Pushing my Opty a little further

sepulchre

sepulchre

sepulchre

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I have the opty in my sig and its been running without any problem for the last 3 weeks on stock volts at 2.8Ghz and 36C idle/42C full load (pap case cooling). On a 3/4 divider with mem at 200Mhz.

So i'd like to push it a bit further to 2.9 or even the magical 3.0Ghz I'm hoping this may be possible as its stable at the above voltages.

Whats the best way of ramping this up?

Thanks in advance.
 
Keep the LDT multi low
Keep the memory divider high (as in, keep the memory close to 200 Mhz)
POSSIBLY slacken the memory timings
Up the HTT

:D

You'll probably find the on-die memory controller is the weakest point, which is why you need to be gentle with the memory settings.

You will also find the CPU speed MORE than makes up for slack memory speeds / timings. Don't sacrifice 1 Mhz of CPU speed for 10 Mhz of memory speed for example. Do some benches and see.
 
Cheers Jimbo.

In the past I've had it boot into windows at 2.9Ghz but it wasnt stable (although I didnt touch any voltages etc) and when trying 300x10 on a 2/3 divider it would post but then fail straight away, again I didnt touch any voltages.

I'm still new to A64 OC'ing but 2.8 seemed easy to figure out and achieve as all I needed to do was set the mem to 200Mhz and apply a 3/4 divider. But to go from here I'm a little lost, for 2.9 would I be better using a different divider or increasing the mem frequency? (I'm guessing a different divider, but which?)
 
from what ive read, the best way is to slacken the divider and timings on the ram while you concentrate getting the cpu to 2.9/3.0 whatever stable. Then you start to up the divider etc. on the ram, testing for stability at every increase.

Getting to 2.8 on stock volts is very impressive, so try upping the volts to 1.425 and see if it helps. hope this helps.

andy
 
Thanks for the help!

I've left the multiplier as it is at the moment and made the following changes -

FSB 280 -> 290Mhz
CPU Voltage 1.376 -> 1.425v
Chipset Voltage 1.5 -> 1.7v
LDT 1.2 -> 1.3v

So I'm now running at 2.9Ghz and about to prime for a while.

I'll post back in an hour or so :D
 
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Ah I see, well the RAM's running now at 207 so not much over its ratted speed at 2-3-3-8 (had problems at 2-3-3-6 on SuperPi but slackening them relieved this).

The load temp is hovering around 49C, the PWMIC (I've no idea what this is!) is also at 49C, and the chipset's at 42C this is a bit of an increase over my load temps of 45C at 2.8Ghz. Although I've not found any chip that runs cool in this wavemaster case.

No problems so far on Prime, I know its not long but I'm happy not to have it error out like some people seem to very quickly :)

So do I go higher now?? And then do a thorough stress test?
 
Got it to 2.9Ghz at 1.4v. Each time I try and go much above this it locks up. I think this may be it. I'm a little hesitant to put any more volts through it as my temps are high anyway and its a good chip, not one I want to kill.

Unless anyone can convince me to break the 50C mark under load ;)

I'm going to stress test tonight at this speed.

Jimbo - LDT is at 3x
 
From what I've seen your chip is 3GHz capable. I'd maybe look at a new heatsink and give it 1.5v, or even better a Watercooling setup.

OT: Jimbo does your RAM really need 3.4v for 212MHz?:eek:
 
I think your right it could do 3Ghz, I'm currently using a new A64 Freezer pro cooler. Although I think the main issue is air flow inside the case (or lack of it).

Still 2.9Ghz isnt to be sniffed at ;)

edit/ isnt water cooling kind of expensive to get in to?
 
Hey sepulchre, i've got exactly the same stepping 146 and sounds like its performing similar.

I've tried pretty much everything i know to get it stable at anything over 2850 but its not having any of it! Im sure these things are safe up to around the 60c mark, i tried primeing mine last night at 2.9ghz after putting the vcore up to 1.575v's... temps were maxed out at 52c for around an hour before it failed the torture test and im not pushing my luck anymore its just not worth it when i can run it slightly over stock volts at 2.8ghz/46c under load.

Maybe we should just admit defeat? Although it looks like yours will do a little more with less voltage... get it up to 1.55v's ;) and yeah u might wanna sort your colling out aswell :)
 
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