and I owe you one!
Just to make sure heres both links:My computer and motherboardhttp://h10025.www1.hp.com/ewfrf/wc/document?docname=c01357135&tmp_task=prodinfoCategory&cc=us&dlc=en&lc=en&product=3794737#N94
The processor I am buyinghttp://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7225660&CatId=4431
Is this what you got?