From: Dan Malek <dan@embeddededge.com>
To: Conn Clark <clark@esteem.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Overclocking the Motorola 860 family
Date: Mon, 13 May 2002 23:43:44 -0400 [thread overview]
Message-ID: <3CE087F0.3040907@embeddededge.com> (raw)
In-Reply-To: 3CE0464A.C94BE21@esteem.com
Conn Clark wrote:
> Has anybody overclocked a MPC860 or a MPC850?
I've tried cranking up the PLLs beyond the chip spec. None of them
have ever worked. I could only get 4 MHz steps, so I tried the 80 MHz
at 84MHz, which didn't work (including all UPM timing changes to ensure
memory was OK). Maybe it would run at 81 or 82 MHz....
> .... Right now we run our 850 at
> 49.1MHz and I want to double it.
No way. I've tried lots of different speed spec parts at higher than
rated values, none has ever worked for me. It appears Motorola has a
pretty good screening process, and when they state 50 MHz it isn't likely
to run beyond that. Even if one appears to work, I wouldn't expect a
product or volume manufacturing to be successful.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-05-14 3:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-13 23:03 Overclocking the Motorola 860 family Conn Clark
2002-05-14 3:43 ` Dan Malek [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-05-14 9:39 John_McRoberts
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