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I went to a local pc store and the tech guy was very nice and tomorrow hes coming to my house with a 2700 DDR Sdram Kingston stick to see if it works well...

we both think that the faster ram will slowdown to work at the same speed that the slower 21000, so I can mix both of them without problem, but I found this disclaimer on the kingston website

PC2100 models will support PC2700 parts (KTA-G4333) if original DDR266 memory is removed first.

http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?id=1&SysID=12306&mfr=Apple&model=Power+Mac+G4+Dual+Optical+867MHz+%28Mirrored+Drive+Doors%29&root=latam&LinkBack=http%3A%2F%2Fwww.kingston.com%2FLatAm&Sys=12306-Apple-Power+Mac+G4+Dual+Optical+867MHz+%28Mirrored+Drive+Doors%29&distributor=0&submit1=Buscar

So anybody has mixed different speed ram on their computers.. ?
 
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