p4 cpu compatibility

Hi, i was wondering if any of you could tell me if a 2.53 ghz 533mhz fsb p4 cpu is compatible with a sis-645 motherboard which i already have a p4 1.7ghz 400mhz fsb in.Im looking to upgrade but dont have enough money to get both a new cpu and motherboard.

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More about compatibility
  1. Most 645 mobos will support the 2.53 p4, but yours may require a bios flash. Please post your board brand, model number and memory specs. You can also run most 1.8a's at 133 (2400) with little or no increase in voltage. The 1.8a is about $80 cheaper than the 2.53.
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