Signs of Gpu memory overclock instability

[gilang01]

What are the signs of vram overclocking instability? I heard that the symptoms are quite different from core overclock instability.

[Lotus]

Black textures is usually the big one.

[gilang01]

Black textures is usually the big one.

Is flickering green dots also something to look out for?

[Bananasplit_00]

Is flickering green dots also something to look out for?

probably

[Shakaza]

Artifacting is common with unstable memory overclocks. If I go over around 800 MHz on the memory of my Radeon HD 6670, I start to see red fuzzy things all over the screen when gaming.

[Shakaza]

Is flickering green dots also something to look out for?

Huh, funny. With an AMD graphics card, I get red dots, and you get green with an NVIDIA one. And, yes, that does sound like memory instability.

[IMPERIUS]

basically anything weird happening that wasn't happening before your overclock

[DerProf]

The drivers should fail too.

[Robin88]

Flashing of various colours, usually red, black or green, and usually square, dots or diamond in shape, you'll sometimes get static across portions of or over the entire screen, and reduced performance is another effect and even driver crashes, complete system hangs, blue screens or CTD's in more rare cases, and there may be other artifacts that I can't remember right now.

And even more annoying, some games will run rock solid with huge memory overclocks but then others will crash with barely a 50MHz overclock on the memory, it's a total crapshoot tbh, and most games don't benefit from an increase in memory speed by any meaningful amount, usually less than 5% for a 15-20% RAM speed increase

I've even seen artifacting on stock clock GPU's with excellent cooling, so again, it's a total crapshoot and you may not always win the silicon lottery.

With GPU core overclocking, you'll see flashing textures sometimes, freezes, CTD's and bluescreens and driver crashes much more often, you'll also see flashing of various colours and shapes, more often than not they're usually a blue or red colour and most often are a dot or series of dots, and a sudden drop in performance is observed with very high core clocks above a certain point.

Games tend to be more forgiving with GPU core overclocks though, and most will run just fine with even very large overclocks and most games will get about 1% performance increase in performance for every 2% increase in core clock speed, not always the case though, and some games have been known to show even greater than a one to one performance increase with every increase of clock speed.