What's the dual bios though and how do I invoke it - is that the difference?
The card should have a tiny switch on it which gives you two options --- default or overclocked bios.
Not sure on the specifics, but it goes like this:
Core Clock: 950 /
1000MHz if set to overclocked biosEffective Memory Clock: 1425MHz(5.7Gbps) /
1450MHz(5.8Gbps) if set to overclocked biosThe switch is tiny, but once I found it, I get steady 590 Mhash/s on the overclocked bios bank using GUIMiner (I believe overclocked is bank #2)