Overclock.net › Forums › AMD › AMD Motherboards › OC a Phenom 9950 2.6 BE on a Asus M3A78-EM
New Posts  All Forums:Forum Nav:

OC a Phenom 9950 2.6 BE on a Asus M3A78-EM

post #1 of 12
Thread Starter 
Hello everyone,

So I am attempting to Overclock the above mentioned CPU. The M3A78-EM has an "overclock profile" which you can set up to 10%. This auto sets all the correct parameters to achieve the desired effect and yields a modest 2.86 OC. I want to OC manually and take it up to 3.0 or even 3.2 if able.

I have tried setting the CPU / HT Reference Clock to 200 mhz, and the Frequency Multiplier to 15x. To get it to boot into windows I had to also change the following: +150mv (I am assuming this is .15) on the Processor Over Voltage setting. This setting allows me to specify 50mv, 100mv, or 150mv. There is also another setting for Processor -NB Volts, however I left this one alone.

What I noticed is that in CPUZ it shows my Core Speed as alternating between 1300 and 3000. The voltage alternates too. This doesn't seem right to me. I tried taking it up to 3.1 and it just says at 1300 in CPUZ.

Has anyone had any experience OC'ing on this particular motherboard? I am not quite sure that I am doing it right. Any help would be much appreciated.
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
post #2 of 12
Quote:
What I noticed is that in CPUZ it shows my Core Speed as alternating between 1300 and 3000. The voltage alternates too.
Is cool'n'quiet enabled or disabled? If cool'n'quiet is enabled it is normal that tihs happens when there is no load on the CPU. If it is disabled, you may have a case of VRM overheating.
post #3 of 12
Thread Starter 
Cool n' Quiet is indeed enabled. I will disable this and let you know the result soon.
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
post #4 of 12
That's fine, I recommend that for longer term purposes (i.e. chip longetivity when overclocked) you leave it on though. (i.e. turn it back on after finished testing). I also do recommend ensuring VRM cooling is present on that motherboard. You run a very power-intensive processor to begin with.
post #5 of 12
Thread Starter 
Thanks so much for your help! I disabled Cool n Quiet and checked in CUP-Z and it is running at 3100 Mhz stable. So basically when CnQ is enabled it downclocks the processor when your not running a CPU heavy process such as gaming? I will certainly go back into the BIOS and enable it again as you have suggested. The core voltage is 1.424v at 3.1 so I suppose it would not be good to run at that voltage all the time.

I do have VRM and it is enabled in the BIOS. I am also using aftermarket cooling on the CPU.

Let me ask you this, I have read that if you are going to overclock a CPU such as I have, you also should change the settings / clock speeds on the memory as well? Just trying to make sure that I am not overlooking anything.

Thanks again for your help!
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
post #6 of 12
No what xd is referring to is the area to the left of the cpu. Some boards have a heatsink attached to the vrms (the little boxes and capacitors). When you over-clock these can heat up and explode if not properly cooled. Motherboards that are serious about over-clocking will have some sort of heatsink to absorb and dissipate the heat generated by the increase in voltage required to over-clock.
Ronin
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Crosshair III Formula Radeon HD 5850 x2 Mushkin 1600 7-9-7-24 
Hard DriveHard DriveOptical DriveCooling
128GB Plextor ssd 500 GB WD Lite-ON multi-drive Corsair H100 
OSMonitorKeyboardPower
Windows 7 Ultimate 28" Hanns-G G110 Corsair HX850w 
CaseMouseMouse PadAudio
HAF 932 G500 X Trac pad Steelseries 
  hide details  
Reply
Ronin
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Crosshair III Formula Radeon HD 5850 x2 Mushkin 1600 7-9-7-24 
Hard DriveHard DriveOptical DriveCooling
128GB Plextor ssd 500 GB WD Lite-ON multi-drive Corsair H100 
OSMonitorKeyboardPower
Windows 7 Ultimate 28" Hanns-G G110 Corsair HX850w 
CaseMouseMouse PadAudio
HAF 932 G500 X Trac pad Steelseries 
  hide details  
Reply
post #7 of 12
Thread Starter 
I'm not sure if this board has that. I can't see anything on the capcitors directly to the left of the CUP, however there is something directly under the CUP before the PCIE slot.

Bit of an update, I changed the OC to 220 x 14 (3080). Instead of using 200 x 15. I also lowered the voltage a bit, so it is running at 1.136v

Not sure what the benefits of using a higher FSB and a lower multiplier would be, but I noticed that by default my FSB is set to 220.
Edited by watchmyback - 7/17/11 at 9:48am
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
post #8 of 12
well I Googled your board and you don't have any vrm heatsink. The heatsink under your cpu is your northbridge and the one below that is your southbridge. 1 of the benefits of higher fsb is faster memory response. When upping your fsb, your memory speed will raise, BUT you have to keep your memory speed within it's specifications or it will cause BSOD (ie. if it is 800MHz or 1066MHz). Upping the fsb will make your computer more responsive in all it's functions. Where just upping your multiplier, deals with just your cpu (if I understand it correctly).
Here is your motherboard.
You should fill out your system specs so anyone trying to help you has all your component information. You can go to your usercp at the top of this page and go to add system.
Edited by Ronin Tanker - 7/17/11 at 11:28am
Ronin
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Crosshair III Formula Radeon HD 5850 x2 Mushkin 1600 7-9-7-24 
Hard DriveHard DriveOptical DriveCooling
128GB Plextor ssd 500 GB WD Lite-ON multi-drive Corsair H100 
OSMonitorKeyboardPower
Windows 7 Ultimate 28" Hanns-G G110 Corsair HX850w 
CaseMouseMouse PadAudio
HAF 932 G500 X Trac pad Steelseries 
  hide details  
Reply
Ronin
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X6 1100T Crosshair III Formula Radeon HD 5850 x2 Mushkin 1600 7-9-7-24 
Hard DriveHard DriveOptical DriveCooling
128GB Plextor ssd 500 GB WD Lite-ON multi-drive Corsair H100 
OSMonitorKeyboardPower
Windows 7 Ultimate 28" Hanns-G G110 Corsair HX850w 
CaseMouseMouse PadAudio
HAF 932 G500 X Trac pad Steelseries 
  hide details  
Reply
post #9 of 12
Thread Starter 
Thanks for the information. I updated my system in the user cp as you suggested.
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
post #10 of 12
Thread Starter 
I did get this BSOD crash message today:

"A clock interrupt was not received on a secondary processor within the allocated time interval"

Maybe I'm not giving the CPU enough voltage. I think I am going to stick with my mobo's "overclock profile" of 10% and let it automatically adjust the bios settings for me. This will yield me 2.86 (and probably safe / stable), instead of a sketchy 3.08.
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD Phenom 9950 Quad-Core Black Edition 2.6 GHz Asus M3A78-EM eVGA GTX 260 Core 216 8 GB DDR2 
OSMonitorCase
Windows 7 Home Premium 64-Bit ASUS 24" Cyberpower Nemesis 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD Motherboards
Overclock.net › Forums › AMD › AMD Motherboards › OC a Phenom 9950 2.6 BE on a Asus M3A78-EM