So my girlfriend recently got her rig up and running and I'm overclocking her GPU.
So far I've gotten a pretty nice overclock out of it (Even over the stock overclock from EVGA)
My best artifact free settings are:
1495 Mhz Boost w/ 8.114 Ghz VRAM @ 1.212 volts
The card feels like it could go higher, but with some more voltage.
I cracked my fingers, activated overboost and....failed flat on my face.
I'm quite perplexed here.
So here is what happens.
When running the stock settings the card will run the voltage to 1.187
Upping the core speed makes the voltage temporarily jump up to 1.212 when launching heaven(And for the first 30 seconds or so), but it goes back down to 1.187 and also downclocks the core a tad bit.
Adding a 25 mV offset with precision will keep the voltage at 1.212 the whole time, and the card will not downclock at all.
Doing this causes GPU Z to show vRel and VOp as the PerfCap reasons.
Adding more voltage on the offset does NOT increase the voltage.
However, activating OVERBOOST makes things so confusing I hardly know where to begin.
Ok, I turn on overboost and set it to 1.2v just to get started
Running in heaven, GPU z reports 1.187 but precision reads 1.165
The following are the SET voltage, using overboost, followed by the ACTUAL voltage reported by precision (GPU-Z ALWAYS says 1.187, regardless of what precision says)
1.25 | 1.212
1.268 | 1.232
1.3 | 1.232
But those actual voltages are in heaven, idling at the desktop they sit wherever I set them (I.E. if I set it to 1.3, it will sit at 1.3 while idle, but then go DOWN to 1.232 when running heaven)
Weird, but ok 1.232 is still higher than 1.212 so maybe I can get some more headroom? Nope.
In fact, when using overboost I can't get CLOSE to the same overclock as when using the offset. Whenever I have overboost set higher than 1.2 I always crash(Even running with NO OVERCLOCK), but when its set to 1.2 I only actually get 1.165
Furthermore, setting the voltage offset to anything more than +25 causes a lower overclock, even though the displayed voltage does not increase at all
I do plan on Bios modding the card, but want to figure out whats going on with the voltage first haha.
Is the card just hating the higher voltage, or is it something with the BIOS, where a BIOS mod might help things?