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CPU-Z Core speed keeps changing

post #1 of 5
Thread Starter 
Just wondering why my CPU-Z core speed keeps switching from 2328.1Mhz to 3492.0MHz as it does this the multipler changes from 6 to 9. The bundled ASUS utility says the same thing but CoreTemp shows no change. I'm running on an E8400 at just below 3.5GHz. What do you think could be causing it?
4GHZ 24/7
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E8400 - 4GHZ @ 1.352V Asus P5K-SE PowerColor 5770 - 940/1340 4GB DDR2-1066 G-Skill 
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4GHZ 24/7
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 - 4GHZ @ 1.352V Asus P5K-SE PowerColor 5770 - 940/1340 4GB DDR2-1066 G-Skill 
Hard DriveMonitorPowerCase
2.2TB across 3 disks 27" LG 600W Coolermaster Thermaltake Soprano 
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post #2 of 5
That's speedstep; it changes speed to save power.
You can turn it off in the BIOS
 
Lappy 486
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Xeon E5450 @ 4.4GHz Asus P5Q-E P45 HD4870 1GB @ 800/1100 8GB OCZ Reaper DDR2 1066 
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Lappy 486
(13 items)
 
 
CPUMotherboardGraphicsRAM
Xeon E5450 @ 4.4GHz Asus P5Q-E P45 HD4870 1GB @ 800/1100 8GB OCZ Reaper DDR2 1066 
Hard DriveOptical DriveCoolingOS
Samsung EVO 500GB SSD + Half a dozen old HDDs LG DVD-RW IDE!! Xigmatek S1283 Windows 7 SP1 x64 
MonitorKeyboardPowerCase
2560x1440 + 1920x1080 Logitech G510 XFX 450w Antec 900 
Mouse
Logitech G700 
CPUMotherboardGraphicsRAM
i7 3520M @ 2.9GHz Some HM67 thing HD4000!! 16GB DDR3 1066 
Hard Drive
Samsung 840 250GB SSD + 2TB Samsung M9T 
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post #3 of 5
Intel Speedstep.
Magnum
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Magnum
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Phenom II X4 840 Some crappy thing Galaxy GTS450 6GB DDR3 PC10600 
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Seagate 1TB Samsung DVDRW 20x Win 7 23" AOC 
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Kingston Slimtype Tt TR2 600W CM Centurion 5 
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post #4 of 5
It is a feature called C1E/EIST/ or Speed Step in your BIOS. It is a power saving feature. Whenever you are idle, your multiplier will drop down to 6, which will decrease your clock speed to save power, but it will jump back up to max overclock, like you have already experienced, once you load something that uses the CPU, like a stress test program.

There is no harm on leaving it enabled. Laptop uses this feature, as well.
Emily
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Emily
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CPUMotherboardGraphicsRAM
Q6600 G0 3.24GHz w/ 1.4v Gigabyte DS3 rev 3.3 Galaxy GTX 460 2x1GB G.Skills DDR2 800 NR 
Hard DriveOSMonitorKeyboard
WD Cavier 250GB + SimpleTech 320GB EXHDD Windows 7 x86 Samsung 19" SyncMaster 940BW Pencil 
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OCZ 600w GameXStream COOLER MASTER Centurion 5 Dog Paper 
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post #5 of 5
Thread Starter 
Great thanks for you help.
4GHZ 24/7
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 - 4GHZ @ 1.352V Asus P5K-SE PowerColor 5770 - 940/1340 4GB DDR2-1066 G-Skill 
Hard DriveMonitorPowerCase
2.2TB across 3 disks 27" LG 600W Coolermaster Thermaltake Soprano 
  hide details  
Reply
4GHZ 24/7
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 - 4GHZ @ 1.352V Asus P5K-SE PowerColor 5770 - 940/1340 4GB DDR2-1066 G-Skill 
Hard DriveMonitorPowerCase
2.2TB across 3 disks 27" LG 600W Coolermaster Thermaltake Soprano 
  hide details  
Reply
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