Message-ID: <3A970AD1.A5DBC1C0@airmail.net> Date: Fri, 23 Feb 2001 19:13:53 -0600 From: Chris Parman <cparman@airmail.net> Subject: Re: [suse-sparc] Overclocking Sun Ultra 30 workstation
Hello,
I have a Ultra-30 as well, I'd be interested in knowing
who to "Overclock" too :)
-Chris
KirkE@paccessglobal.com wrote:
>
> Greetings all,
>
> I just obtained an Ultra 30 model 300 workstation (2 18.2 GB IBM
> after-market UltraSCSI) and have begun meddling with the black art of
> overclocking an UltraSPARC.
>
> I have located documentation at docs.sun.com for the jumper settings and
> have discovered two important and probably noteworthy clues:
>
> The UIIi 300MHz mbus processor module and the 360MHz mbus processor modules
> no dot appear to have any hard-coded or pin-bonded frequency, which should
> theoretically mean they can be overclocked assuming I can either determine
> which pins represent the UPA to CPU clock divisor and (conversely) what
> jumpers on the motherboard correspond to the UPA frequency (and ultimately
> the divisor between UPA and PCI bus A and B).
>
> Supposedly, with the latest OpenBoot 3.27.0, the Ultra30 can support 400 and
> 450MHz processors with up to 4MB of Ecache. Given the cost of a 400Mhz
> processor (some $2000.00 to $2300.00), this is probably the only econonical
> way to get more performance (particularly from systems like these that can
> be had for $900.00 and down). If this is true, at least a few 300MHz
> processors may be able to reach 360 and 400 MHz, assuming that power
> requirements are not too out of whack between them (and the resulting heat
> increases aren't too severe).
>
> At 100 MHz, the UPA of a model 300 is 1/3 (divisor of 3) the frequency of
> the CPU core. If I can determine if indeed there is a jumper position for
> adjusting the UPA frequency to 120MHz (corresponding to a 360MHz UII module
> using the same divisor), though it will may be necessary to re-adjust the
> UPA to memory bus frequency back down to prevent overclocking the older FPM
> memory beyond 66-75MHz.
>
> If anyone knows what the conveniently "unlisted" jumpers on Ultra 30 are and
> what clock or frequency bits these may set, please send them on. Why should
> the PC geeks have all the fun? : )
>
> I'll inform the group of my progress.
>
> --Kirk Erichsen
This archive was generated by hypermail 2.1.0 : Wed Jun 06 2001 - 11:08:42 PDT