[weblacky]

Hi All,
I just bought a dead Fuel (hopefully it will ship soon). So I revisited this thread. I noticed one element that wasn’t confirmed, that I heard somewhere, about PIMM down-grades:

Can I run a higher speed PIMM on flashed, lower speed settings, i.e. can I take a 700 MHz Fuel with PIMM installed and working, flash for a 500 MHz PIMM and the existing 700 Mhz PIMM will boot and run fine…at 500 Mhz?

I ask this because, years ago, I was given the impression (via online statements I cannot, now, locate) that Fuel boards set for lower speed PIMMs could still have a higher PIMM thrown in, work, and be then flashed to the new correct speed.

Is this true?

My personal reason for asking is, if I get the dead Fuel I just bought, the owner claimed it’s a 700 MHz (no proof, could be anything?). I have a 600Mhz PIMM that needs repair given to me by a user here.

If the system boots after my efforts. I wanted to “down clock it” to work on this problem PIMM. Should that not give fruit, I need to go back to the original PIMM (assuming it’s faster, for now). So I need an escape hatch to not paint myself into a corner!

Anyone out there brave enough (that maybe has two fuels) that can down-clock a higher speed fuel to a lower speed and be able to use their other PIMM to go backwards if this info proves false?

I thought this was common knowledge, but I don’t see proof. I assumed it was true because then it would make sense that SGI might ship 500 MHz flashed replacement Fuel main boards (back in the day) and the field tech would install and then run the system, then just type in the flash command to update it to the final customer clock speed.

Anyone have first hand knowledge of this for PIMM swapping?

Thanks!