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Dude Galaxy R has Tegra 2 and not Tegra 3.
There's no problem in Tegra 2 and it should run ICS smoothly as its more than capable. But the delay is from Samsung's side as they are going slow on updating all their devices to ICS.
Galaxy R will get ICS but you'll have to wait for it a bit.
One more thing buddy don't create new threads as there's already one thread on this topic and you can post your queries in that thread.
And check out the Newbie thread it'll clear most of your doubts, but if still have any post it in that thread I'll try to answer them.
Here's the link: http://forum.xda-developers.com/show....php?t=1525109