I just found out that ssd's usually die after 2-3 years. Im building a computer with a ssd boot drive. When that fails, can i reinstall my oem copy of windows 7 onto the new ssd? (provided I keep the same mobo)
A SSD is likely to last longer than a hard drive. You should expect 10 years before the nand updates are used up under normal desktop usage.
If you are experiencing 2-3 years, find a different brand.
Intel has 3 and 5 year warranties depending on the model, as does Samsung
You will have no problem with repetitive installs on the same motherboard witha OEM license.