I have installed Scientific Linux 6.5 (x86_64) and am most impressed.

One thing is puzzling me: As stock it seems to deliver an sl repository (and sl-security), as well as sl6x and sl6x-security. As far as I can see, sl has exactly the same packages as sl6x, and ditto for security.

What's the difference? Do I need both pairs, or can I disable one pair?

Thanks.