I don't know about an nF2 chipset but every nvidia GPU and most NB's I've seen are 'embedded/encapsulated' in plastic or under a copper slug (Ti's). they have all been far from flat, I lapp my GPU's and NB cores always if I'm going to overclock. I've had big improvements in mem timings after lapping a ALiMajik NB, went from fast~Ultra on the same memory, could'nt test FSB increase cause it was capped at 147...
You seriously don't need an optical flat to see the amount of iregularity, just lapp your HS then put some paste on it and see what markings are left on the NB & HS. I'd bet a pound to a penny it'll be 'edges only...
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