I mean, Avalon chips ship at 300Mhz, but are known to run at 450 and theoretically even more if it were only a transistor transition time.
I don't list theoretical results.
If Avalon are willing to stake their reputation on a public claim that their product provides 450mh/s with heroic cooling, and a third party verifies that using a few randomly chosen chips, I'll list them at 450mh/s.
I said 450Mhz, not 450MHash/s, but that would would be about 439MHash, maybe.
Here's a quote from Bitsyncom referencing the 450Mhz figure:
was wondering how long it'd take people to notice ( and more importantly
share the constant that we've released on github.)
the number you are all aiming for is 450

of course, that's not really possible on just air cooling.
The 300Mhz the unit shipped with was based on the PSU and cooling, not the chip.