Phenom X4 vs i7-975

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This is a purely academic question as a) I already have a quad-core Phenom II, and b) there is no way I could afford an i7-975. However, this question has been on my mind for some time. What exactly makes a quad-core, 3.3 GHz i7-975 five times better than a quad-core, 3.4 GHz Phenom II X4?
• Both are quad-core, both are 64-bit, both are manufactured on a 45nm process.
• The AMD is clocked fractionally higher.
• The AMD draws fractionally less power.
• The AMD has twice as much L2 cache, though only 3/4 the L3 cache.
• The Intel has hyper threading, which the AMD does not.
• The AMD costs less than $200, while the Intel costs just under$1,000.

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Quote:
 Original post by FiddlerWait, when does hyperthreading result in a 2x performance increase?.
You could probably construct an artificial benchmark where every single instruction is a cache-miss, where hyperthreading might allow 2x as many instructions to be in flight at once... Not in real code though ;)

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why don't you just by i7 920? you can overclock it with ease.

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