no, 2.5 is what they are warrantied for. well those chips anyways. I haven't read the review yet....but, I believe they are using the micron chips. Those will do 2.4 all day. any higher and you'll cut down on the life expectancy of them big time. Not to mention the need for active cooling.
My Ballistix tracers were running 1014 @ 2.4 for a while and man those suckers got hot during prime.
And yes, the D9GMH as mentioned in the review are Micron chips...I'd be willing to bet that 98% of manufacturers that use those for their memory can be overclocked to pc-8000 speeds @ 5-5-5-12 @ 2.2v
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