Why is there tearing on my desktop when OC'ing video card?

I've got a brand new Radeon 5750 in my system. It works great at stock clocks, and performs even better when overclocked. I have been using the ATI Overdrive facility build into the Catalyst drivers to do this. The problem is, whenever I have Overdrive enabled, there is significant tearing on my desktop whenever I move or resize a window. I thought this was caused by the card missing the vsync window when redrawing, but I'm starting to think its something more.

I've tried setting my LCD's to both 60 and 75 Hz refresh, the only 2 resolutions they support. What is really confusing though, is that this happens no matter what clock speeds I pick, as long as Overdrive is on. Even if I select the stock speeds, or underclock the card, this happens. Turning overdrive off resolves this problem.

Drivers are up to date from ATI, Win 7 Pro 64 with Aero enabled. Gigabyte MA785GMT-UD2H mainboard, with the integrated HD4200 disabled. PCI-E is set in BIOS as the primary display adapter.

What is causing this? How (besides turning off Overdrive) do I prevent this artifacting?

Jeff Shattock

Posted 2009-12-09T01:33:48.370

Reputation: 1 798

YOU: Doctor! doctor! it hurts when I do this. DOCTOR: Well, don't do it! – pavium – 2009-12-09T02:34:41.383

Have you enabled Vsync ? – Sathyajith Bhat – 2009-12-09T06:03:14.163

Answers

Well, you are running your card above specifications and having problems! The resolution is easy.

Stephen

Posted 2009-12-09T01:33:48.370

Reputation: 283

2But he says it still does not work at stock speeds, so it's something more. – Isaac Waller – 2009-12-09T05:37:58.317

Overdrive overclocks the card. – Stephen – 2009-12-09T06:23:56.990

1You can also just turn it on without overclocking, or underclock it, which he has done. – Blorgbeard is out – 2009-12-09T07:51:42.367

As Blorgbeard has said, I get these issues simply by turning overdrive on. I can set to the stock clock speeds and its still a problem. – Jeff Shattock – 2009-12-09T16:38:55.957

I recommend RivaTuner instead of Overdrive, although beware it's not for newbies.

Grumpy ol' Bear

Posted 2009-12-09T01:33:48.370

Reputation: 5 313