Voltage Fluctuation??? ~N00b Here!~ - Overclock.net - An Overclocking Community

Forum Jump: 

Voltage Fluctuation??? ~N00b Here!~

 
Thread Tools
post #1 of 8 (permalink) Old 03-22-2019, 12:08 PM - Thread Starter
New to Overclock.net
 
Join Date: Mar 2019
Location: Oregon, USA
Posts: 9
Rep: 1 (Unique: 1)
Voltage Fluctuation??? ~N00b Here!~

Ok, So I'm a bit new to this scene - trying my hand at overclocking an 8700K (not delidded) with a Corsair H100i-v2 AIO cooler using the stock thermal pad.

Right now I have my Vcore voltage set at 1.3v @ 4.8GHz on all cores. When stress testing on Prime95 v26.6 I'm seeing my voltages sitting around 1.26v instead of the 1.3v that I have it set at in BIOS, and the voltages between cores isn't exactly consistent but pretty close.

Is this because I still have C-states enabled? Do I even want to force the CPU to run at exactly the voltage I set it at so long as it isn't turboing (disabled) to higher voltages and temps?

Stress testing for 30 minutes I got a max spike temperature of 81C and a max average temperature (hottest core) of 76C.

It feels snappy and stable right now but I feel like I have more temperature headroom given the fact that Prime95 creates temperatures unlike any "normal" workload would, even heavy gaming.

Also I feel like it's worth mentioning that my ambient temp is quite low this morning (~15C) with the window open and air purifier fan blasting, I have to take that into consideration right? Even if I'm using an AIO water cooler?

Thanks for any feedback, can't wait to see what this thing can do!

-Bryant
spitfire6147 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 03-22-2019, 12:10 PM
The last VRM burner
 
Join Date: Mar 2018
Posts: 1,672
Rep: 28 (Unique: 15)
It's because of too low Load Line Calibration.

PC for all
(20 items)
CPU
i7 5775c @4.2GHz/3.8GHz
Motherboard
Gigabyte Z97X Gaming 5
GPU
Soon to be 2070 Super FE
RAM
KHX24C11T3K2/16X 11-12-12-32-1T-250
Hard Drive
Corsair MP510
Hard Drive
Samsung Evo 860
Power Supply
SeaSonic Focus Plus 750W
Cooling
Raijintek Tisis lapped+ Thermal Grizzly Kryonaut
Cooling
Arctic P12 PWM x2
Cooling
Arctic P14 x4
Case
LianLi 330X
Operating System
Windows 10 64-bit Pro
Monitor
Benq GL2250 80Hz
Keyboard
Corsair Strafe Red Silent
Mouse
SteelSeries Rival 310
Mousepad
Artisan FX Raiden
Audio
Audio in Motion SC808 + MUSES8820 + 2x 2xLME49990
Audio
AKG M220
Other
NZXT Hue+
Other
Mayflash F300 Arcade Stick
▲ hide details ▲
BroadPwns is offline  
post #3 of 8 (permalink) Old 03-22-2019, 12:14 PM - Thread Starter
New to Overclock.net
 
Join Date: Mar 2019
Location: Oregon, USA
Posts: 9
Rep: 1 (Unique: 1)
Should I worry about adjusting it if the PC is stable though? I have AC/DC LLC set to Performance but I didn't adjust LLC to the CPU itself.
spitfire6147 is offline  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old 03-22-2019, 01:08 PM
The last VRM burner
 
Join Date: Mar 2018
Posts: 1,672
Rep: 28 (Unique: 15)
Don't bother if it's stable.

PC for all
(20 items)
CPU
i7 5775c @4.2GHz/3.8GHz
Motherboard
Gigabyte Z97X Gaming 5
GPU
Soon to be 2070 Super FE
RAM
KHX24C11T3K2/16X 11-12-12-32-1T-250
Hard Drive
Corsair MP510
Hard Drive
Samsung Evo 860
Power Supply
SeaSonic Focus Plus 750W
Cooling
Raijintek Tisis lapped+ Thermal Grizzly Kryonaut
Cooling
Arctic P12 PWM x2
Cooling
Arctic P14 x4
Case
LianLi 330X
Operating System
Windows 10 64-bit Pro
Monitor
Benq GL2250 80Hz
Keyboard
Corsair Strafe Red Silent
Mouse
SteelSeries Rival 310
Mousepad
Artisan FX Raiden
Audio
Audio in Motion SC808 + MUSES8820 + 2x 2xLME49990
Audio
AKG M220
Other
NZXT Hue+
Other
Mayflash F300 Arcade Stick
▲ hide details ▲
BroadPwns is offline  
post #5 of 8 (permalink) Old 03-22-2019, 03:40 PM - Thread Starter
New to Overclock.net
 
Join Date: Mar 2019
Location: Oregon, USA
Posts: 9
Rep: 1 (Unique: 1)
Thank you!
spitfire6147 is offline  
post #6 of 8 (permalink) Old 03-22-2019, 03:58 PM
Overclocker
 
JackCY's Avatar
 
Join Date: Jun 2014
Posts: 10,008
Rep: 339 (Unique: 240)
Take a multimeter and check the actual voltages instead of relying on software monitoring using the built in often poor sensors.

Plus LLC depends on specific CPU if it's only LLC for input voltage such as on quite a few Intel CPUs or it's LLC for the actual core voltage... which on modern Intel CPUs you can't adjust anyway as it all goes automatic through LDOs but it's called in UEFI as Vcore anyway because most people don't know the differences.
LLC is sometimes low sometimes stupidly high. You have to check what your mobo is doing with LLC.
JackCY is offline  
post #7 of 8 (permalink) Old 03-22-2019, 04:13 PM - Thread Starter
New to Overclock.net
 
Join Date: Mar 2019
Location: Oregon, USA
Posts: 9
Rep: 1 (Unique: 1)
I have 2 LCC options in BIOS:

"CPU Internal AC/DC Load Line"
"CPU Vcore Loadline Calibration"

Can you explain the difference?

Thanks for the reply!

-B
spitfire6147 is offline  
post #8 of 8 (permalink) Old 03-22-2019, 04:25 PM
The last VRM burner
 
Join Date: Mar 2018
Posts: 1,672
Rep: 28 (Unique: 15)
Vcore will affect your core Voltage, AC/DC I'd give a shot on affecting Input Voltage, which I wouldn't bother about at all.

PC for all
(20 items)
CPU
i7 5775c @4.2GHz/3.8GHz
Motherboard
Gigabyte Z97X Gaming 5
GPU
Soon to be 2070 Super FE
RAM
KHX24C11T3K2/16X 11-12-12-32-1T-250
Hard Drive
Corsair MP510
Hard Drive
Samsung Evo 860
Power Supply
SeaSonic Focus Plus 750W
Cooling
Raijintek Tisis lapped+ Thermal Grizzly Kryonaut
Cooling
Arctic P12 PWM x2
Cooling
Arctic P14 x4
Case
LianLi 330X
Operating System
Windows 10 64-bit Pro
Monitor
Benq GL2250 80Hz
Keyboard
Corsair Strafe Red Silent
Mouse
SteelSeries Rival 310
Mousepad
Artisan FX Raiden
Audio
Audio in Motion SC808 + MUSES8820 + 2x 2xLME49990
Audio
AKG M220
Other
NZXT Hue+
Other
Mayflash F300 Arcade Stick
▲ hide details ▲
BroadPwns is offline  
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Overclock.net - An Overclocking Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off