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Re: XPS 420: RAM Frequency is 667 MHz instead of 800 MHz.

Your problem is mismatched ram. Even though the specs might appear the same any slight difference in the ram sticks will cause the ram to run at the default speed.

 Home Built Sandy Bridge P8P67 i7 2600k @ 4.5 GHz 8gigs GSkill Ripjaws. Corsair 800D Case and AX1200 Ps X-Fi Titanium Fatal1ty pro PCIe Sound Card
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