im not sure, its been faultless up to that point, and the new one is totally reliable too.
the first one i had would oc to 109 FSB, but the new one only goes to 102 FSB

and when i go past this the boot up mhz is 297, which is totally bizarre
also the fan plugs have been moved, the old board had the CPU fan plug to the top right of the CPU, but thats moved to the bottom left.
when did u get yours? mine was in with the computer when i brought it about 5 or 6 months ago
"should i be worried?" depends what sort of warrenty you have got, and wether or not its a/the newer revision.