You are limited to these Pentium 4 processors and the highest you can go is the 570 3.8 ghz with hyperthreading. I've been told you can use the 6xx series processors with a bios upgrade. No way a core 2 quad will work!
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Technical Specifications
Dell Dimension 4700 Series Service Manual
Processor
Processor type
Intel� Pentium� 4 processor 520, 530, 540, 550, 560, or 570 with HT Technology
Intel Pentium 4 that runs at 2.8, 3.0, 3.2, 3.4, 3.6, and 3.8 GHz internally and 800 MHz externally
Level 1 (L1) cache
16 KB
Level 2 (L2) cache
1-MB (displayed in system setup) pipelined-burst, eight-way set associative, write-back SRAM