Quote from: Bombadil on May 27, 2014, 09:22:23 PM

Quote from: nomad1109 on May 27, 2014, 08:23:44 PM

Quote from: djm34 on May 27, 2014, 05:57:35 PM

actually, I am thinking to unlock the tdp.
With the core clock at max overclock, there are clear sign of throttling (the tdp usage ramps up to 118% then go back to 60% and so on... as well as the core clock...)

I did set my TDP to 65, but it just doesn't help, there is something else in there that keeps it from performing as expected.

Still pegged at Voltage limits as the reason, but it is a lower percentage of what the top level thinks it should be.

I think it has to do with there being no Pstate 2 (Custom) on the 750ti for whatever reason. Only state 0 and 8.

I am not an expert enough to just go into KBT and start changing numbers with confidence, but that is how I edited the TDP.

Have any thoughts on if the BIOS from one of my MSI cards (TF model) will work on the other (OC model)? Everything reports exactly the same in GPUZ except the model of memory, but I haven't been brave enough to try it. There is a different version on each model, but the TF just runs faster and OC's better.... not sure.

Are you guys talking about this?:

To me this just seems to be the effect of the different algo's. When I'm mining plain groestl or keccak I'm not seeing this, mining JPC it gets a bit more spikey, but at X11, which has 11 different algo's (lol) which each have a different impact on the power usage, it gets the worst. So that may explain those lines.

Sure this is linked to the algo but also on how nvidia cards are working.
I don't see this behavior on my 780ti for which tdp% core clock are set differently and both power and core clock are very stable.
Here at some point in the processing of the algo, the card requires higher tdp to sustain a given clock frequency, when it tries to increase the power (voltage or current), it goes beyond its 100%. The card mechanism changes voltage/intensity to put back the power below its limit (if you watch core clock frequency this one also change). Once it is well below the limit, it adjust the core clock back to the value which was set initially and the whole process repeats indefinitely.

So yes, it is somehow link to the algo but this is due to an upper TPD limit which is set to low to sustain the core clock at which it is set to run.
So my idea is to unlock the tdp and allow a higher tdp% so it won't throttle anymore. The card should me more stable and allow running at constant core clock (meaning faster too...) I don't think this will increase by a lot the tdp as the spike are just an effect of the throttling but that should stabilise the way the card run and consequently allow the card to run faster (however no miracle here... I am just speaking about having a stable overclock...)