Can Intel cpu D805 work on a Dell C2291 mb w/ Intel chipset 865PE?

Hi,

I have a 2004 Dell Inspiron XPS laptop with a Intel Northwood 3.4GHz cpu (512mb cache), 800mhz FSB on a Dell P/N C2291 motherboard using an Intel 865PE chipset. (CN-0C2291-12961-47M-3893 Rev. A03) I read rumors that the chipset has a bios upgrade that can support a dual-core cpu, namely the Intel D805 2.66GHz. Does anyone know if this is true?

I haven't found any info on the actual manufacturer of the C2291. There is some confusion as to whether this is a socket 775 or 475. Manual doesn't say, only gives the chipset info.One site suggested a few alternate cpus for the 865PE, including dual-core. Cannot find any significant info on older Inspiron XPS, only reviews in 2K4. Everything's geared for current version of XPS Gen 2+.

My obvious goal is to see if I can upgrade to a dual core cpu using the motherboard I already have.

Thanks,
There is a 2.0GHz Intel Core DUO T2500 667MHz 2MB Socket-478 BX80539T2500. However, I do not know if the chipset would support it. The CPU runs about $200 to $300. There's also a BX80537T7600 Processor ( mobile ) - 1 x Intel Core 2 Duo T7600 / 2.33 GHz ( 667 MHz ) 478-pin for about $600 - $800.

Any idea if either of these models could work with the Intel 865PE chipset?

David