did you notice the power consumption??? it takes an additional 216watts to get that speed..... not worth it IMO. a 260-watt CPU is going to run up the electric bill.
like most things of this nature, too good to be true
maybe a good project if you don't mind the effects of the OC
of course, L1 cache is so unimportant that it has been a vital feature of processors for longer than L2 cache? L1 cache does all the work, L2 helps but it only picks up the slack.
edit: has no-one noticed the existence of the 805 yet?