Locked PP0 current limit in throttlestop?

[owen10578]

I have an HP Prodesk 600 G1 DM which I put an overpowered 65W i5 4690S when the standard CPUs are the 35W T-series CPUs. For the most part it works fine, I undervolted it to -70mv on the core and cache and that lets it hit 3.4-3.5GHz on all cores which is right in line with the max boost speed. But it does hit EDP Current limits and drop a little bit sometimes, is there a way to unlock the locked PP0 current limit? Also sometimes it hits VR Thermal, which I am not sure if its the motherboard VRM or the FIVR temperatures, can anyone elaborate on this? Would like to modify it to alleviate this.

 

[timmdur]

I'm having the exact same problem. I put an i5-4690k into a Lenovo m93p tiny, and am running into a hard current limit. Hopefully someone knows a way to unlock pp0 current limit!

 

[unclewebb]

If the BIOS has set the lock bit on the Turbo Power Limits or on the PP0 Current Limit, there is no easy way to unlock this register after you boot up into Windows. You would need a modified BIOS or you would have to try and find these locks in the UEFI variables. That is beyond me.

VR THERMAL lighting up in red means your motherboard voltage regulators are too hot. When you swap to a more powerful CPU, these are some of the limitations that can hold you back from achieving maximum performance.

 

[owen10578]

If the BIOS has set the lock bit on the Turbo Power Limits or on the PP0 Current Limit, there is no easy way to unlock this register after you boot up into Windows. You would need a modified BIOS or you would have to try and find these locks in the UEFI variables. That is beyond me.

VR THERMAL lighting up in red means your motherboard voltage regulators are too hot. When you swap to a more powerful CPU, these are some of the limitations that can hold you back from achieving maximum performance.

Oh bummer, thanks for the reply! I guess if the motherboard VRMs are the ones overheating there's no point in increasing the current limit anyways. I'll see about cooling the VRM more but the thing still performs well, all its running is my minecraft server so it does not hit the limits that often except for when there's lots of players or rendering the dynamic map.

 

[Caring1]

Those units are rated at 65W system power, so the power supply will also be struggling.

 

[timmdur]

If the BIOS has set the lock bit on the Turbo Power Limits or on the PP0 Current Limit, there is no easy way to unlock this register after you boot up into Windows. You would need a modified BIOS or you would have to try and find these locks in the UEFI variables. That is beyond me.

VR THERMAL lighting up in red means your motherboard voltage regulators are too hot. When you swap to a more powerful CPU, these are some of the limitations that can hold you back from achieving maximum performance.

My tiny is running off a Dell 240w adapter, and has a coolermaster mars poking through the lid. Needless to say, power supply and thermals are NOT the issue. I undervolted to I think around -120mv, but I don't remember the exact number off the dome. This allows me to sometimes hit the 3.8ghz turbo clock, but I still don't see the performance I'd like to. I've averaged in the low 500s on cinebench R15 (500-515ish), and if I could give the cpu a bit more power I think I could raise the scores a decent bit. So how would I go about getting a modified BIOS? Information on the topic is VERY scarce it seems. The tiny is just a dumb project pc, so I'm down to try anything reasonable! Thanks!

 

[unclewebb]

@timmdur - With a 4th Gen CPU, you can try using the ThrottleStop PowerCut feature.

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I am not sure if this works on desktop CPUs but I think it does. Even if this trick works, I do not think you will see a huge improvement in performance. Your overheating voltage regulators will continue to limit maximum performance.

 

[owen10578]

@timmdur - With a 4th Gen CPU, you can try using the ThrottleStop PowerCut feature.

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I am not sure if this works on desktop CPUs but I think it does. Even if this trick works, I do not think you will see a huge improvement in performance. Your overheating voltage regulators will continue to limit maximum performance.

I tried this it does drop the power use reported but it does not drop the current reported since it still hits EDP Current limits...and then VR Thermal llol

 

[timmdur]

@timmdur - With a 4th Gen CPU, you can try using the ThrottleStop PowerCut feature.

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Thank you for visiting the TechnologyGuide network. Unfortunately, these forums are no longer active. We extend a heartfelt thank you to the entire community for their steadfast support—it is really you, our readers, that drove

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I am not sure if this works on desktop CPUs but I think it does. Even if this trick works, I do not think you will see a huge improvement in performance. Your overheating voltage regulators will continue to limit maximum performance.

I'll have to give that a try. I'm hitting a current limit though, and not a power limit, so I have a feeling it won't do anything. I haven't hit a voltage reg temp limit yet though, so if the power cut trick works it'll probably net me a few points!