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Help needed massive vdrop(?)

post #1 of 7
Thread Starter 
Hello !

I'm a new member of these forums but i've been visiting this site for some time now. I've tried to find a solution for this problem for a couple of hours but i couldn't find anything useful so I'm sorry if there are other threads about this.

I have used my Amd x4 955BE at 3,4ghz with stock voltage ~1,34v for almost a year now without problems so i decided to try to oc it a bit more because the temps were cool and extra performance was welcome. So i got it to 3,6ghz with 1,44v and ran prime95 for a couple of hours and it was stable with the max temp at 58C. All the games ran well like they should but when i went to some mmo's bigger pvp fights with dozens of other players, I noticed the fps to drop to 2 - 5 for 5-10 seconds. Then I ran prime95 again and I noticed that the cpu's vcore dropped to 1,06 for that time and then went back up! I've tried to raise the voltage to 1,49 and the LLC option in bios at different percentages but nothing seems to help. This doesn't happen at the stock voltages in which I can use the cpu at 3,4ghz. Any ideas? All the help is apprecitiated and thanks in advance! smile.gif

English isn't my native language so there may be mistakes



Radeon hd 5870 Vapor-X
Amd x4 955BE
Asus M4N78
Chieftec 700W CFT-700-14CS
4gb ram (don't remember)
post #2 of 7
The problem is your VRM on the mobo. They are overheating.
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CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
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LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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post #3 of 7
Thread Starter 
Thank you for the advice, now when I watched closer for the link between the drop and mobo temps i noticed that everytime one of the mobo's temps reaches 53C this drop happens! And when the temp has went down to 48C or so, the voltage goes back up. Any advice how to get it cooler and i wonder what part of the board it is. I guess somewhere close to the cpu
post #4 of 7
Quote:
Originally Posted by Tobias1212 View Post

Thank you for the advice, now when I watched closer for the link between the drop and mobo temps i noticed that everytime one of the mobo's temps reaches 53C this drop happens! And when the temp has went down to 48C or so, the voltage goes back up. Any advice how to get it cooler and i wonder what part of the board it is. I guess somewhere close to the cpu
If you can find them.Enzotech MOS-C1 and a fan would work go.
HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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HTPC
(11 items)
 
  
CPUMotherboardRAMHard Drive
AMD A-3870K AsRock A75 Pro (FM1) HyperX DDR3 1866 8 GB SAMSUNG 830 256gb 
Hard DriveOptical DriveCoolingOS
SAMSUNG EcoGreen F4 2TB Plextor Black Blu-ray Burner Phenom II X4 stock Cooler Windows 10 
MonitorPowerCase
LG M2762D-PM Glossy Black 27" 5ms (1920x1080) Antec HG 900 Gerenic ATX Case 
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post #5 of 7

The M4N78 uses a lowly 3+1 phase setup, based on tests and ratings on later ASUS motherboards with (better/improved) 3+1 phase setups, this board is not ready for the 955 BE or any other 125W TDP quad core processor. You need to replace your motherboard if you want reliable operation without throttling. VRM heatsinks may help to some extent, but the reality is that this is a capacity issue and you will eventually run into it again at some point as a result of over-time degradation.

post #6 of 7
This is a common problem with motherboards that are a 3+1 or even a 4+1 configuration. Some of them just blow up under stress and take the CPU down with them. Fortunately, ASUS has a throttling mechanism that kicks in when the load gets too high, cutting the voltage and the CPU speed to safe levels.

The best long-term solution to the problem is to upgrade the motherboard. There's nothing wrong with the M4N78 when it's used within specifications, but it can't deal with an overclocked Deneb.

There's a sticky on the main AMD Motherboards forum page that links to a database of different AMD motherboards, showing which ones have VRM's capable of running 125W or 140W TDP Phenom II's and FX processors.
     
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AMD Athlon X4 870K 4700mhz 1.63v ASUS A88X-PRO Radeon HD 6970 G.SKILL Ripjaws X Series 16GB DDR2133 
Hard DriveHard DriveHard DriveHard Drive
Kingston V300 Toshiba 2.5" laptop HDD, 1TB Micron C300 SSD Generic 2TB HDD WL2000GSA1672 (external) 
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Seagate Momentus XT 500GB ASUS DVD-RW Prolimatech Black Series Megahalems Linux Mint 18 Cinnamon "Sarah" 
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Windows 10 ViewSonic VG2030wm IBM Model M Fractal Design Newton R3 600W 
CaseMouseAudioOther
Phanteks Enthoo Pro Logitech Marble Mouse Behringer UCA222 Upgraded Realistic Minimus-7 speakers, Lepai 20... 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo Mobile T9900 Dell 0G848F Intel Mobile 4 series 4GB Crucial DDR2-6400 
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CPUMotherboardGraphicsRAM
AMD Athlon X4 870K 4700mhz 1.63v ASUS A88X-PRO Radeon HD 6970 G.SKILL Ripjaws X Series 16GB DDR2133 
Hard DriveHard DriveHard DriveHard Drive
Kingston V300 Toshiba 2.5" laptop HDD, 1TB Micron C300 SSD Generic 2TB HDD WL2000GSA1672 (external) 
Hard DriveOptical DriveCoolingOS
Seagate Momentus XT 500GB ASUS DVD-RW Prolimatech Black Series Megahalems Linux Mint 18 Cinnamon "Sarah" 
OSMonitorKeyboardPower
Windows 10 ViewSonic VG2030wm IBM Model M Fractal Design Newton R3 600W 
CaseMouseAudioOther
Phanteks Enthoo Pro Logitech Marble Mouse Behringer UCA222 Upgraded Realistic Minimus-7 speakers, Lepai 20... 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo Mobile T9900 Dell 0G848F Intel Mobile 4 series 4GB Crucial DDR2-6400 
Hard DriveOptical DriveOSMonitor
OWC Mercury Electra 3G 44GB SSD stock DVD-RW Linux Mint Cinnamon 17.1 "Rebecca" 1366x768 WXGA 
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post #7 of 7
Thread Starter 
Ok thanks a lot for the replies! I will look for a better mobo and maybe i should upgrade cpu while i'm at it, but let's see smile.gif Before this i had no clue about those features but now i know.
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