What's the hz ratio set to in windows? is it a suitable amount for the monitor you are using? (nearly every monitor is 60hz these days so try that since you said v-sync helps it a bit it might be related to this)
in WaW, after force turning V.Sync on, the lines are still there, but they are frozen in place making them hard to see instead of them flickering. I dont want to have v.sync on though
Dont sound like v-sync tearing to me. That won't present a visible line - just a break/tear in the image. This sounds like GPU defect, and if OCUK confirmed the old one with the same symptoms (was it the same symptoms?) was broke, maybe this one is too? Production line had a bad moment?
If OCuk confirmed the original card was faulty, what are the chances that there is another problem causing an identical problem? I'd say very, very unlikely. It surely must be a bad batch of cards and almost certainly the same faulty component or joint.
I assume you did the following when installing the 460:
1) Connected both power connectors to the 460
2) Disabled the onboard graphics in the BIOS
3) Uninstalled the drivers for the onboard graphics
4) Installed the correct Nvidia drivers
If you have a TV with HDMI try connecting to that and see how it looks.
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