My Silverstone Strider 850W Modular PSU lasts for more than 8 years, earlier than 2008, bought 2nd-hand from Garage Sales, and serve through the following systems:
1) Intel Core2Duo E8400 (3Ghz) | ASUS Maximus Formula (Intel X38 chipset) with 2x Sapphire HD2900XT Crossfire.
2) Intel Core2Duo E8400 (3Ghz) | ASUS Maximus Formula (Intel X38 chipset) with 2x HIS HD4890(1GB) Crossfire.
3) i7-3770k (3.5GHz, Turbo Boost @3.9GHz) processor, ASUS P8Z77-V-DELUXE mainboard and Kingston Hyper-X 2000MHz DDR3 8GB Kit Rams(2GBx4) and a single Military Class III grade/quality MSI R7970 Lightning Twin Frozr IV 3GB graphics card.
The PSU is still going strong without any hiccups.