Oh man, it's been a LONG time since i've touched based with the X1900GT, but IIRC, you can flash a X1900GT with an X1900XT bios to unlock pipes. However, it was only possible with the Rev.1 card, not the Rev.2 card.
Instead of trying to push it to death, I'd better save it for when it's needed. You never know when will your actual beefy card will need a rest on the RMA department.
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