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Do I need more power?

post #1 of 5
Thread Starter 
I'm trying to push my OC kind-of to the limit. you can see pretty much what I've got below, with the only change being the CPU Cooler; to a Grand Kama Cross.

I read some have pushed the Opti 1381 to 4.01 GHz, and I'm getting closer and closer, which makes me want it more and more.

My current setup is this:
Ref: 310
CPU multiplier max'd: 12.5 => 3.875
NB multi: 8x => 2480
HT multi: 7X => 2170
Mem multi: 5.33X => 1652, at stock 1600 settings: 11-11-11-30-2T-40
Mem volts: 1.75V
NB volts: 1.2
SB volts: 1.2
CPU NB VID: 1.45
CPU: 1.5V

This is the closest I've come to stable. I've the opti's don't gain much past 1.4-1.45.
4 minutes into a prime95 run, the PC shut down HARD. Wouldn't power up for anything. When its been too much clock or too many volts, the machine will reboot or freeze, or it won't get past the bootloader, but I've fixed that with clearing the cmos.
This time was different. Turned off PSU, unplugged....When I opened the case, nothing smelled burnt. Nor was anything exceptionally hot. I pulled the video card, connected to the onboard GPU and for grins gave it a whirl. She powered right up. So, to me, that points to PSU. Any other thoughts?
At 300 MHz ref clock, the max temps are 45C cpu, 68 NB. When this one shut down, it was well below that.
mainline
(15 items)
 
  
CPUMotherboardGraphicsRAM
Opteron 1381 Gigabyte MA790FXT-UD5P Radion 4850hd Patriot Sector 5 
Hard DriveHard DriveOptical DriveCooling
WD-640AAS caviar black OCZ Agility 3 does it really matter? Scythe Orocchi 
OSMonitorPowerCase
Ubuntu 64bit Samsung 2233 X2 Seagate 850 W Silver Certified Logisys 
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mainline
(15 items)
 
  
CPUMotherboardGraphicsRAM
Opteron 1381 Gigabyte MA790FXT-UD5P Radion 4850hd Patriot Sector 5 
Hard DriveHard DriveOptical DriveCooling
WD-640AAS caviar black OCZ Agility 3 does it really matter? Scythe Orocchi 
OSMonitorPowerCase
Ubuntu 64bit Samsung 2233 X2 Seagate 850 W Silver Certified Logisys 
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post #2 of 5
I am assuming that this is a cheap or generic power supply because I've never heard of "Nexus". You see, the problem is probably that this PSU is unable to handle the stress due to a poor delivery of power. For overclocking, it's critical to have a PSU that's good at delivering clean and stable power as well as being able to handle the added stress of overclocking. I'm not talking about overall power capacity here, but just the PSU's general quality.

So can you tell me everything you know about your PSU? If it turns out that it is basically just a cheapie, then I will recommend that you stop overclocking immediately because there is a risk of PSU failure which has a history of killing an entire system.
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) 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 (24" 1920 x 1080 144Hz G-SYNC) 
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) 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 (24" 1920 x 1080 144Hz G-SYNC) 
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #3 of 5
From what I found on Google the Nexus 500 is a re-branded Fortron AX500-A. Here's a review from 2005.
Hopefully that helps.

Edit: Just a thought, your mobo has no cooling on the mosfets and that might affect overclocking.
Edited by Laylow - 5/31/11 at 10:42pm
post #4 of 5
Quote:
Originally Posted by TwoCables View Post
I am assuming that this is a cheap or generic power supply because I've never heard of "Nexus". You see, the problem is probably that this PSU is unable to handle the stress due to a poor delivery of power. For overclocking, it's critical to have a PSU that's good at delivering clean and stable power as well as being able to handle the added stress of overclocking. I'm not talking about overall power capacity here, but just the PSU's general quality.

So can you tell me everything you know about your PSU? If it turns out that it is basically just a cheapie, then I will recommend that you stop overclocking immediately because there is a risk of PSU failure which has a history of killing an entire system.
Nexus is a brand that.....well this link will explain HERE.

They make a bit of everything.
post #5 of 5
Thread Starter 
I got a broken link from above, but but I picked the power supply up due to the review on spcr. Seemed stable, able to handle more than it was rated for, and quiet under modest loads. SPCR likes other nexus models as well.
As mentioned above, the mobu has no hs on the mosfets, but the finger touch method has them pretty cool. still, I'm adding one......
mainline
(15 items)
 
  
CPUMotherboardGraphicsRAM
Opteron 1381 Gigabyte MA790FXT-UD5P Radion 4850hd Patriot Sector 5 
Hard DriveHard DriveOptical DriveCooling
WD-640AAS caviar black OCZ Agility 3 does it really matter? Scythe Orocchi 
OSMonitorPowerCase
Ubuntu 64bit Samsung 2233 X2 Seagate 850 W Silver Certified Logisys 
  hide details  
Reply
mainline
(15 items)
 
  
CPUMotherboardGraphicsRAM
Opteron 1381 Gigabyte MA790FXT-UD5P Radion 4850hd Patriot Sector 5 
Hard DriveHard DriveOptical DriveCooling
WD-640AAS caviar black OCZ Agility 3 does it really matter? Scythe Orocchi 
OSMonitorPowerCase
Ubuntu 64bit Samsung 2233 X2 Seagate 850 W Silver Certified Logisys 
  hide details  
Reply
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