One advantage of a modular PC is that fixing a broken one can be much cheaper if you can pinpoint which component is broken.<p>It also helps a lot if the performance and requirements change at different speeds for different components. For a gaming PC you&#x27;ll upgrade the GPU more often than you actually need to upgrade the CPU and the rest of the system. My 4 year old CPU is still fast enough (i2500k), but I upgraded the GPU in the meantime and added an SSD.<p>Reusing old parts can be pretty cheap, but probably doesn&#x27;t make all that much sense if you need parts that aren&#x27;t in common use anymore like the DDR2 in your case.