Overclock.net › Forums › AMD › AMD CPUs › HT Link speed, Bus speed and NB Frequency is throttling.
New Posts  All Forums:Forum Nav:

HT Link speed, Bus speed and NB Frequency is throttling.

post #1 of 5
Thread Starter 
Hi guys im new on this forum as new at overclockin, I got a problem where my HT link speed, bus speed and NB will throttle sometimes for no reason like the ht link speed will go down from 2000 to 1971 then 1 sec laters its 2000, this makes my cpu speed sometimes throttle from 3.8 to 3.4 and so on, Why does it do this? I also noticed that my bus speed is 200.7 not 200, and HT link 2006.6 and throttles 0.6-0.8 all the time same with NB, same thing happend with the cpu voltage sometimes the voltage can go up and down from 1.416 to 1.428 like every 2 second or something really anooying, but found a sweet spot which stays 1.368 all the time and 1.380 only on 100% full load.

I have a Phenom II X4 965 overclocked to 3.8 1.368vcore
Asus M5A97 PRO mobo
Corsair VX450 PSU
Corsair XMS3 8GB RAM 1333Mhz
'
it is stable but I still dont understand why the values are not excatly like 200,2000,2000 and stay like that all the time.

AMD cool and quit is disabled
C1E is disabled also
EPU power saving is disabled (default)

I cant get any reason why it does this, my bios is 1503, 1 step under the newest bios update so I dont think its something with bios.

so why does my cpu go down to 3.4, 3.5 sometimes then 1 sec later 3.8ghz?

I also noticed under heavy full load it will stay 3.8 ghz all the time even tho the buss speed, ht link speed and NB still throttles a litle bit.

Also what is VRM Fixed Frequency Mode?

Peace
Edited by Denebz - 11/5/12 at 8:57am
post #2 of 5
Thread Starter 
bump!
post #3 of 5
I'll be honest with you here. I used to be pretty up to date on all of this stuff, but I've been "out of the game" for just over two years (grad school frown.gif) and some of these things I can't quite remember the exact reasons for. So I hope someone with a better memory comes and answers some of this stuff for us both smile.gif.

I think I might be able to help out with a number of things though.

Clock speeds are based on the reference clock as you know. And just like anything else, I believe that they have a variance built into them (just like a PSU, it has + or - a certain percentage). So having the reference clock vary a bit is perfectly normal. So don't worry about that. The other values are of course calculated based on that (and multiplied) so if you have a small difference in ref clock it will show up as a much larger variance in NB frequency and things like that.

If I'm not mistaken, this same principle could also apply to your CPU voltages. All PSU's have variance in the 12v rail, but that might be a bit more variance than others. I can't recall exact numbers anymore frown.gif.

I DON'T however have a reason for why your CPU idles at a lower frequency if you have cool & quiet and other things turned off. Have you tried adjusting your power plan preferences in windows? That might have something to do with it.

And I couldn't tell you what VRM Fixed Frequency mode is. I did some quick googling, but didn't find anything useful. Hopefully someone else will know.

Hope some of this helps, and good luck man smile.gif.
post #4 of 5
Thread Starter 
Yeah I have the windows thing on max performance, it pissed me off when the cpu speed throttles like from 3.8 ghz to 3.6 ghz and next second later is .3.8 ghz again, it happends that sometimes , I dont get why it happends. I saw on many people they have like the perfect 200.0 buss , 2000.0 HT link and like a perfect 3800.0 ghz and so on when mine is like 200.7 bus and 2006.7 HT link (the HT link varies from 2006.7-8 sometimes), what can be wrong? this is just annoying grr.
post #5 of 5
Hi there, I realize I am a year late.. Hopefully you have figured out that this variance can come from a few separate sources.
1. The most likely source is a bios power-saving setting that is still enabled (i.e. Energy Saving mode) on the cpu.
2. If you are severely over-volting your MB/CPU I have seen instances such as cpu speed throttle.

There may be other factors in play here I have just listed past problems that I have ran into, but I would bet that "1" above is your issue. I would also recommend updating your BIOS, and consulting your user manual if you still have it laying around(many companies have it available for download).

I want to also add that for my system's BIOS I have also disabled the following power-saving options:
Including the ones you have listed, plus
-cpu load-line calibration
-amd application power management
-core c6 mode

-D33PZ3R0
cheers.gif
Edited by D33PZ3R0 - 2/10/13 at 8:27am
myRig
(11 items)
 
  
CPUMotherboardGraphicsRAM
AMD3+ FX8350 Asrock Fatal1ty 990x PNY Nvidia GTX 660Ti Fermi gSkill Trident 
Hard DriveCoolingOSKeyboard
gSkill SSD Dark Night (Air Cooled) Win7, VMWARE(everything you can think of) cyborg 
PowerCaseMouse
EVGA Supernova 750W Full Modular Cougar R.A.T. 5 
  hide details  
Reply
myRig
(11 items)
 
  
CPUMotherboardGraphicsRAM
AMD3+ FX8350 Asrock Fatal1ty 990x PNY Nvidia GTX 660Ti Fermi gSkill Trident 
Hard DriveCoolingOSKeyboard
gSkill SSD Dark Night (Air Cooled) Win7, VMWARE(everything you can think of) cyborg 
PowerCaseMouse
EVGA Supernova 750W Full Modular Cougar R.A.T. 5 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › HT Link speed, Bus speed and NB Frequency is throttling.