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CPU base clock strange behavior

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#1
Hello!

I have this strange problem:

First, I changed the CPU base clock frequency from default 200 to 210. Firing up CPU-Z shows it [Bus Speed] at the expected 210 MHz, along with an expected CPU, NB and mem. freq. increase. But that is only when it the computer is relatively idle. When it gets some load, the base clock / bus speed starts fluctuating - randomly goes in the range of ~ 205 to 215 [along with changing the CPU, NB and mem clocks accordingly]

Today, I updated my BIOS and for this occasion decided to up it again, from 210 to 215. Now it goes completely out of whack on load - jumps around in the range of ~ 160 to 250 MHz. That doesn't look very "healthy" to me. My biggest concern is that during a frequency spike, it also sets my memory to run at a speed that I am not confident it can manage without any problems.

Any opinions / advice?
 

brandonwh64

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#2
Turn cool and quite off.
 
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Location
Kaunas, Lithuania
System Name Eternal WIP ][ HP ProLiant server blade
Processor AMD FX-8320 @ 4.4/4.1 GHz ][ 2x Intel Xeon L5520 @ 2.27GHz
Motherboard Asus Crosshair V Formula-Z ][ -
Cooling Corsair H55 ][ Stock
Memory 2x4GB Kingston HyperX Genesis @ 1866MHz ][ 4x4 GiB Hynix @ 1333 MHz; ECC on
Video Card(s) 2x MSI GeForce GTX 770 DirectCU II OC ][ None
Storage 1TB WD Black + 1.5TB WD Green + 750GB Samsung + 64GB OCZ Agility 4 ][ 3x 1 TB Hitachi
Display(s) Asus VG278H + Asus VH226H ][ None
Case Antec Nine Hundred ][ it's a server blade, lol
Audio Device(s) Supreme FX II (Integrated); Using optical S/PDIF output ][ none
Power Supply Corsair AX1200i ][ [stock]
Software Gentoo Linux ][ Linux Mint 16
Benchmark Scores 65970 BogoMIPS. Ha. Ha. Ha. >=|
#3
Thanks! This solves it.
Too bad it also disables Turbo. Would be nice to find a solution that would not disable Turbo, though...
 
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#4
is it not spectrum spread that changes that?
 
Joined
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Messages
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Kaunas, Lithuania
System Name Eternal WIP ][ HP ProLiant server blade
Processor AMD FX-8320 @ 4.4/4.1 GHz ][ 2x Intel Xeon L5520 @ 2.27GHz
Motherboard Asus Crosshair V Formula-Z ][ -
Cooling Corsair H55 ][ Stock
Memory 2x4GB Kingston HyperX Genesis @ 1866MHz ][ 4x4 GiB Hynix @ 1333 MHz; ECC on
Video Card(s) 2x MSI GeForce GTX 770 DirectCU II OC ][ None
Storage 1TB WD Black + 1.5TB WD Green + 750GB Samsung + 64GB OCZ Agility 4 ][ 3x 1 TB Hitachi
Display(s) Asus VG278H + Asus VH226H ][ None
Case Antec Nine Hundred ][ it's a server blade, lol
Audio Device(s) Supreme FX II (Integrated); Using optical S/PDIF output ][ none
Power Supply Corsair AX1200i ][ [stock]
Software Gentoo Linux ][ Linux Mint 16
Benchmark Scores 65970 BogoMIPS. Ha. Ha. Ha. >=|
#5
is it not spectrum spread that changes that?
Hmmm... I will try it w/ spectrum spread off & Cool 'n Quiet on then.

EDIT:
Can't find spectrum spread setting, but I remember it was there somewhere. Might have actually been in my previous mobo then.

BUT,
I found that disabling AMD APM [application power management] makes the base clock stable, even with CnQ on. Also, it appears Turbo won't work without APM. At least it downclocks & downvoltages idle cores. Oh well, sort of win, I guess...

P.S. I still saw the base clock to go down for very short amounts of time. It happens only when some game loads a LOT from the HDD. I saw it go down to 85 MHz for a sec once :twitch:
 
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