http://www.ultimatebootcd.com/download.html
get it burn it in nero, burn image from recorder not burn the file
when ISO linux loads just hit enter, under mb tools you will see memtest86....run it overnight....
Make sure you set the right voltage, for the plat rev 1 its 2.2 i think....All ram will get the same voltage....so go with whatever is the lowest of the 2.....
I currently run the plat rev 1(2x1gig) and cheap rendition(667 rated at 1.8 volts 5,5,5,15) stuff together. It all runs 667 4,4,4,10 with 2 volts(would run 1.9 for just the rendition, but i needed an extra 0.1 volts for 4 sticks....so you may need this too)
99.9999991% sure it(yours) will all do 4,4,412 with no problems...