Originally Posted by Laithan The BIOS options for adjusting the +mV 'slider' within a GPU overclock utility are basically:
"0 - 68mV" slider range
"0 - 100mV" slider range (or any custom value between 1 and 100)
(This occurs when the minimum and maximum value on the 2nd slider
is the same).
3) I thought that but after re-reading Zoson post, eh says "When equal to 1, slider shows +100, but only increases minimum voltage while under PerfCap such as Util. This is why the voltage slider seems to do nothing.". So it does
something and that something is the min voltage but it's not clear under which conditions: any PerfCap or just Util (=idle) ?
4) Not tested but may be working for people who wants to enable/disable their overlock, maybe because of bad room temps (summer) or whatever:
Set 2nd slider max
value to something lower than the 1st slider (which should be 1312 mV anyway). In theory, if you do that the software slider will regulate the maximum boost voltage and if you set the CLK bins voltage ranges correctly, then you will be able to artificially create a Vrel PerfCap and so limiting the frequency too.
So basically you can OC/OV or UC/UV with one single slider rapidly.
Just an idea, need testing if someone is interested.
(the 2nd slider min value should be set the same as max value; afaik 2nd max has no influence, it just has to be greater or equal to 2nd min).
The strange part to me is the fact that software slider was "only" +100 mV with 2nd slider min set tom 1175. In theory it should have +137 mV (from 1175 to 1312).
Maybe MSI and other software are limited to +100 because of the sensor limit of 1275? No idea.
Originally Posted by Laithan
Unfortunately I could not identify any settings above a maximum of 1281.3V without a PERFCAP unless
the 3rd slider minimum and maximum values were identical.
This is to be expected. The bin selection occurs by 3rd slider min
value. So if your last bin has 1312, you have to set the 3rd min to 1312 too. And because 3rd max must be equal or greater than 3rd min, they happen to be the same.
In theory you could set 3rd max above 1312 but it will not change anything.
However, I went back to give a look to stock BIOS and in that case 3rd min does NOT
match the max voltage of the top bin used by stock BIOS boost.
Conclusion: 3rd slider should
be the bin selector but further investigation is needed. However since we aim to bin 74, we should not bother with it at all and leave it to 1312-1312
Originally Posted by Laithan Testing with 1312.5mV and a 0-100mV voltage slider configured
+ 0mV = 1.237V
+20mV = 1.262V
+40mV = 1.275V - This is the first notch where 1.275V is shown via software. It must be truly only 1.275V as the PERFCAP was still NOT removed.
+70mV = 1.275V (MAX SOFTWARE CAN REPORT) - This is the first notch where the PERFCAP is REMOVED
.This is again proving without question that we are sending MORE THAN 1.275V to the GPU...as the Perfcap isn't removed until +70mV are added
This confirms that 2nd min influences both software slider value and the effective voltage sent to card. This can be used for the point 4 I suggested above.
Originally Posted by Laithan It does not answer the $1 million question..does it send 1281.3mV or 1314.5mV?!?
The voltages aren't all that far from each other really anyway..
I asked you some posts above but maybe you haven't read: do you know the measuring points? I can take the DMM and try it out but I don't know the points on the G1.
Originally Posted by Laithan
Oni, what is your max GAME STABLE overclock with your BIOS?
Your ASIC is slightly better than my best one.. I am curious if with V4BETA you lose any GAME STABLE clocks.
I have no idea right now
The fact is that when I OCed first time, the card was under air and with old BIOS version.
I suspect that lower temps and new BIOS improved the stability quite a lot.
Temps because higher temps = higher electrical resistance. This should increase the voltage in theory but also increases the current loss.
Well, it's just a guess, I'm hitting again my physics knowledge limit.
The idea that the stability improved a lot comes from the fact that if I remember correctly, I was unable to run 1531-8000 with neither artifacts nor crashes before watercooling/updated BIOS.
I may probably do another benchmark OCing tomorrow but currently I'm not playing PC games much (damn Monster Hunter
) so I can not assure a game stable OC :/
If it may help, I'm folding with my card all the time when I'm at the PC. I've read that folding is kinda "OC-sensitive" so may it be a sign of stability.