i just want to make sure its PC133 so i can buy some more to upgrade..... here are ALL the numbers off the RAM M107171A 16*64S133MM16*8133MHZ MIGHTY MM54P16M8AT-75 A2011 73B0127 ITS 128MB AND I WOULD LIKE TO BUY EITHER 256 OR 512 TO PUT IN THE OTHER SLOT AND I HOPE THEY WILL RUN TOGETHER.......FROM THESE NUMBERS IM GUESSING THAT ITS 133 AND THE 16*8 MEANS 16 TIMES 8 = 128 (THERE ARE 8 LITTLE BLOCKS ON THE RAM. does anyone know if to different size RAM's will work together on this? its an AMD. i remember on my old dell i had 64mb of ram and got a 256 chip and they ran together as 320MB. but that was PC100. whats the diffence? i searched google for these part numbers, but could come up with any info. also can you combine pc 100 and pc 133?