Intel is asking customers to pay extra if they want the full power of their store-bought silicon. An eagle-eyed Engadget reader was surfing the Best Buy shelves when he noticed this $50 card --and sure enough, Intel websites confirm -- that lets you download software to unlock extra threads and cache on the new Pentium G6951 processor. The chip actually have a full 1MB of L3 cache that's enabled plus HyperThreading support.This 'new' idea is similar to online games idea that let you "BUY" extra...