is the 7970 PCI 3.0?
Yep, but PCI-E 3 is backwards compatible with PCI-E 2 so it will still work just not at PCI-E 3 bandwidth which I don't think matters performance wise, but no one knows for sure yet.
The card most likely features 1.5 GB GDDR5
i hope that isnt true, i thought the reason they put 2GB on the 6900 series and released a 2GB version of the 5870 was because 1GB couldn't handle 3 screens and the 1.5GB 580s couldn't really handle it either so manufactures started making 3GB editions
heck in some games when maxed out the 1.5GB 580s are vram limited even at 1080p
I also thought that was to little memory, 12 ram chips should give more than 1.5 gb, 3gb sounds right to me.
yeah that sounds right to me as well i think it went
4800 512MB (not sure as this was before my time, feel free to correct me if i am wrong )
5800 1GB
6900 2GB
7900 3GB sounds about right, 1.5GB makes it look like a downgrade even if it is clocked faster
Some more pics. A naked PCB...
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http://www.techpowerup.com/156468/AMD-Tahiti-(Radeon-HD-7900)-Graphics-Card-Seen-in-the-Nude.html