I defiantly see a huge difference from HDD. But so what I need is a mobo with a sata III port to get full performance??
Yes, you will need to replace the motherboard. And to get the most performance out of a SATA III SSD, is the best to plug in the SATA III port from the Intel Chipset.
There is another solution, if you have an available PCIE x1 slot on your motherboard, you can get something like this:http://www.amazon.com/Crest-Port-SATA-PCI-Express-SY-PEX40039/dp/B005B0A6ZS
However, you would probably get like 300MB/s writes and reads for the SSD.