8.5 hour Prime95 stable @ 4.2 GHz, 1.272v...what now?

[996GT2]

Would this be considered stable enough for daily use, or should I further test with Intel Burn tool and other programs?

Also, is it correct to disable turbo mode when overclocking?

 

[richierich1212]

Nice, even on the UD3, lol.

 

[Avalon]

I think leaving turbo on is fine if you're not noticing any issues. Eight hours is usually all I run, but if you have anything mission critical I'd probably run it for 24 hours. Looks good, though!

 

[wanderer27]

Are those Voltages right?

A few of them don't look correct to me, but maybe it's just the tool or design.

 

[996GT2]

I think leaving turbo on is fine if you're not noticing any issues. Eight hours is usually all I run, but if you have anything mission critical I'd probably run it for 24 hours. Looks good, though!

Do the turbo multipliers need to be set manually then? Right now the highest turbo is set at 3.7 (1 core active), so should I set to 4.6 (1 core active), 4.5 (2 cores active), and so on?

 

[996GT2]

Are those Voltages right?

A few of them don't look correct to me, but maybe it's just the tool or design.

The gigabyte app says 1.272v, which I think is more accurate than the low value CPU-Z reports.

 

[Thor86]

I'm assuming this OC is for your new SB setup. Disabling Turbo would only be for MAX OC, but from the reviews, SB is a perfect OC chip that you would not need to disable as the powersaving feature works on a daily usage base with OCing.

I would run Linx as the next step to testing for OC stability.

 

[Castiel]

4.2? That's it?

 

[RussianSensation]

I think leaving turbo on is fine if you're not noticing any issues.

Disabling Turbo would only be for MAX OC, .

From what I read, you can't overclock K series chips unless Turbo is enabled. You then have to specify what level of Turbo you want for 1, 2, 3, or 4 cores.

"Overclocking Sandy Bridge CPUs is different in another way, too. While everyone has their own overclocking techniques, I generally like to disable "turbo" features and run all processor cores as fast as I can under stress by raising the base multiplier. Well, you can't do this with the Intel Core i7-2600K: in fact, you can't increase the base multiplier at all! I suspect this limitation is built into either the processor or the P67 chipset. Your only option is to increase the multiplier that will be used by Turbo Boost, and you can set individual multipliers to be used when 1, 2, 3, or all 4 cores are in use. Thus, if you disable Turbo Boost technology, you can't overclock the processor at all. " - BenchmarkReviews.com​

 

[996GT2]

From what I read, you can't overclock K series chips unless Turbo is enabled. You then have to specify what level of Turbo you want for 1, 2, 3, or 4 cores.

"Overclocking Sandy Bridge CPUs is different in another way, too. While everyone has their own overclocking techniques, I generally like to disable "turbo" features and run all processor cores as fast as I can under stress by raising the base multiplier. Well, you can't do this with the Intel Core i7-2600K: in fact, you can't increase the base multiplier at all! I suspect this limitation is built into either the processor or the P67 chipset. Your only option is to increase the multiplier that will be used by Turbo Boost, and you can set individual multipliers to be used when 1, 2, 3, or all 4 cores are in use. Thus, if you disable Turbo Boost technology, you can't overclock the processor at all. " - BenchmarkReviews.com​

Eh, I have turbo mode disabled right now and I am at 4.2 GHz on my i5-2500k. Disabling turbo just means all 4 cores run at the same speed, and there is no "additional" boost if you only have 1 or 2 cores active.

 

[OCGuy]

Nice numbers....!

 

[BTRY B 529th FA BN]

LinX
Memtext HCI

check how many watts that is drawing while idle, it may not be worth it.

 

[RussianSensation]

Eh, I have turbo mode disabled right now and I am at 4.2 GHz on my i5-2500k. Disabling turbo just means all 4 cores run at the same speed, and there is no "additional" boost if you only have 1 or 2 cores active.

Thanks for clarification. Not sure why the guys at BenchmarkReviews were saying you needed it enabled. I actually read everywhere else that you needed to use power saving features and turbo multipliers.

 

[Spike]

Is there a benefit to enableing turbo? I have my 2500k and Asrock Extreme 4 coming and my desire is to hit a 4.6oc. Would it be better to go with a 4.6oc all the time or hit something closer to the OP like 4.2 and then set the turbo to 4.6 with a single core?

Just curious if you (OP) or anyone else has tried anything like this.

Thanks.

 

[996GT2]

Is there a benefit to enableing turbo? I have my 2500k and Asrock Extreme 4 coming and my desire is to hit a 4.6oc. Would it be better to go with a 4.6oc all the time or hit something closer to the OP like 4.2 and then set the turbo to 4.6 with a single core?

Just curious if you (OP) or anyone else has tried anything like this.

Thanks.

I haven't personally tried, but I don't think you can just turn on turbo mode without testing the higher clocks. For example, if you set your overclock to 4.2 and then enable turbo so that the CPU ramps up to 4.6 GHz with 1 core active, then I think you should clock all 4 cores to 4.6 GHz first and make sure that the CPU is solid at that speed. However, if you do that, I don't see a huge benefit in enabling turbo mode because you will still need to use the voltages that allow your CPU to be stable at 4.6.

If someone is more knowledgeable on this, feel free to correct me or clarify.

 

[borisvodofsky]

Put enough voltage in the chip to kill it in 2 years,, it's worthless after 1.5 years.. and you get teh upgrade itch within 6 months.. THATS how we roll at atot....

 

[CosmicMight]

Thanks OP, I will have the same cpu/mobo so this is of obvious interest to me.

 

[Suspicious-Teach8788]

Linx or OCCT Linpack is a lot more stressful than Prime IMO.

 

[spacejamz]

Newb OC question here..when you guys are overclocking these chips, does it constantly run at 4.2Ghz or does it idle around 1.6Ghz or whatever and then speed up as needed?

 

[RussianSensation]

Newb OC question here..when you guys are overclocking these chips, does it constantly run at 4.2Ghz or does it idle around 1.6Ghz or whatever and then speed up as needed?

If you enable all power saving technologies such as C1, C3-C6 states, EIST, etc. your chip should idle at 1.6ghz or so. With Core i7 1st generation, this was a bit different since the multiplier would fall but the Base Clock would not.

For example, with Sandy Bridge 2500/2600k, you'll have 100 Base Clock x 45 Multi overclock = 4500mhz at load. At idle, the base still remains at 100 but the multi drops to say 16.

My i7 860 loads at 186 Base Clock x 21 Multi but at idle it's 186 Base Clock x 9 Multi = 1674mhz at 0.96V.