Seems to me that owners of the BFG Geforcefx5900's are not experiencing these issues or less of us are. The one I own hasn't flickered or made noises when moving the mouse wheel at all.
I've tested it on DVI/Analog on my Viewsonic Vx800 18" display as well as my old 19" CRT on analog. Both have no flicker. I've been playing many games and there is no flickering to be seen.
[i7 2600k @4.4ghertz][2x4 GB DDR3 1600][EVGA GTX570 1.280GB SC][EVGA GTX460 physx][Asrock Extreme7 Gen3 Z68][2xSeagate 160 Gb SATA HD raid0][Seagate 250 GB SATA2 HD][Sony Bravia 40' 1080p LCD HDTV][NEC 3520a DVD+-DLw][Windows 7 Ultimate x64][Rosewill 1000w]