System instability for 1.6 GHz models

[simie]

Power Mac G5 uniprocessor firmware update: System instability for 1.6 GHz models after applying the Power Mac G5 5.1.5f1 firmware update.

http://www.macfixit.com/article.php?story=20040916083321619

 

[748s]

my 1.6 became unusable after the firmware update, always freezing after a few minutes. it appears that ram from different manufacturers and/or speeds will not work together after the firmware update. i pulled out the 2 x 128mb's (pc2700) that came with the computer and left the 2 x 512mb's (pc3200). it's working again, no freezeing. if you are buying ram for a 1.6ghz match manufacturers and speed (of ram)