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Athlon 65nm Voltage Question

post #1 of 3
Thread Starter 
Just a question and maybe some feedback of other members who have killed 65nm (Brisbane in paticular) AMD chips with Vcore.

I'm pretty familiar with 90nm chips and what they can handle, but what about the 65nm Brisbane chips? I built a rig for my nephew this past Christmas for his first setup because he's been getting into computers and OC'ing, and his pre-build wasn't doing him any favors, lol.

So anyways, to my question. I've heard from various sources that 1.5v would be the limit for a daily used PC with 65nm as long as temps are fine. So, theoretically speaking, how much voltage do Brisbane A64 x2's on water (temps never exceed 42c @ 1.488v) handle, and at which point does Vcore become a "sudden death" issue?
post #2 of 3
Quote:
Originally Posted by *ka24e* View Post

J1.5v would be the limit for a daily used PC with 65nm as long as temps are fine. ... and at which point does Vcore become a "sudden death" issue?

AsI understand it, there is no "death" voltage, but anything over stock voltage is "slow death".

It has to do with "electrron migration". The traces (wiring) inside the chip are so small (only a few molicules thick in places) that electrons flowing through there small conductors can actually knock off molecules. When that happens resistance goes up and so does heat. Assuming AMD shoots for a life span of 10-20 years for their chips, they choose an operating voltage accordingly. I have read that constant high voltage will decrease a CPU's capacity for overclocking.

Personally (I have an FX57) I try and stay under 1.4v for everyday use. though I have been as high a 1.6v for benchmarking at times with no obvious ill effects.
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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post #3 of 3
Thread Starter 
So 1.5V would be the limit then huh. Well that's not too bad considering. On my x2 4200+ (90nm Manchester) I hit 1.675v on a couple occasions for mostly suicide runs, but it didn't seem to damage it. I did manage to get (or we did, lol) his 5000+ to 3.3Ghz @ 1.488v core, but anything beyond 3.3ghz needs well over 1.5v to be stable.

Looks like were already at the limit then with almost 1.5v, lol. Thanks for the reply. +rep.
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