Can someone explain speedstep and c-states and how to use them - properly

BS Dave · 14 Jan 2015 at 22:06

I know they downclock/reduce voltage when your cpu is under light load/idle - i get that but i want to tune my 3930k so that

At idle it clocks down and lowers voltage

but with any load at all skips to full turbo/voltage

I've been playing BF4 and noticed it keeps clocking down causing cpu spikes which is not what i bought it for....

Is there any combination of c-state/c1e/speedstep i can use to get the above effect???

Many thanks

Dave

BS Dave · 15 Jan 2015 at 08:08

I think the problem with bf4 is it's spreading the load across cores so well they down clock. I've been using dynamic voltage but I might try constant and see if I can't just eek the volts down a bit. On dynamic the chip wants 1.44v for 4.6 which is a little more than I'd like even if it is under water.

BS Dave · 15 Jan 2015 at 20:13

ok c-states 3-7 off, high performance setting seems to be working in windows. if that works i'll try re-enabling c-states

BS Dave · 15 Jan 2015 at 22:51

Thanks Murah, I'm currently running offset mode with c1e enabled c states 3-7 disabled but package c states support enabled and I down clock but the voltage doesn't go down. I will try enabling c-states 3-7 again with high performance profile as I said. I'm on windows 8.1 so I'm not sure I need to until park cores - I think it's handled in a different way

BS Dave · 15 Jan 2015 at 23:08

I'm watching the CPU render graph in bf4. Usually it doesn't spike indicating a frame taking ages to render unless you join the game or esc out to options etc but I was getting loads of almost regular CPU spikes

BS Dave · 26 Jan 2015 at 23:57

Well after turning them off then on again, and thinking everything was fine I'm now getting crashes all over the show. I cloned my install onto a Samsung 840pro so it could be dodgy memory and rapid mode, and I've also flashed the bios of my 2nd 290 tri-x... So many things it could be and all I wanna do us play bf4!!