i have a little problem with my 4820k

[Sonic_AFB]

Hello! first i'm spanish and maybe something it will bad written, sorry for that!

About my 4820k i bought him in january of this year, in a few days got to have a stable overclock at 4.4 Ghz with 1.296v, but since 2 months recently got BSOD with code 9C.

I tried all but nothing works, i tried upping the vcore from 1.296v to 1.320v and nothing, lowering the clock of the ram to his stock speed and latency and nothing, i tried upping IMC voltage to 1.150v and nothing, i tried every single stick of ram waiting some errors and nothing, BSOD 9c.. at 4.2 Ghz and 4.3 Ghz it works perfect, but at 4.4 Ghz not.. always 9C..

i'm desperate.. some ideas?

My PC Is:
i7 4820k
Gigabyte X79-UD3 with F18 Bios
8 Gb Ram G.Skill 1600 Mhz
HD 7970
Aerocool HorsePower 650w 80+ PSU

CPU and GPU are watercooled, I've also tried another power supply but still fails

Regards and have a nice day

 

[Sonic_AFB]

9C can be several things.

You tried a different PSU or running GPU at stock to rule these components out??

Yes, i tried with a 850w cooler master silent pro hybrid psu, and with the gpu at stock clocks and nothing, more BSOD 9c, this problems with 9C started when i watercooled the gpu, before of watercooled the gpu it was in 3º pci-ex (16x), after is in the 2º pci-ex (8x) this can influence?

Having that setup basically I can tell you its a bit of fun and games :S

Prior to F17 or so and its still not 100% solved in F18 onwards there is a bug with certain RAM configurations where VTT and IMC will momentarily drop to BIOS defaults at random regardless of what is set which usually results in a BSOD - however I've not been able to reproduce it with RAM setup for 2133MHz.

Mine needs all of 1.32v 110% stable to get 4.4GHz - if its fluctuating at all below 1.32 = BSOD usually 101 or sometimes 9c. The vcore goes up in steps so you might need to nudge it up slightly until its at 1.32 solid instead of bouncing around between 1.32 and 1.308 or whatever the step below it is.

EDIT: What is your VTT set to in the BIOS? and are you using offset voltage or manually entering a target voltage?

Hi, the VTT voltage in bios is the stock (1.050v) i tried with 1.080v, and RAM at 2133,1866,1600(stock),800 and 9C everywhere

My ram voltage is 1.595v
IMC 1.13v
VTT 1.050v

I'm using offset voltage VID:1250v+0.045v with LLC in turbo, 1.296v gaming, rendering or high stress test and 1.308v with very high stress test, for example prime95 using AVX

Updating Bios to F20 will not help true?

Thanks at all!!

 

[Sonic_AFB]

Might be worth giving F20 a try but I'd not seen it really have any effect on the stability of the board.

Without knowing first hand the overclocking capabilities of your CPU its hard to give a guide to VTT but I'd have said around 1.1 to 1.15 may be needed - usually you don't need to go above 1.1 and should try to stay below 1.2.

My CPU isn't a good overclocker:

4.2Ghz with 1.18v
4.3Ghz with 1.23v
4.4Ghz with 1.296v
4.5Ghz unstable with 1.38v

I will try setting the VTT at 1.1v, what seems to me most strange of all this, is that from January to June has worked perfectly

Memory at 1600 wioth 1600 IMC should be fine. Not touched this board in a long time though so cant remember how I set it up. One board did have Vdroop on VTT quite bad if using a DMM to measure.

You can try upto 1.2v safely without issues on those chips anyway.

Up to 4.2 Ghz works perfectly (at 4.2Ghz i only have a one BSOD 9C months ago) going beyond this point the problems being contiuous with ram at 1600 as 2133.. i will try with ~1.2v

^^ The VTT droop is actually (I think based on a guess at its behaviour) a bug in the BIOS/hardware as it will drop to exactly the BIOS default setting - which if your system isn't stable with that voltage = BSOD. Its mostly fixed AFAIK in the more recent updates - atleast F18 onwards.

End of the day the UD3 is a budget board (and unlike UD3 boards from other generations very much a budget board) and not really ideal for anything other than fairly pedestrian overclocks - took a lot more work to get my 4820K to 4.4GHz than I've had experience of overclocking on other X79 systems.

Maybe in a closer future, i should change my board for a better one?

Thanks and have a nice day

 

[Sonic_AFB]

today, the day is very cold so i do new test and nothing result, i try with a VTT from 1.120 to 1.150 and when more is the voltage, more quickly gives me the 9C Code, i try with the IMC voltage too, from 1.080v to 1.150v and nothing, everytime BSOD 9C.. only need to test change the GPU to another PCI-EX, the problems start when i was changed from 3rd PCI-EX (16x) to 2nd PCI-EX(8x) i will try when i buy new tube for the RL.. more ideas? i dont know what else to try


Regards