one mem stik,says ...pc100 ,128megabites,322-620:the otherone says ,pc100,128mb,222-620. are they compatible?

Answer 1

They are both PC100 speed, 128MB memory. Basically the same. (the 2/3 is a reference to referesh CAS timing and CAS difference is not important in 99.9999% of all computers since the BIOS will autosense the timing of memory chips.)

Answer 2

The test question seems to be "do your cas 2 parts operate at cas 2 at 100 megahertz, or only at 66 megahertz?" The fastest cas 2 parts that operate at cas 2 at either 66 MHz or 100 MHz will have a PC100 label on them that says PC100-222-xxx. Cas 2 parts that operate at cas 2 at 66 MHz and cas 3 at 100 MHz will have a PC100 label on them that says PC100-322-xxx. The 222 or 322 refers to the actual data programed into the spd eeprom chip located on the memory module that informs the motherboard exactly what the sdram module is capable of. Anyone with a logic analyzer can measure this.

They are compatible but just a matter of speed. You see it is good to know the speed also too, in case you want to OC (Over Clock).

Answer 3

Yeah,but the slower ram will set the speed of the faster ram to the slower speed. You probably won't notice the difference.

Answer 4

Yep put them in
256mb really is just a basic amount of memory but it's better than 128mb