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I cant OC Intel Skylake G3900

fauzool

Junior Member
Sep 25, 2017
3
0
1
I trying to OC Intel Skylake G3900 CPU I cant change blck by even 1 and it wont post.
I have asus prime Z270- P. Can someone help me with this? I want to be able to OC
 

VirtualLarry

Lifer
Aug 25, 2001
45,500
4,037
126
Does that board offer Skylake BLCK OC? I think most mobo companies removed that feature before the Z270 came out. (Intel pressured them to remove it, at least from new products.)

I do know that the current board I'm on right now, the ASRock Z170 Pro4S WILL do BLCK OC for locked Skylake CPUs. At least, I tested it with BIOS 7.00. I'd try it again, but I have a Kaby Lake G4560 in here, which are not overclockable.
 

fauzool

Junior Member
Sep 25, 2017
3
0
1
I am able to change settings in the bios, but what ever I try does not work. Based off this id assume I can otherwise it wouldnt let me change settings.
 

Burpo

Diamond Member
Sep 10, 2013
4,067
263
126
Use their software.. ASUS AI Suite 3 for overclocking CPU & memory.
 

VirtualLarry

Lifer
Aug 25, 2001
45,500
4,037
126
I am able to change settings in the bios, but what ever I try does not work. Based off this id assume I can otherwise it wouldnt let me change settings.
No, just because you can adjust BLCK, DOES NOT mean that your board has the ability to BLCK OC a locked Skylake CPU. In fact, it's a specific feature, that loads a debug microcode into the CPU to shut down the PCU, and allow the OC.

BLCK adjustment is provided nominally, to tweak an OC of a "K" SKU CPU, that is already unlocked. That's why you can adjust it.

Edit: Are you sure you have a G3900, and not a G3930?

Edit: It's also possible, that Intel locked out the BLCK OC for locked CPUs, in later revision CPUs, by updating the microcode on new production batches. You may need to get a hold of an "old" G3900 to successfully OC, if your board does have this capability.
 
Last edited:

fauzool

Junior Member
Sep 25, 2017
3
0
1
No, just because you can adjust BLCK, DOES NOT mean that your board has the ability to BLCK OC a locked Skylake CPU. In fact, it's a specific feature, that loads a debug microcode into the CPU to shut down the PCU, and allow the OC.

BLCK adjustment is provided nominally, to tweak an OC of a "K" SKU CPU, that is already unlocked. That's why you can adjust it.

Edit: Are you sure you have a G3900, and not a G3930?

Edit: It's also possible, that Intel locked out the BLCK OC for locked CPUs, in later revision CPUs, by updating the microcode on new production batches. You may need to get a hold of an "old" G3900 to successfully OC, if your board does have this capability.
Thank you for you reply. It is the G3900, but my board is Asus prime z270-p based off that I found that the z170 had the ability to overclock non k in older bios but not the 270. Is there possibly a modded bios of some sort I could use to get this to work?
 

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