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***The Official Core i5 Overclocking Thread***

Well I've played around with my BIOS quite a lot now, including a fresh reset, I can't get the cpu to down clock and conserve power when I am overclocking, I think it might be linked to the BCLK setting, although it doesn't say so anywhere, I have a hunch that once I enable BCLK altering, it stops the cpu down-clocking, despite what the options say, I have even tried forcing the power saving features to enable rather than leaving on auto, still no joy, tried playing with Windows Power profiles too, it seems very odd, it could be a bug though I suppose, this is the 1st Bios for this board after all.

There is a beta BIOS for the UD2 on Gigabyte's website as of today, apparently it improves overclocking, doesn't give any more info than that though.

In the end I hit 77c under P95 at 3.8 GHz using 1.35v in the Bios, although, as usual, CPU-Z says it's a good deal less than that.

Screenshot after 15 minutes of P95 at 3.8GHz

Seems to be taking substantially more voltage to get it prime stable at 4GHz, I think I'll leave it at 3.8, seems like the sweet spot.

Last week I said something along the lines of the I5 is faster than my old Phenom II x4 940 BE, (both at stock speeds) but not really in any greatly noticeable sense, only really when benchmarking. Well at 3.8GHz ...it's noticeable alright, it absolutely flies now, using a BCLK of 200 and a multi of 19.

Edit Thanks for the link Duke, I don't have an Asus, but I still found that useful, I found out that I made a slight error, I left CPU PLL on auto, rather than forcing it to 1.8 default and increasing as need be, I didn't realise it would go and whack the voltage up it's self, now I have it set manually to something like 1.85*v it's shaved a few degrees of my temperatures, priming at 74-75 now, rather than 77-78.

I must say, I'm quite impressed with the UD2 so far, but it is rather cramped, with my Noctua installed it's only just clear of my graphics card, it also obstructs the nearest ram slot to the cpu socket and with the graphics card and Noctua in, I don't really know how I will release the annoying PCI-E clip to get the card out :p ...(DFI don't have those ruddy things) ..I'll have to slide something in there to do it I think, no way I could get my hand or fingers down there now
 
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Getting an i7 860, gigabyte UD5, Corsair 8GB 1600C9 RAM, Intel SSD and Noctua SE2 cooler as a replacement for my limping p4 rig and I was going to run it at stock but am now tempted to up the base clock to 145 to get performance similar to a stock 870.

I am an overclocking newbie and wondered if this would work. Can I keep stock voltages, all the power & performance benifits with turbo mode on but with a mild overclock? I have read that turbo is unreliable when overclocking is this true even when it's such a mild overclock?

I was worried by the Anandtech comments that the base clock would need to be a multiple of 133 to keep the built in pcie interface in tune. What's the real world implication of not doing so?
 
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So am I correct in thinking that after a bit over a week of this kit being out in the wild, we have 2 or 3 proven stable overclocks, only one of which is at or over 4GHz?
 
Looks that way here on OcUK yea.

I suppose I haven't really 'proven' mine is stable, I didn't think people were 'that' interested to be honest, I expected a load of results to be up by now though I suppose.
 
WJA96 said:
So am I correct in thinking that after a bit over a week of this kit being out in the wild, we have 2 or 3 proven stable overclocks, only one of which is at or over 4GHz?
Click to expand...

I have managed 3.4 on stock cooling with small voltages but dont have the money to get a new cooler atm. When I do I would expect 4ghz stable undoubtedly.

As for which processor, then 750 is the one if your only gaming and doing day to day jobs. If your doing anything like encoding or video rendering as well as gaming get the 860. I have seen people on the forums getting 4.2/4.3 out of them so they clock slightly higher than the 750; but also have HT.

The Geil RAM is better than the Ripjaw but I would think the Ripjaw is enough for most peoples needs, and it will clock plenty high enough.
 
Ok here is a CPU-Z, Super-Pi and Cinebench 64 Bit at 4GHz

First time I have ever seen Cinebench come out with a score of over 20K on anything I have owned :)

I need to do more testing before I declare it as 'stable' though.


Edit:

Ok after some Prime95 testing, it is not stable at 4GHz with 1.38** volts in the BIOS, I've tried raising the CPU PLL a touch, to 1.860 ...that didn't seem to help, then again I'm not running more than 200 BCLK to keep my memory in spec, so I wouldn't expect much effect from that.

I am pretty certain with more voltage in the right places, I could stabilise this chip at 4GHz, it'll run everything I ask of it, including Cinebench at 4GHz, but not P95, it errors out on 1 core.

I went back down to 3.8Ghz and reduced voltages accordingly back down to 1.35v ...I had passed 1 round of Prime95 blend on this no problem, and it hasn't crashed doing anything, I decided to run P95 for longer, and I actually turned up with an error on Core 0 after 32 minutes, near the beginning of the 3rd pass, same core which gave me an error straight away at 4GHz

Screenshot

I have noticed that CPU-Z doesn't really correspond with the voltage settings in the BIOS for the cpu, and right now it isn't even reading my +12v line, however, if you look at the screenshot, it was reading it for that 3.8GHz stress testing, and recorded an idle of 4.42v on the +12v line and a load of 16.26v ...I have never seen anything like that before. New board and new power supply though. I'm using an Antec Signature 650w.

I need to tweak to stabilise 3.8GHz, I think it’s going to take more volts than I am comfortable with to get it stable at 4GHz though. Myabe on a beefier motherboard I could, I don’t have any mossfet cooling on this one. It was the cheapest board on launch day though :p (at retail prices).


Interestingly I have reset to stock settings now, and Hardware Monitor wasn't reading the +12v or -5v it was before when Priming, now I have fired Prime up, it's reading them, they both seem to varying, depending on what I do, especially the +12v line. The Power reading for the cpu that HD Monitor shows is reading much higher values than it was when it was over volted and clocked to 3.8GHz, it's hitting 112.06 W when Priming, it was set at about 82 W before and didn't really vary very much. I just think Hardware Monitor is reading strangely here, the system seems perfectly fine.

Has anyone else running a P55, Gigabyte board or not, observed odd behaviour from Hardware Monitor 1.14.0 ?
 
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Hi
Custom wc,room is hot tho could be beter temps.
ram is G.Skill Ripjaw DDR3 PC3-12800C7.
Just left overnight and done 12 hours prime no problems will post screen later.:)
 
ah ok thanks, nice overclock seems ppl are struggling abit to hit 4ghz stable on the 750 ?
 
Can anyone point me at figures for overclocking an 860 with all turbo modes working and stable on stock voltage with good air cooling?

Was hoping to up the bclk to 145 and get the following at stock voltages:

3/4 cores 22x145=3190
2 cores 25x145=3625
1 core 26x145=3770
 
Hi all im new to overclocking so after some advice :)

Can anyone tell me what safe temps for i5 750 4Ghz overclock when running under load in prime95 are?
Currently mine sits around 70-75 and maxing at 79 after around 8 hours of prime

My CPU Voltage is set to 1.362v with 20x200, EIST and CIE disabled.
Memory QPI set to [16] Dram Freq 1600Mhz with DRam voltage set to 1.65
All other volts are set to Auto

Can someone confirm that this is ok and any tips for reducing volts etc?

Thanks :)
 
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Keep it under the high 80s at full load I'd say, basically you don't want to be seeing 90+

20x200 is 4Ghz ...so I'm not sure what you mean when you say it's 3.6. I would manually set your PLL voltage to 1.8v too, increase a notch or 2 as needed, I wouldn't go over 1.9v though, indeed you should not need to either. Don't leave it on auto, there is no guarentee that it won't increase this too much to insure stability, this voltage setting is the easiest to do damage with if not handled with care, and leaving the motherboard to to it's own devices when running the BCLK at 200 rather than 133 ...is a bit risky really, well I wouldn't trust it anyway.
 
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Moeks said:
Keep it under the high 80s at full load I'd say, basically you don't want to be seeing 90+

20x200 is 4Ghz ...so I'm not sure what you mean when you say it's 3.6. I would manually set your PLL/VTT voltage to 1.8v too, increase a notch or 2 as needed, I wouldn't go over 1.9v though, indeed you should not need to either. Don't leave it on auto, there is no guarentee that it won't increase this too much to insure stability, this voltage setting is the easiest to do damage with if not handled with care, and leaving the motherboard to to it's own devices when running the BCLK at 200 rather than 133 ...is a bit risky really, well I wouldn't trust it anyway.
Click to expand...

Sorry made a mistake posting lol, It is running at 4Ghz (20x200)
the CPU Voltage was wat i meant and is at 1.362

If i went to set the VVT to around 1.8 as you suggest this is flagged up as red text is that right?, auto is shown as 1.26V in the right hand column.
 
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