Most likely is buddy. Not now but you are putting strain on the bus paths and could eventually crack sometin.
You could string the HSF to the top of your case to relive some stress of the mobo. I normally do this with the zalman flower HSFs or one that I made up that was too damn heavy. Today HSF are getting to damn big which Im surprised that they havent includes such additional supports in their kits.
<i><font color=red>Only an overclocker can make a computer into a convectional oven.</i></font color=red>
hehe, you know how those .06mm steel cases flex if you throw a pack of cigarettes on them? You can get similar cases in the same thickness made of aluminum now...imagine the support your motherboard gets!
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<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>