I have 786MB Ram, a 2.0GHz P4 and the cruddy Intel integrated graphics at 64MB.
From the system requirements for
The Sims 2 Seasons:
NOTE: If you have a non-T&L capable video card, such as Intel Extreme Graphics, then you need at least a 2.4 GHz processor.I suggest you read the Read Me file that is installed with every expansion. It is full of useful information about the hardware you need to run the game. The more recent expansions have steeper requirements than the base game and Uni.