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wombatman · 11-16-2005, 01:12 PM

Short Description: When the computer is under load, it will shut down, seemingly because of the CPU trying to pull more than needed. What can I do to fix this?

Long Description: I have a 3.2Ghz Prescott overclocked to 3.6Ghz with an XP-120 and Panaflo High speed fan on it. Ambient case temp is about 28-30 deg C (which, given that in South Carolina and the highs are still in the 70s, isn't too bad). Idle, the CPU is about 44-45 deg C. Under load, it gets to about 60 deg C.

Computer parts:
Asus P4P800E-Deluxe (I believe the CPU volt drooping is the major problem here, as detailed below)
3.2E P4
6800GT
7 case fans
420W Thermaltake Power Supply (about 2 years old)

Voltages (according to Asus Probe):
+12 = 11.9 (idle) to 11.7 (load)
+5 = 5.1 (idle/load)
+3.3 = 3.39 (idle/load)
VCore = 1.5V idle, drops to 1.40-1.44 under load

About the CPU Vcore drooping. Basically, to do my overclocking, I have to set the VCore much higher in BIOS than it actually needs to be because when the CPU is under load, the voltage supplied by the board drops. Thus, to supply the ~1.4V needed for the CPU to function under load at 3.6Ghz, I have to set VCore to 1.5000V or 1.4875V in the BIOS to try and account for the drop.

Is there anything anyone can suggest (other than lowering the clock, preferably) to combat this problem? I think the problem is that the Vcore drops too low for just a second, causing the computer to shut down. I believe this because I have no trouble with the computer if it is not left under load for a long time. For instance, I don't have trouble with games or short-term loads.

11-16-2005, 01:12 PM	#1 (permalink)
wombatman Insane	Power Problems Short Description: When the computer is under load, it will shut down, seemingly because of the CPU trying to pull more than needed. What can I do to fix this? Long Description: I have a 3.2Ghz Prescott overclocked to 3.6Ghz with an XP-120 and Panaflo High speed fan on it. Ambient case temp is about 28-30 deg C (which, given that in South Carolina and the highs are still in the 70s, isn't too bad). Idle, the CPU is about 44-45 deg C. Under load, it gets to about 60 deg C. Computer parts: Asus P4P800E-Deluxe (I believe the CPU volt drooping is the major problem here, as detailed below) 3.2E P4 6800GT 7 case fans 420W Thermaltake Power Supply (about 2 years old) Voltages (according to Asus Probe): +12 = 11.9 (idle) to 11.7 (load) +5 = 5.1 (idle/load) +3.3 = 3.39 (idle/load) VCore = 1.5V idle, drops to 1.40-1.44 under load About the CPU Vcore drooping. Basically, to do my overclocking, I have to set the VCore much higher in BIOS than it actually needs to be because when the CPU is under load, the voltage supplied by the board drops. Thus, to supply the ~1.4V needed for the CPU to function under load at 3.6Ghz, I have to set VCore to 1.5000V or 1.4875V in the BIOS to try and account for the drop. Is there anything anyone can suggest (other than lowering the clock, preferably) to combat this problem? I think the problem is that the Vcore drops too low for just a second, causing the computer to shut down. I believe this because I have no trouble with the computer if it is not left under load for a long time. For instance, I don't have trouble with games or short-term loads.