I have a compaq presario 4505. It came with a pentium 166mmx. I have since upgraded the processor to 233mmx which is the fastest processor the motherboard can handle. Compaq tells me my motherboard is actually a daughterboard? Is there a motherboard i could buy and install in my 4505 that would allow me to upgrade the processor say to 400mhz or so? Thanks in advance for any help.