Will it cause any crashes.....bcoz recently i tried to add a 1tb 6gbps hdd (which was used and had windows installed too) with my 160 gb hdd...and after working for sometime bsod was appearing.it will work, but, will indeed rival watching paint dry...
Get the SSD ASAP; I'd recommend Crucial MX500 unless you can find Samsung 860 EVO for similar pricing...which is rare, but, it happens in various sales, etc...