Pretty sure they are the same, yeah. Why would they develop 2 physically different chips? They just hardware block shader units and stuff.
According to ASUS they OC the same.
I don't know if they will unlock. We haven't had video cards with disabled units for a while. Maybe they improved their locking techniques.
And regarding the VRAM... I am surprised manufacturers use new GDDR5 for 5850 instead of using those from 4870 and 4890 since it is fitting clock speed wise.
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