Athlon X2 AM2 volt/cap damage = overheat?

[Uranium-235]

so, I got this HP 4400+ am2 to fix. It overheats, and turns off. cpuid shows volts at 1.68, I think this isn't accurate...

anyways, I run prime95 and the temp skyrockets, 70..80, fan spins up high, temp raises, and it finally turns off a second or so later. Arctic silver'd by another one of her friends, so I know it isn't a thermal transfer issue

had bad KGZ's, which I replaced with pannys, still does the same thing, put good PSU in it, still does the same thing. Put a 4200+ in there I had lying around and the temp regulates properly, maximum 74c under prime95 highest stress load

sooo, did the caps cause the thermal diode or a thermal regulator on the chip to...die? but other then overheating, the there is no other signs of instability, even with the bad caps


bad caps attached

[Uranium-235]

Re: Athlon X2 AM2 volt/cap damage = overheat?

hmmmmmmmm

here is a pic of the CPU. there are some brown pins

[b700029]

Re: Athlon X2 AM2 volt/cap damage = overheat?

I cannot find the datasheets with the relevant information on AMD's site (unlike Intel) but 1.68V is very high! Specification for vcore is ~1.4V. Use a voltmeter on the VRM output to determine the true voltage. 74c is also very high for that processor (again, AMD documentation is somewhat lacking in terms of "absolute maximum ratings" and the like). The 4200+ runs at a slightly lower frequency so it may still be getting overvolted but is not heating up as much.

[Colt45ws]

Re: Athlon X2 AM2 volt/cap damage = overheat?

What sort of heat sink does it have on it? Sort of looks like it might have a pretty generic extruded heatsink suited to something like the 45W LE1620 chip I have and not much else.
I have noticed on my Athlon X2 system, voltage goes up under load as well. I ended up being able to pull 100mV through the BIOS before stability suffered. If I get a chance tomorrow, Ill set it back to stock and put it under load to see what it goes to.

[Uranium-235]

Re: Athlon X2 AM2 volt/cap damage = overheat?

it looks like he normal stock amd heat sink for the am2 series

[joshnz]

Re: Athlon X2 AM2 volt/cap damage = overheat?

I have noticed on my Athlon X2 system, voltage goes up under load as well. I ended up being able to pull 100mV through the BIOS before stability suffered. If I get a chance tomorrow, Ill set it back to stock and put it under load to see what it goes to.

Under Vista and win7 (maybe other systems) the power management scales the core speed/voltage.
At idle my Cpu is at 0.98volts @ 802.7MHz
At max load my cpu is at 1.37volts @ 3511.6MHz

From http://products.amd.com/(S(34bjkzvfd...f10=&f11=&f12=
Processor AMD Athlon™ X2
Model 4400+
OPN Tray ADO4400IAA5DO
OPN PIB ADO4400DOBOX
Operating Mode 32 Bit Yes
Operating Mode 64 Bit Yes
Revision G2
Core Speed (MHz) 2300
Voltages 1.325/1.35/1.375V
Max Temps (C) 55 to 68
Wattage 65 W
AMD Virtualization Technology Yes
L1 Cache Size (KB) 128
L1 Cache Count 2
L2 Cache Size (KB) 512
L2 Cache Count 2
L3 Cache Size (KB) 0
CMOS 65nm SOI
Socket AM2
AMD Business Class No
Black Edition No

[Uranium-235]

Re: Athlon X2 AM2 volt/cap damage = overheat?

so, do you think the voltage regs on the motherboard have gone south?

[PCBONEZ]

Re: Athlon X2 AM2 volt/cap damage = overheat?

Either that or you've lost a VID signal or the controller is bad or the voltage reading is bogus.
.
VID signal is something like 5 or 7 'lines' that latch high or low to tell the controller what voltage to set Vcore at.
A blown or missing SMD resistor would be enough to muck that up.
.
Check the voltages with a meter.
The on-board sensors are usually cheap parts.
.

[Uranium-235]

Re: Athlon X2 AM2 volt/cap damage = overheat?

but that would explain why it runs hotter then usual, even with good paste

[joshnz]

Re: Athlon X2 AM2 volt/cap damage = overheat?

what is the mainboard model number?

[mathog]

Re: Athlon X2 AM2 volt/cap damage = overheat?

Try it in another motherboard, preferably one you can live without if it is damaged further (one with a blown network interface or similar not relevant for this test damage). Get straight into the BIOS and watch the temperature. If it rises as before then the chip is fried, if not, there is a problem with the other motherboard. I have never seen a CPU break so that it overheats, but it is certainly within the realm of possibility. The brown spot would be consistent with a regional CPU failure. But not definitive, look at the first motherboard and see if there are any smoked components underneath that part of the chip. (Not sure if that is possible with this CPU, it was with the Athlon XP).