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~~~~~IMPORTANT SANDYBRIDGE OC INFO: Voltages & OC Guide!!~~~~~

What's happened to OcUK overclocked bundles, suddenly you are selling them overclocked to 4.4ghz only down from 4.6ghz, just about when I was going to make a purchase ie

"Radon Allosaur" Intel Core i5 2500K 3.30GHz @ 4.40GHz Overclocked Bundle - Asus
 
apatia77 said:
What's happened to OcUK overclocked bundles, suddenly you are selling them overclocked to 4.4ghz only down from 4.6ghz, just about when I was going to make a purchase ie

"Radon Allosaur" Intel Core i5 2500K 3.30GHz @ 4.40GHz Overclocked Bundle - Asus
Click to expand...

They are doing further testing, as some bundles are just hitting a wall beyond 4.4GHz irrelevent of voltages used which could mean some CPU's hit a wall at certain speeds or its something else holding back. As such bundles will be 4.40GHz from now on.
 
Gibbo said:
They are doing further testing, as some bundles are just hitting a wall beyond 4.4GHz irrelevent of voltages used which could mean some CPU's hit a wall at certain speeds or its something else holding back. As such bundles will be 4.40GHz from now on.
Click to expand...

Which is still a great overclock imo, 600-700mhz over original 2500k/2600k
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Mines just Primed for 4 hours at 4.5ghz 1.31v and i'm happy with that. Not going to faff around trying to get a little more out of it until some bright spark figures out the ideal combo of settings. It took me an extra 0.14v to get an extra 500mhz. Just not worth it.

Oh, and 4.6 at this voltage craps out of Prime in 7 minutes lol.
 
Gibbo said:
They are doing further testing, as some bundles are just hitting a wall beyond 4.4GHz irrelevent of voltages used which could mean some CPU's hit a wall at certain speeds or its something else holding back. As such bundles will be 4.40GHz from now on.
Click to expand...
Interesting.

Personally I found that this CPU (The i5 2500k) was fine at 1.3v for 4400Mhz, but 4.6Ghz proved to be a bit of an issue. Amazingly, it was OCCT stable at 1.32v using LLC Level One (Full load = Vcore increase) on my ASRock P67 Extreme 4, but if it idled for too long, it would BSOD with "Uncorrectable hardware error".

This continued at 1.35v too, leading me to wonder just what was going on. Now I am at 1.38v, but using LLC Level Two which lowers the Vcore on load. It has now been stable for 24 hours and at load, isn't too far above the 1.35V you recommend.

Still, I have not seen a CPU that is 100% stable under load, yet when it isn't doing much, crashes due to undervoltage. I'm wonddering if it's a mobo issue that could be sorted via a BIOS, sorry UEFI fix as turning off Speedstep and Halt States done little to help the issues. Still, cannot complain, a 1.3Ghz OC from a £180 chip, nice!
 
Stop It Rawr said:
Interesting.

Personally I found that this CPU (The i5 2500k) was fine at 1.3v for 4400Mhz, but 4.6Ghz proved to be a bit of an issue. Amazingly, it was OCCT stable at 1.32v using LLC Level One (Full load = Vcore increase) on my ASRock P67 Extreme 4, but if it idled for too long, it would BSOD with "Uncorrectable hardware error".

This continued at 1.35v too, leading me to wonder just what was going on. Now I am at 1.38v, but using LLC Level Two which lowers the Vcore on load. It has now been stable for 24 hours and at load, isn't too far above the 1.35V you recommend.

Still, I have not seen a CPU that is 100% stable under load, yet when it isn't doing much, crashes due to undervoltage. I'm wonddering if it's a mobo issue that could be sorted via a BIOS, sorry UEFI fix as turning off Speedstep and Halt States done little to help the issues. Still, cannot complain, a 1.3Ghz OC from a £180 chip, nice!
Click to expand...

FYI not had a BSOD since day 1 with my SB.

Imo, there is a big voltage increase required between 4.5ghz and 4.6ghz on the majority of chips to be fully stable, yes there are a few golden examples that can run on silly low vcores, but as a rule 4.5ghz can be had for 1.3vcore for a large percentage of users.
 
dave_beast said:
FYI not had a BSOD since day 1 with my SB.

Imo, there is a big voltage increase required between 4.5ghz and 4.6ghz on the majority of chips to be fully stable, yes there are a few golden examples that can run on silly low vcores, but as a rule 4.5ghz can be had for 1.3vcore for a large percentage of users.
Click to expand...
Well, I have been BSOD free for well over 24 hours now (Where-as before it would be within 10 minutes of load stopping at times) so I was certainly undervolting the chip. As for the voltage requirement threshold, I have certainly needed a lot more VCore to get from 4.4 to 4.6Ghz, it makes me wonder if I should just try 4.8Ghz using the same settings and see what happens. If it is stable I may as well use it.

Thanks for the input though, I would love to know if anyone more clued up on these chips could explain why my system was BSOD'ing on idle but never under stress using lower Vcores. I'm sure there's an obvious answer somewhere but I'm stumped at the moment.
 
meh my 4.4ghz wasn't prime blend stable at 1.3vcore bios so I've just bumped it up to 1.31.

At least I've got my frio now so no more 77c temps with the stock cooler :p (currently 50c with 1 fan, 2nd fan not working on chassic header?)
 
PCM2 said:
Incidentally the ASUS P8P67 has a little 'mem OK' button and a bright red LED near the RAM slots. If the RAM malfunctions during POST (which happens at under 1.625 vcore it seems) it lights up. Turning the power off then on again or holding down the button always leads to successful bootup. I am contemplating sending the RAM back to OcUK but I'm not sure if it's worth the hassle and inconvenience if it running at 1.625 is fine for the system.
Click to expand...

I'm glad I'm not the only one experiencing this. It's slightly annoying and was tempted to send my RAM back also but I figure if it means resetting the machine upon boot up just so I can run the RAM at the speed I paid for then might as well live with it!
 
hmm something strange is happening with my temps, it was topping out at 50c during prime blend but now it tops out at 30c?!
 
Well, a little update, as it appears I was correct.

BIOS/UEFI revisions seems to play a major part in Sandy Bridge overclocking capabilities, make sense as it's a new chip, but still, this is a bit dramatic. I was using a "PLL voltage fix" bios from hwbot, as I thought that may help with my OC adventures, turns out I was very very wrong.

Firstly, after reverting to an official (And newer) ASRock UEFI, Turbo has re-appeared (It had vanished before), setting my VCore voltage at auto for 4.6Ghz sets 1.32v in bios, 1.36v, 1.336v under IBT load rather than the 1.38v+ the older bios needed to boot and be stable. I just passed an IBT run and as long as I don't get any random BSOD's, ot looks like I am in the clear.

It's strange though, same machine, chip etc, yet a change in the very low level like the UEFI can be the difference between a CPU being stable at lower voltages. Not complaining though, as I wanted to stick to Gibbo's overclocking guidlines and it appears that I should be able to now.
 
I am hitting a wall at 4.3ghz at 1.280v with my i5-2500k, if I go any higher the machine fails to boot windows - like Todge at 4.6 with the original BIOS. I am going to try the 1053 beta BIOS to see if that enables me to go higher.

EDIT: Updated the BIOS to 1053 beta which you need to do from a FAT drive and the machine now boots at 4.5, running Prime 95 now for stability auto volts 1.296v max temps seem to have gone down to 68C from 71C :)

EDIT2: It will do 4.6 but needs 1.35v which is an extra .05v for 100mhz more, not worth it IMO. I think 4.5 should be the max 24/7 people should expect (with up to date BIOS and decent air cooling)

EDIT3: Sod it whacked it up to 4.6 and expected to see a big increase in temps but its only gone up to about 72C now which aint half bad :)
 
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