I bought a Tangent 486 EISA, with a SCSI 386SX Caching Controller (4MB)when the chip first came out. I guess that was around 90-91? It had 8, 4MB SIMM slots, and housed 6 SCSI drives. I continually upgraded that machine until it was absolutely maxed out. I worked in databases, and the EISA SCSI controller allowed this machine to dominate everything, until the PII's came out. So, I suppose I got 5-6 years out of it. I did buy a Sun Sparc 10 WS during this time, but I do not think that should be counted.