found this quote
"Apacer Technologies can be pretty well described as a well known name in the eyes of PC hardware enthusiasts. Maybe Apacer isn't as well known in western countries, where the current memory market is dominated by names such as Crucial, Mushkin and the like. But in other countries such as Malaysia, Singapore and many others, the name Apacer is synonymous with good, reliable and memory with amazing performance while maintaining a reasonable pricing. Based in Taiwan, Apacer produces memory from a multitude of different types and names of memory chips, including NEC and Infineon memory chips, as well as SIMMs, RIMMs, SODIMMs and of course, DIMMs. "
from
http://www.8ballshardware.com/articles/apacer256mb/page1.cfm
it seems to be pretty good ram
what to really look out for, is to make sure both sticks can run at cas2 (if either one of your current sticks can run at it though)
what is the problem you are having at the moment with the ram?