I remember seeing that flashing thing on the AGP 6800 card and the performance increase was very negligible.
Worth messing with the "unlock pipe" idea? I don't think so, should've spent and extra $80 and gotten a 7800 GT w/20 pipes. I thought about getting a 7800 GT but I seriously doubt that I would've seen that much improvement.
The 6800 GS as it is, packs enough power to satisfy most of the people here, can't really say that SLI is very helpful on a LAN Party or even on the internet. My nephew plays on-line on a 6600 GT at stock speeds fine, gets like 80fps in UT2K4.