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Whats up with CPU Speed and Multiplier Fluctuating?

post #1 of 9
Thread Starter 
So I was attempting to help someone in another thread. His problem and what we discovered were probably unrelated, but here is what we learned. His CPU speed was fluctuating anywhere from 1.8ghz to 3.whaterver in CPU-Z. I thought this was weird because every time I've looked at my 965 BE at home, it reads out a constant speed, Idle or at load. But I looked at CPU-Z on more than 2 computers at work and they were jumping around as well, one is an AMD custom build with an Asus mobo and the other is a Dell T3400. The multiplier kept changing with the speed.

I guess it's working as intended but I have no idea what the function is. Whats the deal?
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post #2 of 9

What version of CPU-Z do you have at home? The newer versions show what's going on more accurately, but it's actually nowhere near as accurate as what Real Temp shows. Watch the speed and multiplier in Real Temp once.

 

The truth is, our CPU clocks never stop moving.

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post #3 of 9
Thread Starter 
Im using 1.52.2. I only see a difference from 3.8 to 3.799. And I see that my multiplier seems to be locked. I have my BIOS set for a specific multiplier of 19. On these other computers, I can only assume that they are set to auto and something is calling the shots in the background.

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Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
CoolingCoolingCoolingCooling
2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... 2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red 
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post #4 of 9
Thread Starter 
Some related posts. I'm curious to know the actual background of the fluctuations. Is this some kind of background cpu/power saving process?

http://www.overclock.net/t/1406041/unstable-core-speed/0_20
The Water Ninja
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Pepto Pony
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MrDVR
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Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
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2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... 2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red 
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Microsoft Windows 7 Ultimate Toshiba Regza 52" 1920 x 1080 @ 120Hz  Microsoft Wireless Comfort 5000 Keyboard and Mouse SeaSonic M12II 750 
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FX-4300 Gigabyte GA-78LMT-USB3 EVGA Geforce GTX 260 G.Skill Ripjaws X 
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Corsair SSD Samsung 7200 Laptop drive Some DVD Burner I took out of a dead Dell. Noctua NH-C12P SE14 
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Dell 19" 16:9 Logitec wireless Enermax 650w Apevia X-Cruiser3 Pink 
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A6-6400K Dual Core MSI A78M-E35 Onboard 4Gb G.Skill Ripjaws 1600Mhz (2 x 2) 
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Intel 320 SSD Western Digital 2.5" 1Tb 7200rpm  LG External Blue-ray Combo Drive Noctual NH-L9a 92mm SS02 
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Windows 7 Ultimate 64bit Toshiba Regza 52" 1080p Logitech K400 Antec EarthWatts Green EA-380D 
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The Water Ninja
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Pepto Pony
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Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
CoolingCoolingCoolingCooling
2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... 2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red 
CoolingCoolingCoolingCooling
Bitspower Dual / Single D5 Top Upgrade Kit 100 ... ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump 
CoolingCoolingCoolingCooling
Bitspower D5 Mod Top V2 Pom version Alphacool NexXxos UT60 Full Copper Radiator 240 Noctua NF-A6X25 FLX Quiet Computer Cooling Fan ... NZXT Sentry Mesh Fan Controller w/ Five 30 watt... 
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Microsoft Windows 7 Ultimate Toshiba Regza 52" 1920 x 1080 @ 120Hz  Microsoft Wireless Comfort 5000 Keyboard and Mouse SeaSonic M12II 750 
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My TV Stand Cabinet Creative Sound Blaster X-Fi Titanium 
CPUMotherboardGraphicsRAM
FX-4300 Gigabyte GA-78LMT-USB3 EVGA Geforce GTX 260 G.Skill Ripjaws X 
Hard DriveHard DriveOptical DriveCooling
Corsair SSD Samsung 7200 Laptop drive Some DVD Burner I took out of a dead Dell. Noctua NH-C12P SE14 
MonitorKeyboardPowerCase
Dell 19" 16:9 Logitec wireless Enermax 650w Apevia X-Cruiser3 Pink 
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A6-6400K Dual Core MSI A78M-E35 Onboard 4Gb G.Skill Ripjaws 1600Mhz (2 x 2) 
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Intel 320 SSD Western Digital 2.5" 1Tb 7200rpm  LG External Blue-ray Combo Drive Noctual NH-L9a 92mm SS02 
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Windows 7 Ultimate 64bit Toshiba Regza 52" 1080p Logitech K400 Antec EarthWatts Green EA-380D 
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post #5 of 9
Quote:
Originally Posted by wizardonthejob View Post

Im using 1.52.2. I only see a difference from 3.8 to 3.799. And I see that my multiplier seems to be locked. I have my BIOS set for a specific multiplier of 19. On these other computers, I can only assume that they are set to auto and something is calling the shots in the background.

 

Yeah, use a newer version of  CPU-Z and then you will see it on your computer too. The version you have doesn't have the new code or new engine or whatever CPUID did to it relatively recently.

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250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
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i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #6 of 9
Thread Starter 
Just installed the new version and I now see the multiplier spectrum. But I'm still getting the same very slight variations in clock speed that I saw before, only from 3.799 to 3.9 ghz, and the multiplier never changes, even when running Prime95. The computers I have work have the newer version, but they show drastic, constant changes in clock speed, more so with Prime95 running. Is this a function of the processor, the motherboard or windows, or a combination of any?

The Water Ninja
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Pepto Pony
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MrDVR
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AMD FX-8350 @ 4.8Ghz CROSSHAIR V FORMULA-Z MSI GTX 980 Gaming 4g 16Gb G. Skill Ripjaws 4x4 @ 1600 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
CoolingCoolingCoolingCooling
2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... 2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red 
CoolingCoolingCoolingCooling
Bitspower Dual / Single D5 Top Upgrade Kit 100 ... ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump 
CoolingCoolingCoolingCooling
Bitspower D5 Mod Top V2 Pom version Alphacool NexXxos UT60 Full Copper Radiator 240 Noctua NF-A6X25 FLX Quiet Computer Cooling Fan ... NZXT Sentry Mesh Fan Controller w/ Five 30 watt... 
OSMonitorKeyboardPower
Microsoft Windows 7 Ultimate Toshiba Regza 52" 1920 x 1080 @ 120Hz  Microsoft Wireless Comfort 5000 Keyboard and Mouse SeaSonic M12II 750 
CaseAudio
My TV Stand Cabinet Creative Sound Blaster X-Fi Titanium 
CPUMotherboardGraphicsRAM
FX-4300 Gigabyte GA-78LMT-USB3 EVGA Geforce GTX 260 G.Skill Ripjaws X 
Hard DriveHard DriveOptical DriveCooling
Corsair SSD Samsung 7200 Laptop drive Some DVD Burner I took out of a dead Dell. Noctua NH-C12P SE14 
MonitorKeyboardPowerCase
Dell 19" 16:9 Logitec wireless Enermax 650w Apevia X-Cruiser3 Pink 
CPUMotherboardGraphicsRAM
A6-6400K Dual Core MSI A78M-E35 Onboard 4Gb G.Skill Ripjaws 1600Mhz (2 x 2) 
Hard DriveHard DriveOptical DriveCooling
Intel 320 SSD Western Digital 2.5" 1Tb 7200rpm  LG External Blue-ray Combo Drive Noctual NH-L9a 92mm SS02 
OSMonitorKeyboardPower
Windows 7 Ultimate 64bit Toshiba Regza 52" 1080p Logitech K400 Antec EarthWatts Green EA-380D 
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The Water Ninja
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AMD FX-8350 @ 4.8Ghz CROSSHAIR V FORMULA-Z MSI GTX 980 Gaming 4g 16Gb G. Skill Ripjaws 4x4 @ 1600 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 PRO 128Gb SSD Intel 160 Gb SSD Intel 250 Gb SSD Generic DVD-RW 
CoolingCoolingCoolingCooling
2 x Noctua (NF-P12-1300 )1300rpm Premium Silent... 2 x Corsair Air Series SP120   COUGAR CF-V12H Vortex Hydro-Dynamic-Bearing  Monsoon 90° Rotary Angle Fitting - 5/8" - Red 
CoolingCoolingCoolingCooling
Bitspower Dual / Single D5 Top Upgrade Kit 100 ... ModMyToys DreamFlex Premium 3/8" ID Tubing Reta... Coolance Liquid Coolant Bottle, 700mL Fluoresce... Coolance PMP 450 Variable Speed D5 Pump 
CoolingCoolingCoolingCooling
Bitspower D5 Mod Top V2 Pom version Alphacool NexXxos UT60 Full Copper Radiator 240 Noctua NF-A6X25 FLX Quiet Computer Cooling Fan ... NZXT Sentry Mesh Fan Controller w/ Five 30 watt... 
OSMonitorKeyboardPower
Microsoft Windows 7 Ultimate Toshiba Regza 52" 1920 x 1080 @ 120Hz  Microsoft Wireless Comfort 5000 Keyboard and Mouse SeaSonic M12II 750 
CaseAudio
My TV Stand Cabinet Creative Sound Blaster X-Fi Titanium 
CPUMotherboardGraphicsRAM
FX-4300 Gigabyte GA-78LMT-USB3 EVGA Geforce GTX 260 G.Skill Ripjaws X 
Hard DriveHard DriveOptical DriveCooling
Corsair SSD Samsung 7200 Laptop drive Some DVD Burner I took out of a dead Dell. Noctua NH-C12P SE14 
MonitorKeyboardPowerCase
Dell 19" 16:9 Logitec wireless Enermax 650w Apevia X-Cruiser3 Pink 
CPUMotherboardGraphicsRAM
A6-6400K Dual Core MSI A78M-E35 Onboard 4Gb G.Skill Ripjaws 1600Mhz (2 x 2) 
Hard DriveHard DriveOptical DriveCooling
Intel 320 SSD Western Digital 2.5" 1Tb 7200rpm  LG External Blue-ray Combo Drive Noctual NH-L9a 92mm SS02 
OSMonitorKeyboardPower
Windows 7 Ultimate 64bit Toshiba Regza 52" 1080p Logitech K400 Antec EarthWatts Green EA-380D 
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A piece of plywood and some zip ties. Onboard Hauppauge WinTV HVR-2250 dual tuner card. 
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post #7 of 9
Quote:
Originally Posted by wizardonthejob View Post

Just installed the new version and I now see the multiplier spectrum. But I'm still getting the same very slight variations in clock speed that I saw before, only from 3.799 to 3.9 ghz, and the multiplier never changes, even when running Prime95. The computers I have work have the newer version, but they show drastic, constant changes in clock speed, more so with Prime95 running. Is this a function of the processor, the motherboard or windows, or a combination of any?

 

It could be the way you have your BIOS set up, or it could be that they have Intel CPUs (do they?), or it could be something else. Either way, what you're seeing on their computers is what I'm seeing on mine with these newer versions of CPU-Z. They're trying to give us a more accurate readout, but they're still behind Real Temp.

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It's a computer!
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i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #8 of 9
Try enabling Cool n Quiet in bios, and Balanced power setting in windows to see if phenom downclocks at idle.
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miso-o
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post #9 of 9
The reason why you are seeing the fluctuations is from either AMD Cool n Quiet or Intels Enhanced Speed Step w/ CxE power gating techniques to only use as much processing power depending on the load. EIST Link AMD CnQ

Like my cpu is set up that when its at idle or very light loads its runs at around 1.6ghz @ 1.0v and at full load it goes to 4.5ghz @ 1.2v. EIST does all the in between automatically and helps save power and helps lengthen the life of a overclocked cpu that is not being ran 24/7. Not to mention helps keep heat down too on light loads so you dont have to keep the cpu running at higher voltage. Power difference between both from wall is 60w at idle up to 160w full load depending on whats being crunched.

Side note tho is that some sleep states dont work properly when overclocked on intel setups because of using overvolted CPU PLL if i remember correctly. And it makes some overclocks unstable in the intermediate ranges between idle and full load frequency/voltages. Hence why some stick with just using a fixed voltage and multiplier and nothing using the CnQ or EIST dynamic frequency/voltage approach.
Edited by terraprime - 7/1/13 at 10:10pm
 
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intel Core i5 3570k 4.5ghz 1.200v - 0.000 offset  Gigabyte z77X-UP4 TH Beta Bios F11C with lastes... Sapphire 7950 3GB @ 1200/1600mhz v1.299 - Curr... GSkill 2x4gb 1333mhz 7-7-7-21 2T @ 1600 8-8-8-2... 
Hard DriveCoolingOSMonitor
Crucial M4 128GB SSD SATA 3.0 M4-CT128M4SSD1 Corsair H80i AIO liquid cooling Windows 7 Professional x64 47 inch Samsung LCD HD TV 
PowerAudio
750w PC Power single rail stock 
CPUMotherboardGraphicsRAM
C2Q Q6600 GO @ 3.2ghz 1.28 Gigabyte P35 DS3-L Pencil modded Nvidia 9800 GT 512mb 2x1gb Gskill 1066 5-5-5-15 & 2x1gb Gskill Pi 80... 
Hard DriveHard DriveOptical DriveCooling
Crucial m4 CT128M4SSD1 128GB SSD - OS Drive Samsung HD103UJ & SJ 1 Terabyte HDD LG 22x DVD burner Arctic Freezer Pro 2  
OSMonitorPowerCase
Windows 7 Pro SP1 x64 HannsG 27.5" Widescreen Red thingy 750w Single rail old raidmax from 1st build beat to death 
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