[rescue] 480Mhz Cpu's in an Ultra 2 Chasis? Can it be done?
skeezics at q7.com
Sat Feb 17 05:11:42 CST 2007
On Thu, 15 Feb 2007, Mark Brown wrote:
> On my Ultra-2 (Dual 300's) - can I replace these with 480mhz cpu's from
> an E450?
As others have mentioned, that's almost certainly not going to work for a
number of reasons.
I've never understood, however, why nobody has tried those in a 220R or
420R - those ought to have the cooling and power to support the 480Mhz
modules, whereas perhaps the desktop versions (U60 and U60) may not...
In the 220/420R, the 360Mhz modules run at a 3:1 clock multiplier and the
bus runs at 120Mhz. The 450Mhz modules run at 4:1 - with a 112.5Mhz bus.
Why didn't they drop in the 480? Yield? Heat? Power requirements?
Physical size of the modules? PROM issues?
If you actually have some of the (rare/expensive) 480Mhz US-II parts and
are feeling frisky, I'd scrounge up a 420R and try that. But don't blame
me if the thing bursts into flames! :-) I'd be very curious to know if
anyone has successfully done that, though. It seems a perfect match.
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