Ive had no luck lower the vcore just fails to post, I tried a 191 BLK x 21 multi with everything the same and have to push the vcore to 1.35v to get it to start.
I have seen people posting 4.0Ghz with a vcore of 1.25/1.26, I got to 3.8 with a vcore of 1.26 but cant get higher unless i up it to 1.35
jimbo_0002;5441157Sorry i wrote the vtt down wrong its 1.175v should I be increasing this a little?, Ive changed ram to 1.66v now.[/QUOTE]
Ok that's alright then. I would try bumping it up to maybe 1.25v and dropping your CPU multi down and see how high you can get your BCLK first. I'd slowly bump the BCLK up, and run 15 min of OCCT on large data set until it fails, then drop it down 5Mhz or so and do a 30-min run. That way if you run into any instabilities you can pretty much narrow it down to vcore. IIRC according to Intel the max VTT voltage for "safe" use on 1366 chips is 1.35v.
[QUOTE=jimbo_0002;5441164]Ive had no luck lower the vcore just fails to post, I tried a 191 BLK x 21 multi with everything the same and have to push the vcore to 1.35v to get it to start.
What voltage is CPU-Z reading while under load?.
I noticed you have the Gigabyte UD5, i would image most of the BIOS options are the same as my Gigabyte P55-UD6. What options does it give you for Load Line Calibration? (should be under Advanced Voltage Settings if its setup the same as mine).
1.35v for 4.0ghz isn't that bad.
You just happen to get lucky and have a high leakage special. That chip sounds like it should be golden for the cold stuff if it needs tons of volts for low clocks.
Does it run hot too?
Any change to vvt it seems crashes and can not boot. Load line Calibration has Standard, Level 1 & Level 2. And 1.35vcore under load the vcore is 1.32v on cpu and occt says its 1.33v
@Omen Well it runs at 4ghz getting an average 67.5 degree C* at 100% load with 1.35vcore
I've been playing with vcore 1.31v starts but shows 1.29v on cpu-z and just crashs when occt test, I just cant seem to go much lower then vcore 1.35v ever when up'ing the VTT, Is having a 1.35 bad for the cpu? would 3.8Ghz be better cause i can get to that with 1.26 vcore.
jimbo_0002;5441513Is having a 1.35 bad for the cpu? would 3.8Ghz be better cause i can get to that with 1.26 vcore.
1.35v is fine. Even 1.4v would be fine as long as you keep it cool. Like Kow said its not really that bad for 4.0Ghz.
I would personally just go with 3.8Ghz. Your not going to notice that extra 200Mhz going from 3.8 to 4.0 at all outside of benchmarking. You really only need around 3.6 to eliminate any bottleneck.
Hmm well if i cant get this 4Ghz stable enough I might just drop back down to 3.8Ghz, Its annoying the shit outa me trying to get it stable
I have settled with 3.8Ghz 2 hours stable OCCT Large Data so far, Ive also overclocked my 580 to 850/1700/2100 just because im getting in the OC spirit and never oc'd a gpu before.
Now I need help fixing my ram timings if possible, is there a way now I can boost my ram up closer to 1600Mhz? Or is stuck to the 166x8 = 1333Mhz?
Dont know if I've done this right but I've set ram multi or what ever it is to x10 so i get 830Mhz (2:10=1660Mhz) So its a slight oc on the memory which should be ok? I have also changed my timing to 8-8-8-24 2t instead of 9-9-9-24 1t which they were at with auto set on the timing. Have I done this correctly?
For memory tweaking i always use Memtest86+. Change your timings one by one and see if it passes memtest86. Just keep repeating that process till you get to the lowest timings where it doesn't give any errors or simply fail to POST.
You might even be able to go lower on the timings depending on your sticks. My Mushkins for example are doing 6-7-6-17 @ 1520Mhz.