Originally Posted by Slackaveli
hi again, ansau. Sorry you had so much trouble but Im glad to hear you still rollin along. From what I can see you were just unlucky in the lottery. But, still, the range on these are pretty much high end 4.1-4.3, nobody is really running anything different. Most of us hit "the wall" where a lot more volts are need for a 100mhz jump. Some the wall comes after 4.3 (golden), some after 4.2 (common) others after 4.1(unlucky). You are the only one Ive seen where the wall hits after 4.0 (very unlucky), BUT, the difference between 4.1 and the 4.2 most of us run on is almost negligible. You just had to climb the wall to get to 4.1.
As far as "safe overclocking voltages", im sure 1.4v is fine but would start getting nervous past 1.45+
Originally Posted by nizinizi
If you belive me I have done 4.2 at Auto voltage, and 4.3 at 1.25V stress test stable. But that was with 2gb 1600Mhz RAM, and without Cache overclock. 4.4 required about 1.39V, and 4.5 wasn't stable at stress test even with 1.475V.
After installing 16GB 2400Mhz RAM it started to require more voltage (but I also overclocked cache, that put additional stress). 4.4 was not stable anymore on 1.39V but instead required about 1.425V.
I would like if someone here can do 4.5 stable at some voltage which is not dangerous, but he can't really know it unless try and test. Every CPU is different.
Btw., who is running 1.45+ and 1.55V? Broadwell guys or others?
OK guys, I want to figure out which chip is good, decent, unlucky and gold.
Only statistics, figures and facts.
1. Silicon Lottery biining 5775C as 4.2, only one simple - 4.3. And example : 7600K binning 5 variants - 4.9, 5.0, 5.1, 5.2, 5.3. 6600K even 7 variants - 4.4, 4.6, 4.7, 4.8, 4.9, 5.0, and one 5.2.
2. But I realized that the guys-overclockers disliked the Broadwell-С, he was badly binnings, and in general he did not work well on synthetic tests (but in games he is still king, what we need).
3. Statistics from this topic
i7-5775C 4.2 - 1.354v 63 °C
i7-5775C 4.0 - 1.232v 69 °C OCCT
i7-5775C 4.19 - 0.952v 55 °C
i7-5775C 4.2 - 1.276v
i7-5775C 3.6 - 1.214v 67 °C
i7-5775C 3.6 - 1.22v 49 °C
i7-5775C 3.6 - 1.129v 49 °C
i7-5775C 4.5 - 1.476v 71 °C off HT
i7-5775C 4.2 - 1.349v 58 °C
i7-5775C 4.5 - 1.423v 64 °C
i7-5775C 4.3 - 1.359v 69 °C
i7-5775C 4.0 - 1.249v 79 °C (out this forum, LinX test, undelid, most cold core - 47 °C )
i5-5675C 4.4 - 1.465v 55 °C
i5-5675C 4.2 - 1.277v 48 °C
i5-5675C 4.3 - 1.355v 47 °C
i5-5675C 4.0 - 1.29v 59 °C
i5-5675C 4.4 - 1.349v 52 °C
i5-5675C 4.1 - 1.295v 62 °C
4. Extreme OC statics from HWbot:
FUGGER - cascade - 5.2 - 1.55v (2 threads), 5.0 (HT off) 1.572v, HWbot Prime - 4.9 1.576v, Single Stage Phase 4.79 - 1.464v 13 °C
SAMBA - air - 4.7 - 1.62v 38 °C (2 threads), 4.5 - 1.441v
ALO 4.4 - 1.394v 69 °C
H2O (chilled) - 4.9 - 1.48v 21.6 °C
XTU ALO - 4.4 - 1.322v 67 °C
Gold chip Broadwell-C - 4.5 on 1.44 or less
Good - 4.4 on 1.38v
Nice - 4.3 on 1.33v
Medium - 4.2 on 1.29v
Unluck - 4.1 on 1.28v and less