If it works, I believe your 133 will "clock down". What OS? I don't think you'll see a difference between 256 and 512 on 9x or Me. XP....slight.
Your choice!
~Tom
i have a motherboard that supports both pc 133+ pc 100
memory....the question is can you use both types together....i have 256 mb of pc 133 and i have another stick of pc 100...any help would be appreciated...myk

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic