[Guide] How to take full control of the i7-8750H (Advanced version)

[Guide] How to take full control of the i7-8750H (Advanced version)

@unclewebb @Falkentyne @raz8020

Greetings fellow members,

If you are looking for full control in Windows over the C-state and the multiplier in the Turbo boost mode and also to let the Speedshift run correctly, then this guide is for you.

Firstly, you'll need to download ThrottleStop to perform the steps in this guide.

Secondly, you need to unlock your BIOS, if you are coming from other brands, you may need to look for a way to unlock it. These are the items you need to have access to in your BIOS:

Intel (R) Speed Shift Technology
Software Guard Extension (SGX)
CPU Flex Ratio Override
CPU Flex Ratio Settings
CFG Lock in the View/Configure CPU Lock Option page.

For MSI users, it’ll be much easier and safer, there’s a key combination to unlock the BIOS, but for this key combination please look in the forum, I’m not allowed to post it in public to avoid an increase in bricking cases. Still, if you found the key combination, don’t touch anything you don’t know!!

For GS65 owners: If you managed to find the key combination, here is the warning, the only thing full CMOS clear reset is the RAM settings, so if you mess up anything related to the CPU, you cannot revert it, especially undervolting in the BIOS, if you have gone too far, and caused the CPU to crash upon power start, RMA or SPI programming is your only saver. For undervolting, ThrottleStop FTW.

Also, I’m not responsible to any bricking or anything that caused damage to your laptop, use this guide at your own risk!

====Chapter 1: The ability to set the C-state in Windows====

Go to BIOS > Advanced > Power & Performance > CPU – Power Management Control > View/Configure CPU Lock Options

Set CFG Lock to Disabled.

Now, go into ThrottleStop, you’ll find the C state is no longer locked and can be change as desired.

In my case I use C3 for plugged-in Mode and C8 for Battery mode.

====End of Chapter 1====

====Chapter2: Unlock the minimum multiplier down to 8 in the Turbo Ratio Limits====

The lowest multiplier forced in the GS65 is x11, but this mod can get you past that, to go down to as low as x8.

Go to BIOS > Advanced > CPU Information

Set CPU Flex Ratio Override to Enabled.
Set CPU Flex Ratio Settings to 8.

Load Windows and load ThrottleStop

Now, go into ThrottleStop, you’ll find the minimum value you can go down to in the Turbo Ratio Limit in FIVR is no longer locked to 22 and can go down to 8, please set them as you desired.

Just remember to turn on Turbo Boost to control the multipliers.

If you run Firestrike you may find the MHz of your CPU detected by the Futuremark spec tool shows 800MHz. But that is not a problem.

In my case, I set 10, 10, 10, 9, 9, 8 in FIVR for the Battery mode, but to use these multipliers correctly, you’ll need to enable core parking for that, which is disabled by default in Windows 10, we’ll talk about it later in chapter 3.

You can do some silly multipliers, like 41, 41, 25, 20, 10, 8, it is all up to you.

Please note that it won’t go lowered than x8 even if you forced it in the BIOS.

====End of Chapter 2====

====Chapter 3: Enable Core Parking====

Open Regedit and go to:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\0cc5b647-c1df-4637-891a-dec35c318583]

And set Attribute to 2.

Now, close the regedit and go to Power Option > Go to your Power Plan > Advanced Power Option > Processor Power Management

Set “Processor performance core parking min cores” to 0%.

Now you should able to see that the multiplier can to go up to the higher multiplier you set in the FIVR when some of the core usage goes as low as 0.1 in ThrottleStop.

What this does is to allow the CPU to shut off the cores when not needed, and this also triggers the function of Less core active leads to higher MHz.

This is especially useful in the Battery mode, let’s say you want to set x8 when 6 cores are in use and x16 when 3 cores are in use or x40 when 3 cores are in use (Just for the fun), this makes it become possible and highly flexible.

====End of Chapter 3====

====Chapter 4: Make the way the Speed Shift to work as it should be ====

Many of you already know that you can set the EPP value in the ThrottleStop, but not many people know that Windows is also battling with the EPP value you set in ThrottleStop, it is because the Windows also has their own EPP, but it comes in %, however, instead of having them both battle each other, you just need to set both into the same setting, so no matter which side Wins, the CPU is still listening to the same value.

But to do that, you must first get the Windows EPP option to show in the Power Option first, to do that, go to:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\36687f9e-e3a5-4dbf-b1dc-15eb381c6863]

And Set Attribute to 2.

Now, go to Power Option > Go to your Power Plan > Advanced Power Option > Processor Power Management

And you’ll see there’s a new option called “Processor energy performance preference policy”, the setting comes in %.

Now you are wondering what does the % mean, it actually relates to the EPP in ThrottleStop but only comes in %, this is what I’ve posted before in the GS65 owner thread, the ratio table of Windows EPP vs ThrottleStop EPP:

1% = 2
2% = 5
3% = 7
4% = 10
5% = 12
6% = 15
7% = 17
8% = 20
9% = 22
10% = 25
11% = 28
12% = 30
13% = 33
14% = 35
15% = 38
16% = 40
17% = 43
18% = 45
19% = 48
20% = 51
21% = 53
22% = 56
23% = 58
24% = 61
25% = 63
26% = 66
27% = 68
28% = 71
29% = 73
30% = 76
31% = 79
32% = 81
33% = 84
34% = 86
35% = 89
36% = 91
37% = 94
38% = 96
39% = 99
40% = 102
41% = 104
42% = 107
43% = 109
44% = 112
45% = 114
46% = 117
47% = 119
48% = 122
49% = 124
50% = 127
51% = 130
52% = 132
53% = 135
54% = 137
55% = 140
56% = 142
57% = 145
58% = 147
59% = 150
60% = 153
61% = 155
62% = 158
63% = 160
64% = 163
65% = 165
66% = 168
67% = 170
68% = 173
69% = 175
70% = 178
71% = 181
72% = 183
73% = 186
74% = 188
75% = 191
76% = 193
77% = 196
78% = 198
79% = 201
80% = 204
81% = 206
82% = 209
83% = 211
84% = 214
85% = 216
86% = 219
87% = 221
88% = 224
89% = 226
90% = 229
91% = 232
92% = 234
93% = 237
94% = 239
95% = 242
96% = 244
97% = 247
98% = 249
99% = 252
100% = 255

Every time you set a new value in the “Processor energy performance preference policy”, you’ll need to go to ThrottleStop to set the corresponding EPP value again.

Currently, I’m using ThrottleStop EPP 63 (25% for Windows) for plugged-in mode and ThrottleStop EPP 127 (50% for Windows) for Battery mode.

By the way, make sure you have ticked the “Enable Speed Shift when ThrottleStop starts”.

And if you can, you can set Intel (R) Speed Shift Technology in the BIOS to enabled to have the SST enabled on start-up.

====End of Chapter 4====

====Extra bit, Chapter 5: Disable Software Guard Extension (SGX)====

To disable SGX

Go to BIOS > Advanced > CPU Information

Set Software Guard Extension (SGX) to Disabled.

 

Aside from efficiency, does this improve performance?

 

Not for the programs that are using all the threads at once, but for programs that are running in fewer threads, there should be some improvements.

 

Just wondering do you know if any settings in BIOS that can affect package C state besides the ones under cpu configuration?

 

The options I know that mess with the C state in the BIOS are the followings:

1. CPU C state allows or prevents that CPU to go into C states when it is not 100% utilized.
2. Package C states Limit allows you to designate that the deepest C state that the CPU can go to.
3. CFG Lock allows or prevent changing the C state limit in your OS.
4. C6DRAM allows or prevent DRAM contents to be moved to PRM memory when CPU is in C6 state.
5. Native ASPM limits the C state to C3 and will not go deeper when set to Enabled, still, it'll show C8 in ThrottleStop, but you'll notice that except C2 and C3, all other C state are full time 0%, which means in practical the deepest C state is only C3.

 

CPU C state can always go to C7 (max shown in TS). The BIOS setting is enabled by default.
Package C states limit is auto by default. TS shows the limit as C10. Manually change the BIOS setting doesn't help.
CFG Lock disabled let TS to control package C states limit but since it's already at C10 this doesn't help either.
Can't find C6DRAM and Native ASPM in my BIOS. Could you please tell me where do you find it on your laptop?
I think I saw something called ASPM support. Gotta check later.
Also in the SATA menu, it sets my SSD as HDD and apaprently DEVSLP is disabled. Is it ok to enable it?
Thanks.

 

Oh btw is there any tool that can check PCIe ASPM status?

 

The advantage of having the CFG Lock disabled is to give you access through ThrottleStop to switch between different C-state quickly using profile, you can use it in a situation for C1 for plugged-in and C7 for Battery, C1 has the shortest time to resume to C0 where the C7 takes longer, which also means performance is improved by giving up energy efficient.

On the newer MSI machines, C6DRAM is usually placed under CPU information, and Native ASPM is usually placed under RC ACPI.

ASPM support sounds something similar to the Native ASPM.

DEVSLP stands for device sleep mode, it is like the PCI-E's L0s mode, usually you need to appoint when it enters into this mode, the range of action should cover only the route or also the device, in the case of dGPU, sometimes wrong choice could lead to BSOD when you are trying to wake the dGPU. The settings for SSD also have similar things, HIPM only has the route entered low power mode, where the DIPM has the device entered low power mode. I believe DEVSLP is to have the device entered sleep mode, probably something like PCI-E's L1 mode for less power consumption than L0s mode. What does it say in the description?

I haven't come across that.

 

thanks for this! This is golden.

 

"there’s a key combination to unlock the BIOS, but for this key combination please look in the forum"
I looked.
Then I came back here, reread the post and looked again.
I used the search tool, couldn't find it then gave up.
I have repeated this 5x now.........
Can someone pm me the combination or a link to the post?!