So since I'm in the market for a new PC (and I tried to find some threads in these forums), is there any reason NOT to get the Intel® Core™ 2 Extreme QX6700 2.66GHz vs. the Intel® Core™ 2 Extreme X6800 2.93GHz other than the .27 increase in clock speed?
I know current games don't all take advantage (if any) of the quad cores right now but I'm looking at it more from the standpoint that the OS will take advantage for background processes, etc. as wel as future growth with new games that will leverage the threads available.
The performance deltas on some of the Core2 processors versus the price increases are amazing... Essentially however you are talking about doubling your cores with Kentsfield, and it does wipe the floor with almost anything else running multiple threads - so it's a lot more than a .27 increase in clock speed. Remember that clock speed isn't the important factor anymore - it's cores.
TBH a dual core would do you for now, but depending on how serious an amount of money you want to throw down for your new computer, I'd say go with quad core for future proofing.
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