How to make a configurable option require another configurable option.

[Leyer]

Hey,

So explain it better, I will be using an example.

I sell a hosting package.

I have a configurable option for the amount of dedicated CPU:

1. 25%
2. 50%
3. 75%

I also have a configurable option for the amount of RAM:

1. 1 GB
2. 2 GB
3. 3 GB

I want to make the RAM require a certain CPU percentage. So if the customer orders 3 GB RAM it requires the customer to order at least 50% CPU. But 50% CPU should work with less RAM. So it's only limited one way.

Is this possible? I've played around with the code for the order form, but couldn't make anything work there.