For what its worth, those of you on Vista or Windows 7 can add all kinds of nifty monitoring gadgets to your desktop. If you have multiple monitors this works great.
I have one for GPU, System (cores/ram), Network, Hard Drive, weather and time. There are a pair of support programs that augment temp readouts and virtual memory by adding sensor kit software to the mix. So all in all I can see everything happening with out about 1 second lag from the sensors. Well all but Shader core and Video Ram... but that's another story.
What I have observed with my i3-560 and ATI 4650, is that my Hard drive is generating allot of lag as I walk in town. In-fact in town the demand on the GPU drops to about 35%. The lobby server locked me out and I cannot login, I see 21% on a black screen. GPU @ 109 and fan 12%.
Now aside from the issue a hard drive can cause when it has to keep pulling data to display the screen, so to can a network cause lag. Infact in many MMORPG the network cuases more lag than the hardware especialy when your in a buisy location.
You can always turn down or off the graphics. But the network and HDD accesses are pretty much fixed for you.
I agree a high end system should be able to brave the waters. Unfortunately its not as simple as get the best and win the battle. I have been through this with a Microsoft flight sim nut who refused to listen when our shop told him that his SLI was not able to handle his Flight Sim on High. We would fix the comp and he would call and complain that it didn't work and he was angry. We told him not to adjust the settings, which he always did because he believed the combined power should be more than enough to play the game on High. To bad, Microsoft Flight Sim... NOT COMPATIBLE with SLI.
The lesson I want you to take is that just because you have the best there is doesn't make you a GOD. If it doesn't work, realize that there's a reason for this. It might be the Hard drive, it might be your network, it might even be the software is not yet fully compatible with your hardware. Take a breath. Quit the game. Reduce your settings. Enjoy the game like he rest of us, just for a little while. I am sure a patch will come soon enough and you can test out your power then.