CSik:
The main reason you might want to use RUb versus IUB is that IUB uses the 16km visability mod versus RUb using the 8km visability mod. The 16km visability mod may be far more realistic, but it is almost twice the drag on your video card as the 8km visability mod (this is why the original game is only 8km visability).
Once you upgrade to a more powerful ATI video card (not nVida because SH3 does not like nVida drivers), you can then try the 16km visabilty mod without the black objects on the horizon.
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