Modifying an O2 to run silently

For discussion of triage and repairs to SGIs as well as general hardware questions
po6labs
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Re: Modifying an O2 to run silently

Post by po6labs » Fri Aug 03, 2018 2:51 am

Thanks so much guys! I'm in contact with Ian right now and he is recommending a drive to me.

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mapesdhs
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Re: Modifying an O2 to run silently

Post by mapesdhs » Fri Aug 03, 2018 8:11 am

For reference, I use the Arctic F8 for the PSU (did this for my own system). I also often replace the fan on R10K/R12K CPU modules with something newer which is thicker and thus makes less noise.

In time btw, once my new CLB repair thing gets going, I intend to be able to properly refurbish PSUs, not just replace the fan. That's for the future though, probably a year away.

Ian.

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gijoe77
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Re: Modifying an O2 to run silently

Post by gijoe77 » Fri Aug 03, 2018 5:58 pm

I put one of these in my o2 and it runs pretty quite https://www.ebay.com/itm/HP-412751-016- ... 2877971743

probably the next best thing to a SSD to be honest, but these do run hot - I didn't have any problems running it in my R12k 400mhz o2, so I doubt anyone would have heat issues

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tomvos
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Re: Modifying an O2 to run silently

Post by tomvos » Sat Aug 04, 2018 4:43 am

gijoe77 wrote:
Thu Aug 02, 2018 7:11 am
I have a SSD in my o2, the problem is the SCSI-to-SATA adapter has spiked in price like crazy recently, I don't know why but I guess there is one person with all the adapters and they are trying to corner the market...

for example currently at $2k, I bought mine for $250
https://www.ebay.com/itm/ACARD-ARS-2160 ... 3823727507
That's insane. But then, I have two of those in my O2 and one in my Fuel. I've to consider this fact if I should ever have to sell my systems.

About the O2 modification: I recommend to measure the temperatures inside and at exhaust before and after the fan replacement. That should give you some confirmation whether the new fans do a sufficient job at cooling the O2.

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gijoe77
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Re: Modifying an O2 to run silently

Post by gijoe77 » Sat Aug 04, 2018 5:23 am

tomvos wrote:
Sat Aug 04, 2018 4:43 am
gijoe77 wrote:
Thu Aug 02, 2018 7:11 am
I have a SSD in my o2, the problem is the SCSI-to-SATA adapter has spiked in price like crazy recently, I don't know why but I guess there is one person with all the adapters and they are trying to corner the market...

for example currently at $2k, I bought mine for $250
https://www.ebay.com/itm/ACARD-ARS-2160 ... 3823727507
That's insane. But then, I have two of those in my O2 and one in my Fuel. I've to consider this fact if I should ever have to sell my systems.

About the O2 modification: I recommend to measure the temperatures inside and at exhaust before and after the fan replacement. That should give you some confirmation whether the new fans do a sufficient job at cooling the O2.
There was a thread about this exact topic on nekochan before it died. I had just put a 400Mhz module in my o2 and monitored it for a few weeks with one of those laser thermometers. It basically topped off at 100F, while scanning the PSU area. I suppose that's the top end benchmark for o2's. If an o2 is running hotter than that there might be some issue that needs to be investigated

sgiseller
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Re: Modifying an O2 to run silently

Post by sgiseller » Thu Aug 09, 2018 12:38 am

unplug it, will be absolutely quiet

JacquesT
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Location: Somerset, UK

Re: Modifying an O2 to run silently

Post by JacquesT » Thu Aug 09, 2018 4:28 am

Your ram will be susceptible to failure at a much higger rate, imho, not a good idea to unplug [the PSU fan]

brackets added in edit. If you unplug the PSU fan the ram simply slowly cook to death.
:Octaneb: 1x 400Mhz R12k, 1Gb, V8, 6.5.30
:O2: 300Mhz R5200, 384Mb, 6.5.22m, FPA with :1600SW: [300Mhz R12k project in the works]

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