Opteron 185 Undervolting OC'ing?

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Ok,
I managed to find myself a nice Opty 185 dual core to replace my single core 144.

I have had it a few days now and have had a bit of a play with it.

Stepping is CCBBE 0615 DPMW with the hardware in my sig.

Firstly I decided to find if I was stable at stock...managed 10 hours on Orthose blend test no problems.

Opty185StockOrthosStable10hours.jpg



I then wanted to find the max of the CPU.
So,... in the usual way, place the ram on a harsh divider [100MHz / 1/02] to remove it from the clock, changed the LDT/FSB to X2 then started to increase the FSB by 5 MHz and see if get Windows boot and Straight in for Super PI...take it from there.

I soon hit a bit of a wall on stock volts I could only manage 210 MHz into windows but this would fail Super PI
I increased the voltage slightly to 1.375V (stock 1.35v) and still the same, went to 1.40 V and no joy there. :confused:

I then remembered someone posting something about undervolting, so I dropped the voltage to 1.30v and I managed to get to 215 MHZ (2795.6 GHz) not a lot further than stock 2.6 GHz :(

This however wasn't stable in Orthoes :eek:

So, the question is am I missing something here ?
I am a novice when it comes to dual core OC'ing anyone shed a little light or part with some wisdom ?
 
Last edited:
mattyrigby00 said:
undervolting reduces stability, and heat at the same time. dual core ocing is the same as single core

If what you say is true, then...I should try higher than 1.40 V ? :confused:
 
some chips are very funny about how the ram is set. try running 180/166/133 or even 200 div on the ram, and htt at 4/5. see if it helps.

try and see if tis voltage scaling, eg try 202fsb lowest orthos fft stable volts, then 204, 206 etc see if its suddenly jumping skywards.

- i get 2.85 @ 1.35, 2.92 @ 1.4, 3 @ 1.55 (jump!) 3.1 @ 1.7V (jump!)
 
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