@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'.
Originally Posted by kink
@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.
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