>>> is there any chance to have PC memory working on Ultra 5/10 ?
>>> I tried to plug an EDO and PC100 part but they don't even fit in the
>>> slot.
>>> 
>>> anyone can confirm Sun Ultra's only can use Sun Memory ?
>> 
>> yip (of course ;).
> 
>> it's proprietary Sun memory.
> 
> Sure about that? The DIMMs in my U1 certainly look odd, but these in the
> U10 look like ECC EDO DIMMs.

for the U5/U10 - as i just mailed, i saw a 'Compaq' stick in an U5...

but i think it's much cheaper to get original U5/10 mem from ebay than to
get a U5/10-fitting PCish EDO stick ;)