Have you run the DPS hardware test? Run it to see if there's a problem with the hardware. If it passes all tests, then you'd have to look at other issues. I'm not sure what you mean when you say flickering picture noise, but the Velocity DVE is good but not great. It can sometimes make fine lines flicker. The fix is to use the bandwidth option in the DVE. Change it from auto to manual and play around with the settings to soften the flickering.
If you hardware fails the hardware tests, I'd recommend pulling the card (Reality, Quattrus, Altitude depending on what you have), cleaning the PCI contacts with contact cleaning solution (can get it at Radio Shack) or with a pencil eraser. Then reseat the boards and make sure they're well seated, the bracket is snugly screwed in, and any supports brackets inside the PC are doing their job.
If you still have the problem..and the noise you're talking about is really noise and not just a limitation of the DVE, then you likely have a defective board or DVE module. You'd have to contact Harris for repair. It used to be $750 for a repair. Or you can look on Ebay for a replacement which you might be able to get for less than $750.
Report back what you find out.
Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com