Nekochan Net

Thanks for the replies!!

So what about using the core from an Octane 360 module, putting it into an original O2 R12K/300 module? Could this then be adjusted to give an O2/425 or better?

I could move the resulting spare 300 core into an O2 250 module and either leave it at 300 or maybe oc a little.

I wondered whether using an original O2/300 module to hold a core from an Octane/360 would make changing the clock to 400+ easier compared to trying
to put anything quicker than a 300 into a 250 module.

However, atm I'm stuck anyway because I still don't know what resistors to move in order to attain a 3.5X multiplier on an O2 module.

Ian.

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The problem I believe is the 360's and 400's are soldered to the board and are not removable. The R12k-360 is basically a binned R12k-400, so basically if you're overclocking these you are limited to how far you can push the chips.

I have a dead O2 module that has had the 350 hack which surfaced recently, I will try to take a pic tomorrow and post it up for comparison.

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Oh!! I thought the soldered ones started at 400. Ah well.




Ok, thanks!

Ian.

Can't believe I actually missed this thread; silly to resurrect it like this, but... has anyone got proper/clear instructions on how to overclock an r12k 300MHz to 350MHz in an O2? I'm reading a multiplier needs to be set at 3.5 from a stock 3.0, but $random_deity knows were or how...

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If relevant bits were copied to the wiki, we would have a reference point for this topic.

R.

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I still don't know what the resistor positions are for the 350 setting. Got a stack of 250s to mod.

Ian.

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(bump)

Does anyone happen to have pics showing the correct resistor positions for setting 350MHz on an O2 R12K CPU module?

Ian.

I thought that the R10K/R12K set its clock frequency (PClk, a multiple of the SysClk signal from the board) based on a 64-bit word written by the chipset at reset time. So I don't understand how moving resistors can affect that. The multiplier is part of the data contained in the serial ROM on the module, I thought.

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And I thought a DM 10 was something special

In reality, the resistors change the multiplier just like on a old peecee .... been there, done that.

Yep, but I'm still not sure what the resistor positions should be to set a 350Mhz clock. Does anyone know? Or
preferably have pics? Searching the archive doesn't help, web/image link refs are defunct.

I've done a 300, worked fine, but I'd like to try a 350.

Ian.

_________________
SGI Systems/Parts/Spares/Upgrades For Sale: http://www.sgidepot.co.uk/sgidepot/
mapesdhs@yahoo.com, ian@sgidepot.co.uk, +44 (0)131 476 0796, check my auctions on eBid!

Also still interested in this. My O2 already is a 300MHz, so 50 extra wouldn't kill it... but I don't want to risk blowing it up for lack of proper instructions.

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