[rescue] Ultra 5/10 RAM redux
twmaster at twmaster.com
Thu Mar 24 11:06:06 CST 2005
On Thursday, March 24, 2005, at 11:53 AM, Jochen Kunz wrote:
> On Thu, 24 Mar 2005 18:34:14 +0200
> Michael-John Turner <mj at turner.org.za> wrote:
>> What's the cheapest RAM I can use in an Ultra 5? Can I use any 3.3V
>> ECC EDO DIMMs or are there gotchas I should be aware of?
> I use generic registered 3.3V ECC EDO DIMMs in my U5 and U10 taken from
> PPC machines.
Right same stuff.
>> In particular, I'm worried about the U5 possibly only seeing half the
>> RAM on a DIMM, etc
> IIRC there is something with 10 / 11 bit RAS / CAS / column mode.
> I observed that some DIMMs are seen only with half the capacity.
> Unfortunately I have no recipe to sort out such problematic DIMMs. It
> depends on the capacity and organisation of the chips on the DIMMs. So
> you will need some knowledge about the U5 / U10 memory controller and
> data sheets of the RAM chips in question to sort things out.
10 column = U5/10/(AX I think)
11 column = AXi
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