I have comprise and encompass 2 sticks of 1GB ram I presently purchased it. They are together 6400 800 MHz 1GB sticks from AMPX. My previous 2 memory sticks were 4200 sticks of 512mb I immediately tried to position my 6400's in and my screen would not work and would stay blank. I have comprise an Intel Pentium D CPU 2.66Ghz. I was told that 6400 would run (immediately not to its full potential). Is this due to compatibility tribulations.
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