Gaming Rig Random BCLK Spikes 99.98~102.3

JySzE · Jun 12, 2014

Basic Specs:

OS: Win 8.1 64bit
Mobo: Asus Sabertooth Z77 (BCLK set to 100)
CPU: i7 3770k 4.7GHz @ 1.304v (c states, spread spectrum, BCLK recovery disabled)
PSU: XFX XXX Pro850w

At idle and at full load very randomly the BCLK will spike from a
steady 99.98 to 99.98~102.55 never higher than 102.55.

Im aware that BCLK fluctuations are normal ie ( 99.98~100.11 etc etc)
But 99.98~102.55 seems problem some.

Should i be concerned about this? Because this could be a software error but if not im worried about my vcore being to high for a certain clock, if the BCLK were to increase and raise the core speed wouldn't at that moment
the core speed require more voltage than set? Creating a whea error making me believe that i need more voltage than i actually do? And im actually increasing the vcore higher than i really need to compensate for the BCLK spikes?

JySzE · Jun 13, 2014

Bump

Kokin · Jun 13, 2014

I wouldn't be worried if you're not getting any errors or problems. Do a stress test to see if you get any type of instability, if so just bump your voltage up one or two clicks.

JySzE · Jun 13, 2014

Quote:

Originally Posted by Kokin

I wouldn't be worried if you're not getting any errors or problems. Do a stress test to see if you get any type of instability, if so just bump your voltage up one or two clicks.

IBT Test:

Runs: 100
Stress Level: Maximum (15238MB)
Gflops: 112 (HT on)
Passed No WHEA 19 Errors

P95:

Time: 36Hrs
Passed: No WHEA 19 Errors, No P95 errors or lock ups

Temps for both:
Max: 64c 2nd core

Ive always been stable but it just worries me since spikes like that randomly can make my GPU unstable while gaming and compensating for a spike like that with more vcore isnt something id like to do.

Thinking that it may be Win 8's doing, Im going to roll back to win 7 and re test.

gonX · Jun 13, 2014

Your GPU shouldn't be going unstable because of that. It's only a frequency fluctuation of up to 2.3%.

Don't forget if your VCore is "slow" in relation to your multiplier your core frequency will at most have a (Max_FSB_Fluctuation * multiplier) difference

Kokin · Jun 13, 2014

GPU instability during gaming is another issue altogether and shouldn't be related to your CPU. Yes they work together during gaming, but having your CPU go between 4800MHz and 4820MHz should not cause any form of GPU instability.

What instability are you experiencing for your GPU?

JySzE · Jun 13, 2014

Quote:

Originally Posted by gonX

Your GPU shouldn't be going unstable because of that. It's only a frequency fluctuation of up to 2.3%.

Don't forget if your VCore is "slow" in relation to your multiplier your core frequency will at most have a (Max_FSB_Fluctuation * multiplier) difference

My apologies i assumed it would effect my GPU because with BCLK overclocking it also affects more than just the CPU multi. Like the PCIE etc etc. Right?

Or does it only affect the bandwidth of the PCIE?

And in regards to the VCore Im stable @ 1.304v (FSB:100 * 47Multi)

But when it fluctuates to (FSB:102.55 * 47Multi)= 4819.85Mhz

Is this requiring me to add extra voltage to my OC to keep stablity due to the fluctuations, could i be using less vcore with a more stable FSB on a different mobo?

Because @ (FSB:100 * 48Mutli) im stable @ 1.358v

When the Frequency jumps from 4698.90 to 4819.85 my Voltage is only @ 1.304v So is this amount of VCore to be stable actually more vcore than i would actually need for the 4.7Ghz OC due to the fact that the FSB is fluctuating? Or is the fluctuation itself so fast and insignificant that it won't be affected by the insufficient amount of vcore being delivered @ moment of the fluctuation, And is actually the correct amount of vcore for the OC?

Im just confused how my frequency can change from 4698.90 to 4819.85 without any additional VCore to stabilize that increase. My guess is that im giving it more than enough vcore for a 4.7Ghz OC and at point of the fluctuation im giving it just the right amount of vcore that it is also stable when it hits 4.8Ghz.

Thanks for the response.

Quote:

Originally Posted by Kokin

GPU instability during gaming is another issue altogether and shouldn't be related to your CPU. Yes they work together during gaming, but having your CPU go between 4800MHz and 4820MHz should not cause any form of GPU instability.

What instability are you experiencing for your GPU?

Its not 4800MHz to 4820MHz Its 4698.90 ~ 4819.85Mhz +120Mhz randomly

And im not having any GPU instability at the moment, Im just assuming since the Bus speed and the PCIE are connected it could cause instability. Due to the fluctuations. I thought that it could mess with my GPU OC and due to the fluctuations i wasn't able to get the most out of that OC either. I thought increasing the PCIE frequency might also increase the cards frequency

No idea if that is correct or not.

Im not having any instability whatsoever. With any component.

Im just worried that the fluctuations may be effecting the amount of VCore that i actually require for a certain clock.

I could be entirely wrong and there could be nothing to worry about. Im just EXTREMELY thorough. And seeing those spikes and having the probability that i could be getting away with less vcore and a higher OC with both my CPU and GPU is something im going to pursue to get answers.

Thanks for the response.

gonX · Jun 13, 2014

The graphics card is not clocked using the PCI-E bus as a reference, it is clocked completely separately. The input clock is obviously the PCI-E clock, which can cause instability when it's too high - but ~2.5% is low enough that I wouldn't worry about it. It purely affects transfer bandwidth, which would unlikely be maxed with PCI-E 3.0

Your CPU having issues could be a thing, but consider your CPU as 4820 MHz instead of 4.7GHz and adjust accordingly from that.
Do you know when the PCI-E clock changes? If it's set to auto in the BIOS it could be autoclocking related.

JySzE · Jun 13, 2014

Quote:

Originally Posted by gonX

The graphics card is not clocked using the PCI-E bus as a reference, it is clocked completely separately. The input clock is obviously the PCI-E clock, which can cause instability when it's too high - but ~2.5% is low enough that I wouldn't worry about it. It purely affects transfer bandwidth, which would unlikely be maxed with PCI-E 3.0

Your CPU having issues could be a thing, but consider your CPU as 4820 MHz instead of 4.7GHz and adjust accordingly from that.
Do you know when the PCI-E clock changes? If it's set to auto in the BIOS it could be autoclocking related.

Thats what i thought thanks for the info on that.

The PCIE Clock changes when the BCLK fluctuation happens right? Since they are linked??

The BCLK is set to 100.00 in the bios, I set it manually.

gonX · Jun 13, 2014

I actually don't know if BCLK is linked to the PCI-E clock, but I would assume so.

JySzE · Jun 13, 2014

Quote:

Originally Posted by gonX

I actually don't know if BCLK is linked to the PCI-E clock, but I would assume so.

So i have narrowed it down.

Saw that my CPU bus speed : DRAM speed ratio mode was set to auto

Changed it to 100:100

I tried these following programs to check the BCLK after changing the "CPU bus speed : DRAM speed ratio"

CPU-Z,OCCT,Argus Monitor, HWiNFO64. HW Monitor, CoreTemp, Real Temp, Asus Suite.

CPU-Z:99.98

OCCT: 99.98

Argus: 99.98- but increased to 106 BCLK when opened Cpu-z (Typical software confliction i closed cpu-z and restarted Argus and it showed 100 for 30 min straight on load and idle)

HWiNFO64: 99.98

HW Monitor: 99.98

CoreTemp: 99.98

Real Temp: 99.98

Asus Suite: 99.98

Upped my BCLK to 100.1 And got 100.10~.12

Seems to have fixed the problem when your post gave me a clue to search for a auto clocking for the BCLK. Thanks

Quote:

Originally Posted by gonX

Do you know when the PCI-E clock changes? If it's set to auto in the BIOS it could be autoclocking related.

gonX · Jun 14, 2014

Good to hear

jasjeet · Jun 15, 2014

Did you try disabling CPU Spread spectrum? It varies the bclk to avoid EM Interference.

JySzE · Jun 15, 2014

Quote:

Originally Posted by jasjeet

Did you try disabling CPU Spread spectrum? It varies the bclk to avoid EM Interference.

Yes that was always disabled

TLM-610 · Jun 17, 2014

I can also confirm this with my board. Mine is hitting 4835Mhz but I checked and all the settings were correct. This has only happened ones. I also retested for instability and the system is rock solid. That was 12 days ago gaming. I have to mention my multi is x48

TLM-610 · Jun 24, 2014

I guess it is normal with Asus top mid-range mobos, mine also seems to do the same but remains completely stable even as you can see in the eventviewer (completely clear). I only get SharedAccess_NAT errors when I go online, that's why am offline at that time when testing.

Gaming Rig Random BCLK Spikes 99.98~102.3

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