New 2500K build OC Question

[essenbe]

I just built a new Sandy Bridge rig this weekend. Specs are in stats, but it is an i5-2500K on an Asrock P67 Extreme4 board, in an In Win Dragon Rider case (great case). Build completed yesterday. Today I OC it to 4.2. I set the ram to XMP and set the frequency. I left everything else on auto and just changed the multiplier to 42. After that I ran Prime95. After 1 hour of Prime This is what I am showing. All voltages are stock (auto).


Does anyone see anything wrong with this?

 

[smarteyeball]

Temps are good, volts are fine.

RAM timing looks a little loose though.

 

[Shootist]

I thinking you will get more out of it if the BCLK frequency was higher and the multiplier was lower.
Even if the top speed was lower.

I'm running a i5 760 @ 19M 200F for 3.8.

 

[essenbe]

Spec on the ram is 9-10-9-28 do you think I should try to lower them?

 

[Lordbob75]

I thinking you will get more out of it if the BCLK frequency was higher and the multiplier was lower.
Even if the top speed was lower.

I'm running a i5 760 @ 19M 200F for 3.8.

It is the other way around with the 2x00k CPUs. You pretty much have to leave the BLK frequency as is, but you can pump the clock multiplier up over 50 without much trouble.

~Lordbob

 

[Kipper]

ASUS did a test of 100 binned D2 2600K CPUs and tested for stability under load; these results will most likely represent retail CPUs.

1. Approximately 50% of CPUs can go up to 4.4~4.5 GHz
2. Approximately 40% of CPUs can go up to 4.6~4.7 GHz
3. Approximately 10% of CPUs can go up to 4.8~5 GHz (50+ multipliers are about 2% of this group)

 

[Lordbob75]

ASUS did a test of 100 binned D2 2600K CPUs and tested for stability under load; these results will most likely represent retail CPUs.

1. Approximately 50% of CPUs can go up to 4.4~4.5 GHz
2. Approximately 40% of CPUs can go up to 4.6~4.7 GHz
3. Approximately 10% of CPUs can go up to 4.8~5 GHz (50+ multipliers are about 2% of this group)

I remember this test. My CPU can hit 5Ghz, but only at 1.5V, which was a tad scary. Not sure if they included bumping voltage in this or not though.

~Lordbob

 

[Kipper]

1.5 for 24-7 operations is really scary and will really shorten the life of your processor.

I find that my two 2600Ks running on the Fatal1ty, the P8P67 Pro and Deluxe boards are pretty much in line with the study ASUS did.

FROM: ASUS

K series overclocking and voltage range recommendations

Quick Note regarding Voltage Scaling – Internal binning of both D1 and D2 parts we discovered consistent voltage scaling patterns.

1. For K series parts, the stock voltage supplied will allow for consistent overclocking generally up to a multiplier of 43x. There is potential for the multi to be raised to 44x depending on the load induced. This default voltage range be approx 1.240 to 1.260 under load.

2. Increased range between 44 to 47x multipliers will generally require a voltage range between 1.30 to 1.375V with an LLC recommended setting of high to ultra high.

3. Increasing the range between 48 to 50x multiplier will generally require a voltage range between 1.40 to 1.500 with a LLC recommended setting of ultra high.

4. Increased range between 50 to 52 (52 generally considered peak max multiplier except for rare 54x parts) will generally require a CPU voltage range between 1.515 to 1.535V with LLC at Ultra High and potential fine adjustments to the CPU skew range.

Overall a key item to note is the best voltage to oc scaling range potential for the turbo multiplier is 1.400 to 1.425 vcore. Using this voltage range with an LLC recommendation of ultra high will generally provide the best scaling potential with proper load temperatures*.

We have generally found exceeding this voltage will not provide additional scaling or will increase load temperatures to a high level with synthetic load applications ( like Prime, Linx, OCCT ). Should you use more realistic loading testing (our recommendation is a combination of AIDA64 stress test, PC Mark Vantage) then temperatures under will be considerably under the max TDP rating.

 

[paulpicks21]

My 2600k requires 1.46vcore to be stable at 5ghz.

However for my daily oc it runs at 4.6ghz at 1.36vcore.

Paul.

 

[essenbe]

I was not trying to see how fast I could oc it, I just wanted a moderate OC with stock voltages. All voltages were set to auto. I stated with default settings, put sata on ahci, enabled XMP for ram and set manuf. rated freq. and timings and increased the multiplier to 42. Everything else was set to auto.

 

[simmo]

Personally I'd have aftermarket cooling on that but otherwise looks fine to me...if you tighten up your RAM timings you may have to use 2T instead of what you have now 1T...isn't there multiple profiles for XMP ram? If there is you could use other profiles and see if there is any performance benefit..

And btw 1 hour of Prime doesn't mean it's stable...run it overnight and see what happens

 

[essenbe]

Tou can set your own profile and frequency under XMP. I haven't done it, I'm running manuf. specs. I have a Corsair H50 with 2 Noctua fans (which I have my doubts about). I idle at 36 which I think is too high. I don't know if it qualifies as a stress test but, I have been running folding@home which runs the CPU at 100%. I have left it running for 4 days continuously and the highest temp I have seen is 61C. (tjmax is 98). CoreV usually runs between 1.288-1.3 at my settings.

 

[simmo]

You can add a res to the H50/60/70...google it...easy as and drops temps a bit more.
I added a single bay res,in hindsight shoulda been a dual for better results..I run Noctua fans on mine also and run climate net 24/7 and at times have crysis2 running simaltaneously.
If foldings not crashing that would do me for a stability test lol.
I would'nt bother with ram speed..tho you could disable it and see what gets set with as stock/default.
My understanding is loose timings etc are to enable higher O/C's so default settings could in fact be a little tighter and at 1T to boot.
cheers

 

[essenbe]

At defaultt XML the timings are the same, they just reduce the frequency to 1600. Also I think I forgot to mention that I am running at 4.4 right now.

 

[simmo]

well if default is 2T then try setting it to run 1T timing and see if it boots.