Can I upgrade to a triple or quad core in a acer x1200 pc

Do you know the Model number of the Motherboard mate? As im getting googled info that it is a AMD X2 5000+ chip??

Or the above could be one of many X1200 models

Indeed. There are a lot of different X1200 models.

System Information for Windows lists this info for my motherboard:

Property Value
Manufacturer Acer
Model WMCP78M

North Bridge NVIDIA nForce 720a Revision A2
South Bridge NVIDIA ID075C Revision A2

CPU Athlon(tm) Dual Core Processor 4850e
Cpu Socket Socket AM2 (940)

System Slots 1 PCI

Memory Summary
Maximum Capacity 4096 MBytes
Maximum Memory Module Size 32 MBytes
Memory Slots 2
Error Correction None

Warning! Accuracy of DMI data cannot be guaranteed

Thanks for the replies.