Never had to , to get the warranty honored. If it dies you just set up a RMA and wait the 2+ weeks to get the replacement. Never once have I been asked for proof of receipt or proof of purchase date.
you can go here
link
and start your free account. That will fast track any RMA problems.
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AMD phenom II 1090T @ 4.23 Ghz custom water cooled
Asrock 890 FX deluxe 3 mother board
4 GB DDR 3 1600 @ 1688 Mhz 7 7 7 24 T1 2688 Mhz NB
2x 1 TB WD Sata III 64 mb cache HDD,s raid 0
2x 5870 HD @ 1015/1300 Asus reference
Dual OS win 7 x64 ultimate & win 7 x32 Ultimate (bench os)