"Also i wanted to know if the (please don't yell) reset RC circuit could possibly have an effect "

So you know thats a wrong thing to do ! Then why ask ?

Now for an answer :

With the AT89c51, the worst that can happen is that the code ( at times )may not start as expected.

With the 89c51rd2 you may loose the code altogether or screw up the flash in some other way...

Like to take a chance with a simple RC reset ?

Raghu