CPU Voltages for A64 x 2 4800+

[Ridesy]

Hi All,

I have been following Zebos basic OC guide and am concerned that even with mild OC from stock 200 x 12 at 1.34v I am having to up CPU voltage to 1.40v to get a prime 95 stable 217 x 200.

I had been advised that "in general" you should be able to OC by as much as 10% on stock voltages, but mine bombs out everytime (even running 3DMark06) with CPU anything over 210 x 12 unless voltage is at 1.40v (even happens at 1.385v setting).

Question 1. - is this normal?
Question 2. - where is best to check CPU/MOB temps, as Asus Probe (came with MOB) shows as high as 52C CPU after 20 minutes of prime 95 (twin instances), but SIS SAndra shows mid 30's! and BIOS shows High 30's????
Question 3 - at what point does temperature pose a threat to these A64 x 2 CPU's?

Thanks for any answers.

Ridesy

 

[letdown427]

Probably best to stay below 1.45v

BIOS temps should be accurate, try speedfan too. That seems a weak overclock, could be a bad processor. Is it one intance (one core inparticular?) that's failing prime95?

You could be getting some voltage drop under load, maybe keep an eye on voltages (speedfan can do that too, as can other apps probably)

 

[TrevorRC]

Did you remember to downclock your memory?

 

[Bobthelost]

Voltage is more dangerous to current gen CPUs than temp is, temp will make your CPU unstable but running at a higher voltage will shorten your CPU's lifespan no matter how cold it is.

However i run my 4400X2 @ 1.47V and the peak temps hit 52*C (2.58Ghz). Other people use 1.5V but i don't need the extra performance and can't be bothered with the risk. 1.45 is supposed to be relativly safe.

The 4800X2 is not going to overclock all that much on stock settings (proportionally), for a start you're already @2.4Ghz so there isn't all that much more headroom around. You're looking @ 2.5Ghz there anyway which is pretty good for stock.

I'd think about a better HSF, you shouldn't be that high, you still using stock?