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Re: PMC RM7000C-600T CPUs on ebay

Posted: Fri Aug 08, 2008 3:50 pm
by Dr. Dave
So far as I know, all O2 mainboards will work with all CPU modules - the only real distinction is making sure your PROM is flashed to something recent. If it isn't, stuff a 180 in, boot, flash, swap, and bob's yer' uncle.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Fri Aug 08, 2008 3:55 pm
by nekonoko
Richtom1 wrote: IIRC I have an O2 400 R1200 and a 300 R5000 (not a R5200)


If it's 300MHz, it's a RM5271 - there's no such thing as a R5000@300MHz. The O2 (and IRIX) will report it as a R5000, but that's just because it doesn't know any better ;)

Re: PMC RM7000C-600T CPUs on ebay

Posted: Fri Aug 08, 2008 4:51 pm
by deBug
Richtom1 wrote:
LOL, I think there were two lots of them... :twisted:

correction: selling the 500 MHz version in singles now

eBay: RM7000B-500T



Looks like they're over in ALtamonte Springs ( a couple hours east of me)

What O2 mainboard would these be compatible with? IIRC I have an O2 400 R1200 and a 300 R5000 (not a R5200)

Richard

If you have a 400MHz R12k then use it, its faster than the 600MHz R5200
As far as I know there isnt any 300MHz R5000
R5200 i incorrectly detected by hinv as R5000 so your 300Mhz is probably a R5200

Re: PMC RM7000C-600T CPUs on ebay

Posted: Tue Sep 16, 2008 12:36 pm
by edefault
Hi there,

two more 600MHz CPU modules run 24/7 without heat sink below 37°C here...
... impatiently waiting for O2 owners willing to swap a RM5271 CPU module.

PM me if interested - there are 15 bare CPUs / SPROMs on stock again ;-)

Cheers

Re: PMC RM7000C-600T CPUs on ebay

Posted: Wed Oct 07, 2009 6:28 am
by edefault
edefault wrote:PM me if interested - there are 15 bare CPUs[...]


Addendum: all SOLD OUT. No upgrades until someone points me to another batch of RM7000-600T CPUs.
Btw., I´m not going to buy a batch of 665 pcs. from China unless these are far less than a buck per piece :) .

Sorry.

Edit: No use to suggest 7035 and 7065 CPUs - these are not pin (ball :)) compatible with the RM5271.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Wed Oct 07, 2009 3:45 pm
by canavan
Edit: No use to suggest 7035 and 7065 CPUs - these are not pin (ball :)) compatible with the RM5271.
The 7035 should be a perfect match for the rm5231 in the Cobalt Qube. I'll trade you one Qube2 for an upgrade :D

Re: PMC RM7000C-600T CPUs on ebay

Posted: Wed Oct 07, 2009 4:07 pm
by mia
If somebody wants a 600Mhz working module for O2, I have one I could sell, just PM me with the right price.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Wed Oct 07, 2009 4:15 pm
by MisterDNA
mia wrote:If somebody wants a 600Mhz working module for O2, I have one I could sell, just PM me with the right price.


ORLY? I wonder how your asking price compares to Ian's? This is tempting.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Wed Oct 07, 2009 11:43 pm
by edefault
It seems I was again too fast on the trigger ...
about half a dozen of O2 CPU modules which proved dysfunctional in the past will eventually take part in another attempt to be upgraded to 600MHz.
I´ll possibly get me some more bare CPUs from China or elsewhere where they are available by the hundreds.
For a small quantity of 10 prices vary between 15 and 35 bucks.

The staff at the repair shop told me that if BGA CPUs grow old unsoldered due to oxidation of contacts the soldering process becomes more difficult.
Anyway, it is controlled optically afterwards using x-ray; but one can´t use a bare CPU twice if there were short-cuts detected since reballing is much too expensive.

TBC

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 12:15 am
by hamei
edefault wrote:The staff at the repair shop told me that if BGA CPUs grow old unsoldered due to oxidation of contacts the soldering process becomes more difficult.
Anyway, it is controlled optically afterwards using x-ray; but one can´t use a bare CPU twice if there were short-cuts detected since reballing is much too expensive.

How complex is that board, edefault ? There are hungry people in Guangdong these days. Those boards are a little rare and expensive, plus they are old. Complete new ones might be cheaper and better ? Not that hard to reverse engineer even a six-layer, throw them in a surface grinder and take off .010", photograph, take off another .010" and photograph, etc etc.

900's would be even spiffier tho :D

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 4:17 am
by edefault
Yep, someone to reverse-engineer an O2 module would eventually want to use a more powerful CPU from the PMC MIPS series..
IMO not going to happen, though: there are not enough O2 owners out there willing to buy, say, a decent 1GHz CPU module.
Or are there? I´d gladly donate a module :-)
Another issue: now IRIX is discontinued, with no source code available ... would it be possible to get it running on non-SGI hardware?

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 6:29 am
by MisterDNA
If I could get a bare CPU (or three) and the SPROM plus whatever else, I could try a conversion with one of my modules and work up a profile for the BGA soldering.

I've learned BGA rework over the past two years and have never had a single bridge. Granted, I use a Teradyne Summit 750 for re-flow so that helps a bit. I inspect with a Photon Dynamics x-ray.

I'm learning re-balling now.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 10:47 am
by mapesdhs
MisterDNA wrote:ORLY? I wonder how your asking price compares to Ian's? This is tempting.


I make a loss on my hobbyist pricing. Not managed to tempt any commercial sales yet though.

Ian.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 10:50 am
by mapesdhs
edefault wrote:Yep, someone to reverse-engineer an O2 module would eventually want to use a more powerful CPU from the PMC MIPS series..


Not possible without the O2 PROM source (according to Joe) and SGI told me this will not be released. Unless Rackable
decides otherwise, 600 is it for O2.

Ian.

Re: PMC RM7000C-600T CPUs on ebay

Posted: Thu Oct 08, 2009 10:54 am
by hamei
mapesdhs wrote:I make a loss on my hobbyist pricing.

That's why I was thinking brand new boards would be the way to go. Starting out with a $125 used board then going thru all the hand labour to de-populate it, then solder on another chip, then check and recheck because all the parts were used, that's got to be a lot more work than starting with new components.

The prom data would make this a real winner tho. I myself am kind of iffy at 600 but 900 ... I know, performance is not all about processor speed but still ...