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Changing BCLK on Ivy Bridge for 24/7 Overclock - Page 2

post #11 of 16
Thread Starter 
Quote:
Originally Posted by inedenimadam View Post

Bumping this topic rather than starting another thread. I am in a similar position as the OP, whereas I would benefit from being able to adjust the BCLK a little, but have heard so many conflicting stories. The only difference is that I am interested in the repercussions of underclocking it.

I found zero gain in BCLK. All you have to do is find where you are stable at. So I found 5ghz@1.499 to be 50+ hours of prime95 stable. Maybe you can use 24 hours of prime95 as your bench, or aida634, whatever, as long as you are consistent in the bench (though the more authoritative, the better).

So then I tested, like, 4.9x102, and i crashed all the same, just like 50x100. Conversely, I also tried the same 5ghz@1.499v settings, with 101bclk (so 5.5ghz). Crashed.

Quote:
hmm, i do remember noticing my i7 3770k was unable to boot starting around a CPU frequency of 4800mhz or so on my previous Z77X-UD3H, but when i used ET6 to check for the limits of the chip, the thing was booting up at 4980mhz with a BCLK of 103 or 104, can't remember which.

Would also love to know the answer smile.gif

for whatever weird reason, sometimes your BCLK is offset. You can choose to just ignore and whatever, or you can attempt to correct it. So like in your case, maybe set your BCLK to 96-97 in BIOS, so it runs at 100mhz. I set my BCLK on my z87x-ud3h to 100.1, because at 100 it would run at 99.8mhz.
Quote:
I would not suggest it.

I ran with 103 OC for a while without any problems, however I eventually decided the small performance gain wasn't worth the risk.

Reasoning: 104 OC was unstable to the tune of one crash / week. Who's to say that my 103 OC wasn't unstable at one crash / month or something? Since the BCLK affects so many different systems, there is no real way I know of to stress test everything it affects, as there is for CPU, GPU or RAM overclocks.

I run some computational stuff on my PC for work. A single crash ever due to BCLK OC would destroy any benefit the small performance I would gain.

You can always stability test it, the same as anything else, just run p95 for 24+ hours (or as much stability as you deem necessary). It seems to me that it's near-unheard of that people find mroe stability using bclk, or able to increase their oc using bclk, but it's worth a quick attempt once you dial it in using multiplier.
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post #12 of 16
Quote:
Originally Posted by Belial View Post

You can always stability test it, the same as anything else, just run p95 for 24+ hours (or as much stability as you deem necessary). It seems to me that it's near-unheard of that people find mroe stability using bclk, or able to increase their oc using bclk, but it's worth a quick attempt once you dial it in using multiplier.

BCLK is the only way I can overclock, having a non-K processor. p95 is only for CPU/memory usage, but BCLK affects other systems too. For me, it was PCI-e that became unstable at 104+.
post #13 of 16
One thing I have noted with BCLK overclock you will use much more voltage at 48 X 100Mhz than you will use at 47 X 102Mhz in stability tests, which made me come here to know whether there are any bad side effects on this.
post #14 of 16
I am using the BCLK with X79 (actual, not strap) because I get essentially an extra 180MHz for "free" in regards to voltage. 1.355v will giveme eeither 100x48 or 103.8x48.
   
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post #15 of 16
Only in haswell you will be able to change bclk to level where you can notice a performance boost
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post #16 of 16
Quote:
Originally Posted by Belial View Post

for whatever weird reason, sometimes your BCLK is offset. You can choose to just ignore and whatever, or you can attempt to correct it. So like in your case, maybe set your BCLK to 96-97 in BIOS, so it runs at 100mhz. I set my BCLK on my z87x-ud3h to 100.1, because at 100 it would run at 99.8mhz.

ill admit that my UD3H did show offset BCLK but, it was never to a degree of 1 MHz or rather a full 3-4MHz, it was more like 0.1MHz through 0.3MHz and absolutely nothing higher.
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