[jwhat]

Hi SGI'ers,

I have noticed that on Ian M's SGI Depot that he as an Origin 200 CPU part number for Dual 360MHz for Origin 200:
- Dual-R12K/360MHz (4MB L2) CPU Module for Origin200: 1195 UKP (SGI PN 030-1497-001)

Has anyone very seen this in the wild or have Origin 200 with this CPU configuration running ?

I was just curious as last SGI Origin Pages (via Web Archive), only has 270MHz Option:
- https://web.archive.org/web/200405090840...ssors.html

So was the 360MHz option a very late update that like the Fuel 900MHz was never really marketed as available by SGI.

Thanks for any information.

Cheers from Oz,


jwhat/John.

[vishnu]

I've never seen such a beast myself but the sgistuff website seems to think it should work:

http://www.sgistuff.net/hardware/systems/origin200.html

[jwhat]

Hi Vishnu,

thanks for pointing out that, I was just on that website yesterday but failed to notice the 360, as while faster it come before the 270.

I see it also had that this was R10k not 12K MIPS variant.

According to Wikipedia:

"The R12000 improves upon the R10000 microarchitecture by: inserting an extra pipeline stage to improve clock frequency by resolving a critical path; increasing the number of entries in the branch history table, improving prediction; modifying the instruction queues so they take into account the age of a queued instruction, enabling older instructions to be executed before newer ones if possible."

Cheers from Oz,


jwhat/John

[vishnu]

I noticed that too, the only thing I can think is that with the extra silicon they added to the R12K to provide those new features it prevented them, at least at first, from running it as fast as the R10K top end.