Hi Helproom Forum MembersI have two PC 133 Mhz (SDRAM) Memory Modules,which I would very much like to use in my agingDell Dimension 550 (PIII).However, the PC is fitted with one module of 128MB of SDRAM which is PC 100Mhz.Is 133Mhz backwards compatible with 100Mhz?Many thanks in advanceRogmur
"Is 133Mhz backwards compatible with 100Mhz?" - Yes, no problem, but they (all the RAM) will work at the slower 100Mhz speed. G
The answer is normally Yes - ButThe problem is more likely to be the way in which the memory is made ie the size of the chips, although not physically but the way the memory is handled.I've bought a number of sticks recently and some worked in old machines and some not - because of their type not speed.If you need to be sure I would suggest Crucial who will supply memory guaranteed to work on the machine.Since you have the modules however I would suggest that you try them. Its very unlikely that you will harm them or the machineGood Luck
Thanks all, will give it a go,I am relieved to hear it won't harm my pc.Kind regardsRogmur
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