Well, your friend is incorrect. There isn't any reason you won't be able to install the drives on your current Motherboard. Your board (and mine) doesn't support SATA 3. It does, however, support SATA 2. Essentially, you just won't see the full performance potential of the Intel 520 120GB drive. They'll still function normally.
The standards are SATA 2: 3.0Gbps and SATA 3: 6.0 Gbps. Only the SSD will be able to take advantage of the differences in bandwidth.