@mtl777: I'm quite sure that you're gonna run into these latency issues when using any kind of Cool'n Quiet. E.g. if all cores enter a power-saving state, the single core voltage is reduced in small steps before reducing the core clock frequencies. So I think it's very likely that the cores are blocked for a very short time period during this transition, hence increasing the latency. PhenomMsrTweaker's custom C&Q keeps all cores synchronized and allows you to adjust the responsiveness to load changes. I've just run this latency checker for some minutes while surfing and starting 2 very short Prime95 runs (one with 2 threads, then one with 4). My absolute maximum latency has been 162 microseconds, so it should actually be fine (surprisingly). I'm using a slightly overclocked X4 9950 and PhenomMsrTweaker's custom C&Q with default settings on Win7 RC x64. But please perform your own tests, it's not gonna destroy your CPU. Oh and btw, you can always disable C&Q temporarily by switching the active power scheme to 'High performance'.

@Particle: I've just browsed very quickly through your thread. I'm sorry but I can't help you, since the tweaker only adjusts the CPU cores' MSRs - and whenever a VID change is requested, it is checked for validity (i.e. in [MinVid, MaxVid]). Since these are read-only MSR fields, there is no way to fool the CPU by using higher VIDs (unless the fields aren't really read-only as the docs suggest...). I guess you need to either wait for BIOS support (although you'll probably wait forever), access the voltage regulator manually if somehow possible (e.g. by accessing the PCI configuration space) or get soldering.