You probably have room temperature-wise, but not under 1.3v. Assuming that 4.4GHz @ 1.24v is the minimum for stability then 4.5GHz will probably be 1.3v.
With mine (i5 not i7) it's roughly 0.07v for every 100MHz between 4.0GHz and 4.8GHz.
But, keep in mind that LgFFT is usually 15 to 20C cooler than SmFFT, and about 5 to 10C cooler than LinPack... so your actual maximum temp might be 95 to 105C, however most real-world applications won't get it that hot.
Right now with mine, at 4.5GHz @ 1.27 to 1.31v (depending on ambient to keep it stable) I'll hit peak/throttle temperature using LinPack, however stuff like gaming, or file compression, virus scans, etc only peak at about 75C.
Edit: basically what I'm saying is, go for 4.5GHz, it'll do it, and "safely"... you could probably do 4.6GHz safely as well, or for that matter 4.8GHz, but you likely won't be able to keep it there, as your board and CPU "break in", and your cooler/case gets a bit dirtier, etc... it'll get a bit more hot, require a bit more voltage, etc and you'll have to drop it back down again in a few months.
Last edited by Vectronic; 05-19-2013 at 04:01 PM.