Having trouble overclocking, please help! 6800k on a ASRock Extreme4 motherboard

[MVollrath50]

Hello, I am trying to overclock my i7 6800k to what I thought to be an easy 4.0-4.2ghz. My friends and I have tried all sort of combinations but can not get anything to post. Instantly get a blank screen and the only way to get back in to BIOS is to press the Clear CMOS button on the back of the motherboard. Hear are some of the examples we have tried.

Combos:

1. Change Multipliers: CPU-40 & Cache-34, VCore 1.3, CPU Load Level: 3 ( lvl 1 meaning highest or disable, and lvl 5 meaning lowest). Leaving BCLK & DRAM to stock ( 100 & 2133).
2. Activated XMP, Automatically changes BCLK to 120, which also gives me the native dram frequency for my memory @ 3200. CPU x34 & Cache x34, VCore 1.3, & Load Level 3
3. Turned off XMP but changed frequency to 3200. Leave everything else stock (BCLK: 100.00, CPU: x34, Cache: x28, VCore: Auto)   

System

• CPU
  Intel i7 Broadwell-E 6800k
• Motherboard
  Asrock X99 Extreme4 ATX
• RAM
  GSkill Ripjaws4 16GB DDR4 3200
• GPU
  EVGA GTX 1080 SC
• Case
  Rosewill Throne
• Storage
  Seagate 1TB Hybrid & Samsung NVMe M.2 960 Evo 500GB
• PSU
  Corsair AX760 Fully Modular
• Display(s)
  Dell S2716DG 27" GSync 144Hz
• Cooling
  Corsair H105
• Keyboard
  Drevo 72 RGB Wireless
• Mouse
  Corsair Dark
• Sound
  Pioneer 5.1 channel Surround Sound
• Operating System
  Windows 10

[corrado33]

Hm, that's odd. Try this, just load optimized defaults, put your Vcore up to 1.35, then change your multiplier to 35. That should 100% work. Then increase the multiplier until the computer no longer starts and report back. 

[Guest]

have you tried reinstalling your bios? (that fixed it for my old Xeon server)

[Fasauceome]

1.3 seems low for a 6 core for that platform.

[corrado33]

2 minutes ago, fasauceome said:

1.3 seems low for a 6 core for that platform.

Does voltage increase for chips with more cores? Say if I were OCing a 2 core 2 thread skylake chip then a 4 core 4 thread skylake chip, assuming the silicon was literally identical (minus the additional cores), would I need more voltage to OC the 4 core chip? 

[Fasauceome]

4 minutes ago, corrado33 said:

Does voltage increase for chips with more cores? Say if I were OCing a 2 core 2 thread skylake chip then a 4 core 4 thread skylake chip, assuming the silicon was literally identical (minus the additional cores), would I need more voltage to OC the 4 core chip? 

In my (albeit limited) experience, yes. I think the main limiting factor is that 4.0 all core is a very significant clock speed bump for a slightly older CPU, so it should take a little more than only 1.3 volts.

[-rascal-]

When you enabled XMP, changing your BCLK to 120, using a Cache Ratio of 34x is TOO HIGH.

That results in a Cache speed of ~4 GHz.

 

You might need more than 1.30V.

I don't remember of the the top of my head, but my i7-6800K @ 4.0 GHz required ~1.32V ... I think.

 

[MVollrath50]

1 hour ago, Nolanrulesroblox said:

have you tried reinstalling your bios? (that fixed it for my old Xeon server)

Yes i have the latest bios.

[MVollrath50]

47 minutes ago, -rascal- said:

When you enabled XMP, changing your BCLK to 120, using a Cache Ratio of 34x is TOO HIGH.

That results in a Cache speed of ~4 GHz.

 

You might need more than 1.30V.

I don't remember of the the top of my head, but my i7-6800K @ 4.0 GHz required ~1.32V ... I think.

 

okay thanks I will try that later

[MVollrath50]

54 minutes ago, -rascal- said:

When you enabled XMP, changing your BCLK to 120, using a Cache Ratio of 34x is TOO HIGH.

That results in a Cache speed of ~4 GHz.

 

You might need more than 1.30V.

I don't remember of the the top of my head, but my i7-6800K @ 4.0 GHz required ~1.32V ... I think.

 

also the bclk was automatically changed to 120 when the xmp was enabled

[-rascal-]

Just now, MVollrath50 said:

also the bclk was automatically changed to 120 when the xmp was enabled

 

Yep, same for me.

When I enabled XMP for my G.Skill TridentZ kit, it increased my BCLK to 125 MHz.

 

Drop your Cache Ratio so it runs at like 3.4 ~ 3.6 GHz.

[MVollrath50]

3 minutes ago, -rascal- said:

 

Yep, same for me.

When I enabled XMP for my G.Skill TridentZ kit, it increased my BCLK to 125 MHz.

 

Drop your Cache Ratio so it runs at like 3.4 ~ 3.6 GHz.

Thanks I'll give it a try when I get a Chance!

[MVollrath50]

Thank you everyone for all the helpful tips!

[MVollrath50]

1 hour ago, -rascal- said:

 

Yep, same for me.

When I enabled XMP for my G.Skill TridentZ kit, it increased my BCLK to 125 MHz.

 

Drop your Cache Ratio so it runs at like 3.4 ~ 3.6 GHz.

Also, did you change the CPU load-line Calibration to a different level?

[-rascal-]

13 hours ago, MVollrath50 said:

Also, did you change the CPU load-line Calibration to a different level?

 

CPU Load-Line level will vary a bit between CPUs and motherboard combination.

I did chance the LLC setting from Auto/Default.

You need to use the appropriate LLC setting to reduce V_DROOP on the Core Voltage.

 

Example:

You set your Core Voltage to 1.320V for 4.2 GHz in the BIOS.

When the CPU is under stress, say 100% load across all cores, Core Voltage drops down to 1.270V.

Too high of a CPU LLC setting, and your Core Voltage is 1.38V when CPU is under stress.

Too low of a CPU LLC settings, and your Core Voltage is 1.30V when CPU is under stress.

You might not get... 1.320V bang-on, but try to use the LLC level, that will give you the closest voltage.

[MVollrath50]

UPDATE:

I am able to get in to Windows now with the following changes: CPU: 34x, Cache: 27x, BCLK: 120, DRAM: 3200, VCore: 1.345, CPU input voltage, 1.800, LLC: Level 3.

 

But can only run Aida64 for only a couple minutes, what can I do to fix this? Is there any other stability test I should try? 

[fabarati]

Broadwell E can be annoying to OC, especially with XMP or if you have a chip with a weak IMC. Ignore the ram to begin with and make sure the BCLK is 100. Set the multiplier for all cores to 42x, the voltage to... 1.34V and see if it's stable. Then either increase the multiplier or decrease the voltage. After that, OC the ram. Instead of using XMP, OC it manually. Set the speed, timings and voltage to what it's supposed to be. If you're unstable, bump down the speed and/or timings.

 

Overclocking cache on BW-E is really not worth it (very little performance gains for a lot of heat and power draw), so 27x is good.

 

I have a 6850k that I got to 4.4GHz @ 1.35V with DDR4 at 3000 mhz, and a 6900k that I got to 4.3 GHz @ 1.32V using the same ram, but at 2800 MHz. The IMC on the 6900k is weaker. I could also clock both higher, but it got too hot and loud for my taste and my cooler.

[MVollrath50]

Thank you guys for all your help! I was able to OC everything and play CoD Black Ops 4 at Ultra fairly stable. I also was able to run Aida64 for 2.5 hours before exiting out of the stability test as well as a hour stress test in Intel XTU.  These are the OC settings I used

• CPU Multiplier: 42x
• Cache: 34x
• BCLK: 100
• VCore: 1.345
• Cache Voltage: 1.3
• CPU Input Voltage: 1.800
• LLC: Level 3
• DRAM: 3200 
• DRAM Voltage: 1.35 instead of the motherboards auto setting of 1.36

What do you guys think?

• XTU Benchmark Rating: 1744,1746, & 1748
• Cinebench R15: 1263 (Cinebench isn't registering the overclocking says: 3.4Ghz)
  • Single Core: 175
• CPU-Z Bench: Multi: 3828.5 & Single: 523.9
• Aida64 Extreme [Trial]  CPU Queen: 73533