First generation samples are really bad overclockers, lucky, retail samples will be second wave in most cases. I will soon have both revision at my side, comparing what exactly NVIDIA changed. I tell you, the difference is huge, at least 50MHz!
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9600GT in SLI pwns a single G92 8800gts????
http://en.expreview.com/?p=273&page=15
Sure that two 96GT will be faster than one 8800GTS G92, but two 96GT will consume more power, they'll be louder, will heat up pretty hard with singleslot coolers in case and OC potential will be less. Also 50$ more. Go figure. Not to mention you need nVidia chipset board, that is expensive and have compatibility flaws with lots of memory.