RX480 not reaching boost clock

[Brent_11]

A rather odd situation this one. When I first got my saphire nitro+ rx480 4gb, it was hitting 1306 Mhz every time I was ingame and staying there, which is step 7 in wattman. Then yesterday I installed the new drivers, and afterwards games felt really sluggish and I checked and saw that it was only getting up to 700Mhz.

Strange. So I thought it must be the new drivers fault, so I uninstalled and installed the old drivers but it stayed exactly the same at 700mhz under load. Thinking it was pointless to try, as I was now convinced it's a hardware issue that's coincidental with the driver change, I then did a system restore to 5 days ago and suddenly it's boosting to ~1200Mhz, jumping around between 1150 and 1250. I tried increasing the power limit in wattman to +20% but it didn't help.

So a really odd situation where I don't know if I have a software or hardware issue. The only other thing I did yesterday that might have something to do with it, is I installed Radeon Pro, and was messing around with vsync settings for a game, but didn't do any OC'ing or anything. I've since uninstalled RPro.

Any ideas what I can do to try get it back to 1306Mhz?

 

[scuzzycard]

Make sure you have dynamic power management off. The combination of power management and vsync will lead to low clocks.

 

[Brent_11]

where do I find dynamic power management please? btw I've been testing the boost clock using furmark without vsync so if it only helps with vsync situations then I guess it's unlikely to help.

 

[scuzzycard]

You're not going to hit max boost in Furmark. Furmark causes any modern GPU to hit its wattage limit at very low clocks, causing it to throttle. What clocks do you hit in Unigine Heaven?

 

[Brent_11]

ah there we go, hitting 1306 in unigine. Very odd that the new drivers screwed things up. Thanks for your help! 🙂

 

[scuzzycard]

Your welcome