If you want i686 optimized RPM's for your KDE update, check out Texstar's RPMS, here is the link:
There is a KDE3 directory in the above link so DO NOT install those RPMS, those are the BETA release that are optimized for i686. Not to good for a newbie to be messing with.
Everything you will need can be found there. When I performed my upgrade of KDE on MDK 8.1, I used urpmi, nice little tool. I recomend that you install the lib RPMS first, i.e., urpmi lib* and then all the other packages in whatever order you wish. One package that you will need though now that I think of it is xanim which is required for the kdemultimedia package.
BTW........if you use MDK as your primary distro, you may want to bookmark this URL:
This is Texstar's site and he has done some awesome work for MDK users and it's a great resource.