Originally Posted by zodac
PPD-wise, Dual GT 430s.
Power-wise, GTS 450.
Upgradability-wise, GTS 450.
If you don't plan on CPU Folding, any dual core would be enough. Otherwise, any quad.
Actually, it's more like:
PPD - GTS450 (Outperforms two GT430s)
Power - 2 GT430s (49w TDP ea vs 106w TDP of GTS450 - Stock settings)
Expandability - GTS450 (Add another one down the line)
Value - GTS450 (Cheaper than two GT430s)
The GT430 gets 3-4k on current WUs (surpassed 8k on 900pt WUs).
The GTS450 gets 7-9k on current WUs (Pulled 13-15k back in the glory days).
I've used every 400 series card save the GTX480 and GTX460 SE... I've been around the block