If you ask me, the best processor of the three is the i7 860, performance wise it's faster out of the box than the 920 and uses less power. Win-Win.

Plus the motherboards will cost less. Win-Win-Win.

Even though it doesn't use QPI like nehalem, it moves the PCI controller onto the processor die, so components like videocards talk directly with the CPU instead of going through the northbridge.
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