as posted in Toms Hardward forums
"Hello, i purchased a Sapphire R7 265 from new egg recently and havent' been able to get it to run properly. i've tried the most recent stable and beta drivers from AMD, but the computer keeps crashing, getting black screen, striping, etc. i can't even run the windows experience index test. it seems like Flash/gaming will cause the computer to crash. with the stock windows drivers i run fine (in 2D i'm guessing) but with the catalyst drivers its a no go. even if i just let the computer sit, the refresh/redraw rate on the screen takes a huge hit, where if i'm dragging windows across the screen, i can't tell what i'm doing
my setup is as follows
Sapphire R7 265
Gigabyte GA-H77N-WIFI LGA 1155 motherboard
Rosewill green series RG630-S12 630w continuous power supply
2 WD drives in RAID 0
i feel like maybe its my power supply, but how do you test that without me RMAing it?"