I currently have a PII 450 and I am planning to upgrade to AMD 1.2 GHz Athlon in a while. I have 2 strips of PC100 128 MB RAM, which I would very much like to keep on using.
But I am confused about 1.2 GHz Athlon's specs. At the AMD website it said it can only use DDR RAM, but on Alienware's website, the 1.2 GHz Athlon could be configured with PC133 RAM (basically the same as PC100). So what kind of RAM does it use?
The only constraint is the mobo chipset. ie if you have a mobo that only uses SDram and that it can support PC100 and PC133 then you are fine.
If the mobo chipset only supports DDR, which should be the the out-coming new ones then you will need to get DDR ram.
Conclusion, first you choose the CPU, then you choose the mobo that is compatible with your CPU, finally find out what RAM the chipset on your mobo support and done.
Usually you want to make sure everything is the newest and fastest on the 5 most important component in the PC
3 Graphics (for gamers, non gamers can skip this)
4 mobo (deciding factor is chipset)
This list always stick to this decending order, because like everyone else you want the fastest CPU, and then you want the fastest DDR266 with least CAS value. 3rd you find your fastest Graphics and 4 you find a mobo that support all of those, and finally the HDD is the last bottleneck to destroy.
I personally would change to DDR266Mhz, it will be a extra boost your Athlon 1.2G, think of it as a Turbo to your existing 2.0 V6 Quad cam type of car.
Since SDram price drop by 50% and DDR price will come out like SD's price, it's a good deal.
Yes your PC100 ram will work unless you are getting a DDR motherboard. But they are kinda hard to find right now so if you stick with one of the current well-known motherboards like Asus A7V or Abit KT7 then, yes it will work.