I think we need a little more info.

the Specs of the motherboard should tell you if its a AMD/Intel or what type of one of those it supports up to.

for example:
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2823998&sku=I69-2146

 Motherboards > Socket 775 > Intel Chipsets > 945G
 
 
Intel D945GCCRL Intel Socket 775 MicroATX Motherboard / Audio / Video / PCI Express / 10/100 Ethernet LAN / USB 2.0 / Serial ATA 2  Users Rated 
 
 
 
 
 
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Item Number: I69-2146
 
Availability: In Stock
 
 
Regular Price: $.00     
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My Price:    $69.99

 
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Intel® Desktop Board D945GCCRL
The Intel® Desktop Board D945GCCRL essential series offers a cost-efficient integrated graphics solution. This board is designed for the Intel® Core™2 Duo, Intel® Pentium® D, Intel® Pentium® 4 and Intel® Celeron® D processors supporting up to 800/533 MHz system bus in the LGA775 package. Other features include PCI Express x16 graphics connector, dual-channel DDR2 533/400 memory, Intel® Graphics Media Accelerator 950, integrated Intel® PRO 10/100 Network Connection, Intel® High Definition Audio and up to eight USB 2.0 ports.




 
 
Specifications
 
   Form Factor:   microATX
 
 
   Processor Interface:   Socket 775
 
 
   Processors Supported:   Intel Pentium 4 LGA775
    Intel Celeron D
    Intel Pentium D
    Intel Core 2 Duo
 
 
 
hope that helps