Originally Posted by Mephic
Hi ppl - long time no see
Anyway I just wanted to add some new observations to Power Edition/Lightning voltage monitoring.
One of my friends from polish forums posted a chart lately which should be considered by many of us when adding voltages to 660Ti PE or PE OC Edition.
Voltages on Ligtning 680 measured with multimeter showed, that adding +50Mv does NOT result in 1.175 + 50 Mv. Voltage is scaling much more differently
And so this probably applies also to Power Edition.
Adding +50Mv resulted in almost 1,29v!!! This should be considered when overclocking high. And that would explain why I was able to clock my GPU to 1400 MHz on Core when added +100Mv (which is much higher than 1,3v, not 1,275 as I thought till now) and why the GPU was struggling to stay under 69 degrees.
I hope that some more tests will be made in this matter. Anyway - considering it be careful when OCing. In both 2.2.3 AB and newest BETA You can raise voltage for PE cards but the voltage won't show in GPU-z or MSI AB (and You all already know that). What You and I didn't know until now is the fact, that real voltage pushed into this card is higher than we thought it is. I'm still waiting for some more official tests to confirm that.
Anyway, my latest good for 24/7 OC is only +30Mv and +62 on core and +550 memory which results in astonishing 1280 MHz on core and 7100 MHz on memory and temps never go above 63 degrees with fan going at 58% MAX.
This is cool
I also managed to get some cool score in 3dmark13 with some different OC
5.950 pkt. - GTX 660Ti @ 1320MHz @ 3650 MHz - Core i5 3570K @ 4.5 GHz http://www.3dmark.com/fs/400213
I know it's not high score when comparing to AMD but AMD has much better optimized drivers for this benchmark. Anyway this score let me beat graphic score of stock GTX 680 (actually two different owners) on PL forum