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HELP Please: 8 Pack

shadow007

shadow007

shadow007

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Joined
27 Sep 2010
Posts
79
Hi, I bought a i9 7900x from overclockers.co.uk it was the pre-binned (delidded) 4.8Ghz. However I can not reach this speed at all even at 4.0GHz with voltage of 1.35 it's not stable can't even get to the windows login screen. The box the cpu came in says 1.26 to 1.28 volts needed for 4.8GHz overclock. Please can you tell me the settings to get 4.8GHz at the moment am leaving the memory on auto. The motherboard is the Asus Rampage VI Apex and AIO cooler is the NZXT Kraken X62.

Thanks
 
Really appreciate all the replies thanks, there however is definitely something wrong seems like when you want to overclock it will crash. I tried 3.5GHz at 1.20v I mean surely that's more then enough and 1.20v am sure a 280mm AIO cooler can handle that but same results it's only when everything is on "Auto" it's fine (obviously :rolleyes: )
Bios is the latest and everything is default.
 
8 Pack said:
That cpu was retested on apex for 30 mins+ none avx prime after delid so for sure it was fine when it left here. Pre delid we do real bench and non avx too.

No we don't just ship out non tested products ever. This was well tested on the apex.

I am not ruling out damaged in shipping because we had some delid 7700K that had that issue.

So your cooling is simply not enough. Absolute minimum is 360 rad just for capacity. 240-280 is over run with heat.

Firstly totally stock. Test your ram with hci first and xmp.
Click to expand...

Hi 8 Pack, really appreciate your help thanks. I fully understand a 360 rad is minimum but when you under clock the cpu like i did 3.3GHz at 1.14v surely a 280 rad can handle that? It's not even getting to the Windows login screen. The memory is left on Auto running at 2133MHz according to bios. I have set the memory to manual as well 2133MHz at 1.35 with very lose timings of 19-19-19-35 just to elminate the memory is not the problem. However am gonna be really honest with you when i set the memory to XMP and cpu is left on stock auto it crashes just a blank screen but when everything is on stock Auto it runs fine.
Memory is: G.Skill Trident Z RGB 32GB 4133MHz CL19
Motherboard: Asus rampage vi apex
 
Asus just released a new bios today for the Apex 0802 funny the previous one 0702 is not there anymore 0601 is there so is 0227 Maybe bad bios ?

ROG RAMPAGE VI APEX BIOS 0802
1.Fixed SanDisk M.2 device issue.
2.Fixed PLEXTOR device issue.
3.Update Intel X-series CPU (6-core and above) microcode.
4.Improved DRAM / system compatibility.
5.Improved secure erase function.
6.Improved Q-Fan function.
7.Improved system performance.
8.Improve PCH PCIe SSD Performance.
 
8 Pack said:
This looks like a memory issue at face value. X299 skylake X very few can run 4133Mhz in a stable manner. Check 4000 c19 1.45 on mems. One stick at a time installed so 8GB.
Click to expand...

I will definitely do this really appreciate your help. Also on a side note when overclocking does the "cpu current capability" need to be changed as well currently on 100% can go all the way to 240%
 
Update: After a bios update to 0802 the XMP is now working just getting above 4133Mhz also when setting to XMP cpu overclocks to 4.6 ? anyways done a memory stress test for about 40 minutes no issues. However the cpu problem is still there when I change from XMP to Manual again even a overclock of 3.5GHz with a voltage of 1.10 will not work? The memory XMP is working so surely can't be the memory?
 
Ok this is getting weird and weird ok I have been doing the following every single time

Ai Overclock Tuner - Manual
CPU Strap - 100
BCLK Frequency - 100.000
CPU Core Ratio - Sync All Cores
CPU Ratio - To whatever overclock I like
CPU Core Voltage - Manual Mode
CPU Input Voltage - Depends on the overclock

So keeping the above in mind I did a 2.0GHz at 1.30v no luck blank screen I just got so annoyed took the CPU Input voltage to 1.90v yes 1.90 & GUESS WHAT? made it without crashing
Know this is the part it gets wired in CPU-Z it's showing the speed as 2000MHz which is fine what I set it at but the voltage is at 0.940v ??? it's showing the same in CPUID HWMonitor under VCORE a voltage of 0.933 Then I did a Stress test with Aida64 did not even go past 40c on full load because the voltage is actually 0.940 but in BIOS REMEMBER I set it to 1.90v ??? No wonder I was getting the blank screen because
IN BIOS CPU Input Voltage of 1.90 = to 0.940 in windows ? 8 PACK please help :(
 
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Just increased my CPU Input voltage in BIOS to 2.00v and in CPUID HWMonitor "VCORE" and in CPU-Z "Core Voltage" both showing exactly the same 0.992 V
I can't go above 2.70v as thats the max in bios but actually only will be something around 1.11v
Done a Aida64 test max temp 43c to be honest this doesn't matter I should not even get into windows if the voltage was actually 2.00v forgot about windows probably would't even start.
 
First of all thanks to everyone that replied and a big big thank you to 8 Pack for trying to help me out.

Ok i put my hands up i messed up big time (know i look stupid which i deserve to :) ) all this time i was adjusting the CPU Input voltage it's actually the "CPU core voltage override" that was meant to be adjusted for the cpu cores this was left on Auto all the time. The clue was there "cpu core voltage" but just looked at the override word and left it on auto.
This is what happens when you overclock after a few years. :rolleyes:
 
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