P750DM Prema vBIOS weird issue

Hey guys,

So before I flashed prema's vbios on the 980M i could OC +135 on the core with no issues.

After the flash even with +100 I get a black screen after awhile even after adding some voltage.

Am I missing something here?

Thanks

 

Check with @Prema . the Prema vBIOS voltage might be high for your card.

 

Ah I'll try letting him know perhaps he can send a modded vBIOS.

I have a 75% ASCI so maybe I could make due with less voltage you mean?

 

Have you checked to confirm that +135 on core is the same clock speed as before? Sometimes with vBIOS mods the offset translates to a different clock speed because it is +135 added to a different starting value. For example, adding 135 to 900 equals a lower value than adding 135 to 1000.

 

It is the same clock speed since I checked with the left panel of nvidia inspector.

I feel my card perhaps doesn't get enough voltage? Isn't that what the black screen would usually indicate in a case like this?

 

What is "some" voltage? The voltage slider on Prema's VBIOS is largely unlocked, meaning is goes WAY above what you can actually put into the GPU.

+135mhz should easily be achieved on stock voltage, nevermind overvolting. Even then, I'd expect as little as +27.5mv to be perfectly fine.

Black screen means you're overloading the power delivery/VRMs in most cases. In my case, my 970M black-screens if I go higher than 50mv @ ~1300mhz.

 

I added 25mv and still got a black screen at 135/100..

 

It can also be too much voltage or even more likely getting too hot. The only sensor available is the core sensor. Something else may be getting too hot over time other than the core.

Watch your temps and see when it goes black. I had that problem with 980M as well and it would always go black between 70-75°C when overclocked, but could go to 85°C with no black screens when not overclocked. That means something other than the core is getting too hot. It might be something you can correct by better thermal pads, properly placed pads, improving heat sink fit, etc.

Correct.

 

Yup, I go black at the 70-75 mark but can usually go over that when not overclocked.

Should I just flash back at stock vBIOS at this point then?

 

Out of curiosity, what are you using to test it? Test like Furmark generate significantly more load on your VRMs than most tests. For that matter, the new TimeSpy test also generates a bit more VRM heat than usual (as it's much like the Furmark test as far as draw counts and such).

 

No, please don't use Furmark. It can kill GPUs. Just use something like Heaven or a 3DMark benchmark. Since it is going black around the same temps you have a VRM, MOSFET or phase driver that is getting too hot when overclocked and overvolted. You may even have a bad or weak MOSFET.

 

With stock vBIOS your card never really used the extra 135Mhz as it already throttles even on stock clocks.

Now you will see higher actual performance on stock clocks than you had with 135Mhz+ before.
So it's like comparing apples to oranges.

 

So it's as if I'm adding on top of the 135Mhz everytime I adjust the slider?

 

With the Mod it'll use the actual voltage and clocks you set.
With the stock vBIOS it'll only run the speed for a very short time and then reduce it.
So now you have to find the cards actual optimal settings.
A black screen is an indication of overheating MOSFETs.
Make sure that the thermal pads make proper contact with all of them.

Try something like 100Mhz+ with stock voltage and see if it's stable.

 

Weird thing about the BGA AW17 with 970M is that I throttle instead of blackscreen (+200mv, stock dell thermal pads)

If I turn down the OV then it'll sustain a high load for extended period of time, if not, I will most likely throttle under firestrike ultra stress test or heaven with max tessellation looking at the dragon statue

 

That's probably some of their highly distinguished magical BIOS/EC cancer that is gimping power caps rather than the GPU and associated components.

 

azor's fairy dust

Spoiler

it's his dandruff

 

Probably to protect low quality components!!