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NVIDIA GTX 1080 Ti Owner's Club - Page 490

post #4891 of 10786
Hmm, ok I started to OC and I noticed after just a start (+50 core +350 memory) and + 100 V and PL the core clock is jumping in Heaven like crazy, 2012, 1969, 1975, 2000. lol.

Temps are great. 65C was max in Heaven I had on 1440p Extreme.

But why are those clocks jumping like that.... ?
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post #4892 of 10786
Quote:
Originally Posted by joder View Post

I never would have really given this CPU much attention without your endorsement. It really seems to be a beast due the the eDRAM being available when using a GPU and good overclock-ability. You would think they would have gimped it by locking the multiplier or something.
believe me, i was just as much in denial and shock when I discovered it (thanks WCCFTECH comment section) as anybody. I couldn't believe it either. They couldn't lock it because they had already been promising this cpu for a long time, but they DID call in a "-c" so most of the world would THINK it's locked.
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post #4893 of 10786
Quote:
Originally Posted by mshagg View Post

Again, thanks for your efforts in running these tests (so we dont have to lol). The only question I'd raise is whether furmark is the ideal method of testing. Given it is designed to maximise power draw, it would still hit TDP limits on the Strix BIOS and thus downclock... and, knowing what Pascal is like, no doubt overshoots the downclock, thus resulting in the 'low' power draw measurements.

I guess what im suggesting is, Furmark would only really prove the point if its power draw landed between 300W and 330W (which seems unlikely).

My own theory is that the different VRM configurations mean some extra load is being placed on the FE VRMs that pull power from motherboard voltage rail (whereas the Strix VRM configuration would be designed to pull the extra power from the 8+8 PCIE). Given the BIOS has 'sub limits' placed on each of the three power sources, it's likely to run up against the individual limit for the motherboard power source and trip the TDP limit power flag.

I guess the only way to test the hypothesis would be to apply the mod to the shunt which monitors power draw from the motherboard and leave the other two alone, whilst running the strix bios on an FE.

That's I nice theory but I think it's a combination of software and hardware and possibly just hardware only.

Something reads the 3 resistors measurements and has the card cut drawing power. We need to find what part in the software level to changes the values and math of how the software reads the resistors.

Flashing the bios did not do the trick. Something in the FE still reads the resistors and limits power draw. I'm not sure if modifying the bios is enough.

Shunt mod is a hardware level modification that changes the resistor values read and doesn't limit the power draw at 300W.
post #4894 of 10786
Quote:
Originally Posted by Benny89 View Post

Hmm, ok I started to OC and I noticed after just a start (+50 core +350 memory) and + 100 V and PL the core clock is jumping in Heaven like crazy, 2012, 1969, 1975, 2000. lol.

Temps are great. 65C was max in Heaven I had on 1440p Extreme.

But why are those clocks jumping like that.... ?

What happens 10 minutes in? Still jumping around? Is voltage also jumping around?
post #4895 of 10786
Quote:
Originally Posted by Benny89 View Post

Hmm, ok I started to OC and I noticed after just a start (+50 core +350 memory) and + 100 V and PL the core clock is jumping in Heaven like crazy, 2012, 1969, 1975, 2000. lol.

Temps are great. 65C was max in Heaven I had on 1440p Extreme.

But why are those clocks jumping like that.... ?

I noticed the same thing in benchmarks, it's like looking at a saw tooth. In gaming it holds a lot more steady so I haven't bothered to look into it further.
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post #4896 of 10786
Quote:
Originally Posted by SlimJ87D View Post

That's I nice theory but I think it's a combination of software and hardware and possibly just hardware only.

Something reads the 3 resistors measurements and has the card cut drawing power. We need to find what part in the software level to changes the values and math of how the software reads the resistors.

Flashing the bios did not do the trick. Something in the FE still reads the resistors and limits power draw. I'm not sure if modifying the bios is enough.

Shunt mod is a hardware level modification that changes the resistor values read and doesn't limit the power draw at 300W.

A few pages back we looked at the PCBs for the various cards (that we have info on at the moment). It was confirmed the Gigabyte card had different resistors for the shunts but I believe the others used the same 5 mOhm. However, Exilon pointed out the measurement IC can also be programmed, which may well indeed support your theory:
Quote:
Originally Posted by Exilon View Post

Good catch. The Gigabyte board looks like it uses 2 mOhm resistors instead of the 5 mOhm like the others.

The FE uses this measurement IC
http://www.ti.com/product/INA3221

It can be programmed by the firmware to trigger alerts based on the voltage drop sensed on the shunt. So therefore the the board firmware has to match the actual board or the power measurements will go off the rails.

It makes sense that the Gigabyte firmware doesn't work on FE. The GPU thinks there's a power fault since power draw is 40% of the expected.

All interesting nonetheless!
Quote:
Originally Posted by Benny89 View Post

Hmm, ok I started to OC and I noticed after just a start (+50 core +350 memory) and + 100 V and PL the core clock is jumping in Heaven like crazy, 2012, 1969, 1975, 2000. lol.

Temps are great. 65C was max in Heaven I had on 1440p Extreme.

But why are those clocks jumping like that.... ?

This is GPU Boost doing its thing, and the power limit (which we've been trying to get around with the cross flashing of BIOSes) is forcing the card to downclock.

Your best bet is to start tweaking the voltage curve. For example, you could probably bump that 1975mhz bin to 2000Mhz, which means when the power limit kicks in, that's what it down clocks to.
Edited by mshagg - 4/11/17 at 3:44pm
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post #4897 of 10786
Quote:
Originally Posted by SlimJ87D View Post

What happens 10 minutes in? Still jumping around? Is voltage also jumping around?

Hmm, strange. I gave it +75 on core and +400 on memory (still 100% V and PL) and it boosted to 2050 and then went down to 2038 and stayed 2038 whole time till the Benchmark end (04:09 min).

Hmmm.... Ok, will try to kick it more.
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post #4898 of 10786
Quote:
Originally Posted by SlimJ87D View Post

If I can sell my 4790K for $300 I'd love to get one, but its selling for $250 right now.

Finding a used 5775C would be the key!
honestly, it's a wortyy upgrade at $100 as well. I even gifted my 4790k and I don't regret it at a $350 upgrade. It's worth that.
Quote:
Originally Posted by Benny89 View Post

Hmm, strange. I gave it +75 on core and +400 on memory (still 100% V and PL) and it boosted to 2050 and then went down to 2038 and stayed 2038 whole time till the Benchmark end (04:09 min).

Hmmm.... Ok, will try to kick it more.
ctrl+f to open curve. ctrl+L to lock it at 1.05v. see if it can hold 2050 at that voltage.
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post #4899 of 10786
Playing with curve more. So far managed to get Heaven run stable at 1.081 V at 2075 Core and +450 memory. Will try to get little more. 69C max temp. ROG cooler is really darn good.
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post #4900 of 10786
Quote:
Originally Posted by Benny89 View Post

Hmm, strange. I gave it +75 on core and +400 on memory (still 100% V and PL) and it boosted to 2050 and then went down to 2038 and stayed 2038 whole time till the Benchmark end (04:09 min).

Hmmm.... Ok, will try to kick it more.
Quote:
Originally Posted by Somasonic View Post

I noticed the same thing in benchmarks, it's like looking at a saw tooth. In gaming it holds a lot more steady so I haven't bothered to look into it further.
Quote:
Originally Posted by Benny89 View Post

Hmm, ok I started to OC and I noticed after just a start (+50 core +350 memory) and + 100 V and PL the core clock is jumping in Heaven like crazy, 2012, 1969, 1975, 2000. lol.

Temps are great. 65C was max in Heaven I had on 1440p Extreme.

But why are those clocks jumping like that.... ?

TDP Throttling.
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