Can you give values for higher hashrates?
I'm currently running mine steady @ 2.6 (4c81) with HW=0, just wanting to see if I could push it just a bit more.

(2.8 (4d81) is too much, the miner doesn't start)
Wow!!! 4c81? Totally curious!!!
Anything soldered?
Where did you found those values?
What sort of black magic did you cast on these things to get it up that high? I can barely run one of them at x0981 (2 GHS) with 0 HW errors and the other at x0881 because if I bump the lower one up, I get mad HW errors, and if I bump the other one up to x0A81, I get about a shit ton of hardware errors...
I am using 0A01 and this is the result I get:
cgminer version 3.9.0 - Started: [2014-01-23 13:06:54]
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(5s):10.47G (avg):9.593Gh/s | A:31970 R:10 HW:211 WU:133.1/m
ST: 2 SS: 0 NB: 28 LW: 44331 GF: 0 RF: 0
Connected to mmpool.bitparking.com diff 10 with stratum as user
Block: 1ef58c7f... Diff:1.79G Started: [16:36:40] Best share: 12.1K
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[P]ool management [S]ettings [D]isplay options [Q]uit
AMU 0: | 447.6M/447.4Mh/s | A: 1430 R: 0 HW:52 WU: 6.3/m
AMU 1: | 456.4M/459.0Mh/s | A: 1470 R: 0 HW:66 WU: 5.9/m
BAJ 0: max 33C 0.99V | 4.628G/4.685Gh/s | A:16160 R:10 HW: 1 WU:65.4/m
ANT 0: | 3.054G/2.012Gh/s | A: 6600 R: 0 HW:40 WU:27.9/m
ANT 1: | 2.778G/1.993Gh/s | A: 6310 R: 0 HW:52 WU:27.6/m
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I'd guess this is somehow, stable, althought it isn't the anounced value!!
And I get somewhat the same value with 0981.