That's not the only reason. Another reason is they want more people to buy the more expensive high end part. GT200 is very flexible as well. Look at the GT216 (used in GT220) with its ~100mm^2 die size and DX10.1 support.
yeah, very flexible... it only took them 14 months to come up with GT216 after GT200 was launched... thats amazingly flexible!
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