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Ivy Bridge (Z77) OC To 7Ghz and beyond!

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  #21  
Old 04-28-2012, 23:18
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^ that all still depends on the chip, some chips have a much higher starting point, some chip will always shut down when you are cold and some will not
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Old 04-29-2012, 00:46
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Ahh okay.
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  #23  
Old 04-29-2012, 16:55
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Just bought 3 CPU's at Tones, 2x 3770K 1x3570K.
On cascade, one 3770K does 6Ghz Pi with 1.75v.

Time for LN˛
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Old 04-29-2012, 21:06
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nice ho cold is your cascade?
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Old 05-02-2012, 05:53
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SR0PL Batch# L206A973 5.72GHz at 1.75V would do wp32 and wp1024. Trouble getting into windows at 5.8GHz, though with more time/voltage I believe it could do it.
http://hwbot.org/submission/2279683_
http://hwbot.org/submission/2279684_

Cold boot bugs at -85C at the base of the pot, cold bugs around -115C at the base of the pot (my current temp probe reads -180 when dipped in LN2, so actual readings on probe were -75C/-105C). Tested CPU PLL from 1.7V to 1.95V (default read 1.812 in BIOS). Tested bclk from 105-110, trouble getting higher bclk to post. Tested CPU voltage from 1.0V to 1.75V. None of these items, with or without LN2 mode enabled on the MVG, made any difference at all upon the cold bug behavior of this particular chip from what I found.

I did not test RAM. Really only tested cold bug behavior, and once I found I couldn't work around it with anything I was trying, I didn't want to press the chip any harder - it will be sold.

Looking to get another from a different store (and hopefully different batch) in the next week or two.
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Old 05-02-2012, 15:19
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I didn't try 2V+ on PLL or anything about 1.75V core. I bought the chip retail, and am selling it so that I can try another chip... I didn't want to beat it up so that I could sell it in good faith.

Keep in mind my probe is bogus. I 'm pretty much at the exact same CB/CBB everyone else is talking about... My probe reads 10C warmer than it actually is. It is consistent, just inaccurate.

With the settings I changed in the ranges stated, none of them had ANY impact on CB/CBB, 1.0Vcore to 1.75V, 1.7PLL to 1.95PLL, 105bck-110bclk, CB/CBB was exactly the same regardless of settings... Maybe 2V PLL or 1.85Vcore will make a difference. If the next chip I buy does the same thing this chip does, I will try those settings.

I think no-CB could be totally blown out of the water so far... Coldbugs are beginning to look a lot more common if you look around at retail experience than we were lead to believe, or maybe more common than I wanted to think. I for one know that this IB can easily do 5.7Ghz which was really hard to do on my best 2600k, and yet I consider it a crappy chip - if it can't do 6GHz and run really cold, it isn't what I was really looking for in Ivy Bridge.
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  #27  
Old 05-02-2012, 18:36
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Thank you. Those seem like pretty harsh voltages at warmer than -100C I guess. 2V PLL doesn't seem too bad, but 1.9V on the CPU seems scarey without being at -190C already (maybe I'm a wuss, these chips are just new and I'm definitely being a wuss). I'll get braver with the next chip if it behaves similarly to the first.
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Old 05-02-2012, 22:19
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i run a few CPUs full pot, but yes i had a 3570K that acted like yours, then i changed the BCLK and it was all good.

Can I ask does the CB/CBB get worse with 100.00 BCLK?
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Old 05-03-2012, 01:52
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You know, I didn't really test that... Everything I read said start at at least 105MHz to avoid CB/CBB, so I didn't even test <105MHz. Now I'm kinda curious. The chip may be sold already, but if not I may check that out.

When changing the BCLK on your 3570K that acted like mine, what temp was the coldbug at? What BCLK was it at when it coldbugged low, then what BCLK did you change to which eliminated/made the cold bug better? Seems odd that BCLK would change the coldbug... But I'm really hopeful to get another chip. Heard the same from others as well, so I just want to be a believer!
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Old 05-03-2012, 02:27
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without BCLK, like with 100.00 BCLK i had CBB at -70C and CB at -125C, when i changed BCLK to 110 it started to do much better, CB was -155, and if I BSODs in windows I had no CBB, even if i wanted to change the BCLK again higher I wouldn't trigger it, however if i went above -155C like i hit -160C then I would be forced to go back to -70C.

Yea I made a video of it to prove it to Dino, he wouldn't believe me, lol. So i could just make a video of changing the BCLK and having a CB at -120C, then changing the BCLK and going down to -155C, and then back and forth back and forth. I had a hunch about this for a while, as some CPU didn't have a CB at all, but then I would reset BIOS and it would have a CB, but i always ran it at 110 when i did subzero OC anyways. Then again why would CPU PLL voltage help CB on other platforms? It is just as odd as BCLK to me. Perhaps with Ivy it has to do with the memory controller or system agent, and the increased BCLK changes something. I tested and found that as little as 3mhz above stock could have the same CB/CBB affects as 110.

BCLK has the most major impact I have seen for CB/CBB, for me and some other CPu PLL doesn't help CB/CBB, but perhaps the CPUs are just best at 1.8v, as higher made it worse. Now I use a bit more CPu PLL if not only to stabilize things, like 1.82v.

I used upto 2.2v CPU PLL on a CPU with CB, it didn't do much, i was scared it might die tho.
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