GT 640 vs GTS 450 benchmarks
Sorry, had to finish jacking off. As you can see the GT 640 runs cooler and consumes less power but is slower in every performance benchmark. But the 640 is new technology, so that means it also has the awesome power to run DX11 games extremely slowly as well.
You have to go into the shortcut properties and run it in Windows XP compatibility mode. As long as Vista is telling HD Tach that it is XP, HD Tach will run just fine. :D
I use netgear 802.11n wireless bridges and typically I ping 4-7ms higher than my brother who is wired when we play on the same servers. So it's not as bad as some people may have you believe.
I've never, under any hardware, 802.11b/g/n, pinged 50 ms higher over the past 5 years... FWIW