LoWeN wrote: Hello,
Hummm "bad".
So what can we take as "base" for that kind of mod.
Any R7K sure?
R5200?
Because I never found any R7K here around only R5K/R10K/R12K and one time in my life I have seen 02+.
Kind regards,
Charles
RM5200 are hard to find, and even if you find it, its price will be very high.
chicago-joe wrote: LoWeN Wrote
would an O2 with an R5K@180Mhz be a "good base" for that mod.
The cpu chips on the 180 and 200MHz O2s are V5000 series chips made by NEC and are completely different, swapping a RM7000C chip for a V5000 chip is out of the question. This was my answer to a question Shtoink had earlier on the same subject:
I don't know much about Indys, but the 180 and 200MHz O2s use the NEC v5000 cpu chip. I'll bet the R5000 series Indys use the same series of cpu chips. NEC made a V5000A series chip (pin and command compatable) that maxed out at 266MHz and I have seen these around so they are available. I downloaded the data and use guides for both and the only problems I see are that the 150, 180, 200 cpus use a 3.3V core and IO voltage and the 250 and 266 cpus use a 2.5V core and 3.3V IO voltage and there is not a 2.5 mutiplier for the core speed. I don't know how hard it would be to modify the voltages on the cpu card, if it could be done at all. I don't know what would happen if you ran a 266 chip with 3.3V on the core, it would get HOT so you would have to cool it well and I would think the chip life would be shorter but it might still last quite a while and should be much better in performance. To get around the core speed problem you would have to change the control resistors on the PLL chip (ICS9159-10) to change the Xtal to output ratio to 93/20 (66MHz X cpu mult of 4) to run the chip at 266MHz, this should be easy enough to do. I might try this with an O2 200MHz cpu board, I would think if it works on an O2 board it could be made to work on an Indy cpu board.
[...]
canavan wrote: I think Indys would be a much better candidate for the VR5k upgrade, since at least some of the CPU boards have voltage regulators on them (according to http://www.reputable.com/indytech.html ). There's one visible on http://www.schrotthal.de/sgi/indy/indy_r5000_cpu.jpg In an indy, there should be some glue logic between the 5V and 3.3 V parts, so with some luck, I/O and core voltages are separate already.
My O2 R5k modules don't look like it could be possible to convert them to 2.5V core without some kind of adapter socket.
chicago-joe wrote: I don't know much about Indys, but the 180 and 200MHz O2s use the NEC v5000 cpu chip. I'll bet the R5000 series Indys use the same series of cpu chips. NEC made a V5000A series chip (pin and command compatable) that maxed out at 266MHz and I have seen these around so they are available. I downloaded the data and use guides for both and the only problems I see are that the 150, 180, 200 cpus use a 3.3V core and IO voltage and the 250 and 266 cpus use a 2.5V core and 3.3V IO voltage and there is not a 2.5 mutiplier for the core speed. I don't know how hard it would be to modify the voltages on the cpu card, if it could be done at all. I don't know what would happen if you ran a 266 chip with 3.3V on the core, it would get HOT so you would have to cool it well and I would think the chip life would be shorter but it might still last quite a while and should be much better in performance. To get around the core speed problem you would have to change the control resistors on the PLL chip (ICS9159-10) to change the Xtal to output ratio to 93/20 (66MHz X cpu mult of 4) to run the chip at 266MHz, this should be easy enough to do. I might try this with an O2 200MHz cpu board, I would think if it works on an O2 board it could be made to work on an Indy cpu board.Joe
chicago-joe wrote: I don't know much about Indys, but the 180 and 200MHz O2s use the NEC v5000 cpu chip. I'll bet the R5000 series Indys use the same series of cpu chips. NEC made a V5000A series chip (pin and command compatable) that maxed out at 266MHz and I have seen these around so they are available. I downloaded the data and use guides for both and the only problems I see are that the 150, 180, 200 cpus use a 3.3V core and IO voltage and the 250 and 266 cpus use a 2.5V core and 3.3V IO
[...]
Stonent wrote: Ok after reading the O2 overclocking guide, I see that the Indy R5k module has J1 - J5 on the side. Could these have a similar function to the resistor matrix on the O2?
http://132.180.68.114/~gemm/images/o2/i ... _modul.jpg
So... I am assuming the actual socketed chip is the same among the Indy and O2 right?
Voltages will be the smallest problem, as opposed to packaging - O2 and Indy use PGA CPUs, the VR5000A is available as BGA only, with a different package size (29mm edge length vs 47mm) and different pin count.
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