I'm wondering if I can buy a stock x1900XT to replace the 7300GT in a Mac Pro. In the past we've had different firmware versions on discrete video cards to deal with PPC / Intel differences but does anyone know what the situation is today? The 512MB x1900XT is $350 at newegg.com. If I could sell the 7300GT for $60 bucks on eBay, I'd be coming out ahead compared to ordering the BTO option from Apple. BTW, here is the 7300GT at newegg.com.