Assistance with i5-2500K overclocking

[Modus]

before I start;
i5-2500K
P8P67 Pro
XMS3 2x2GB DDR3-1600

Alright so I've followed this guide
Official ASUS P8P67 Series Overclocking Guide and Information - XtremeSystems Forums

but the problem is they are attempting 4.8ghz which I'm not going for, 4ghz is fine with me espcially sinc I'm using the stock cooler.

I tried it out still and tried to stick with 40x multipler but I've run into a few problems.

My cpu frequency seems to change when at idle and in use. I know i disabled something in the bios with my old E8400 rig but I'm not sure what it was and if its the same for P67.

[ilya]

Power savings features will lower clock speeds.
C states, (C3, C6, etc) speedstep, E1ST, etc.

You should have them all disabled when you're testing for stability. I would enable them after as they do give some fairly good power savings.

[Xelfer301]

can we see your stats on cpu-z and realtemp with by screenshot because, im using the same board and just finish overclocking to 4.5 and about to reach higher, you could also use this guide they are also using the p8p67 mobo.

P67 Sandy Bridge Overclocking Guide For Beginners

[enaberif]

Only thing you need to do .. bump your cpu voltage to like 1.3 and your ram to 1.6 and give er.

Its all I did to clock a 2600k to 4.5ghz

[kingnubian]

With the 1155 socket P67 chipset, power saving states will for the most part not affect your ability to overclock. I thought they would but have a read of Official Asus P8P67 Overclocking guide, Official ASUS P8P67 Series Overclocking Guide and Information - XtremeSystems Forums, it was stated otherwise and in practice I have seen this to be true.
I followed the recommendations and now have a stable 4.8Ghz overclock with speedstep & C1 enabled with lower temps on my setup in listed in my sig then my last few blind attempts.

I would not recommend overclocking past 4-4.4ghz with stock cooling at all. The Coolermaster Hyper 212+ was used in that guide btw. The new socket 1155 series cpu's will thermal throttle down when close to reaching their TJ Max (~98c) and with the speedstep & other power saving features enabled also throttle down when idle or with light use. I can't remember if I disable Turbo though & will have to check.

As for Ram voltage, since you memory speeds will not vary & run at stock, unless you intentionally set it that way to overclock your memory from their rated speed, leaving the default voltage (1.5V) or whatever the recommended factory setting is will be ok. I don't see the advantage of running your memory at higher than the manufacturer recommended voltage unless you plan on running higher than spec'd speed (overclocked).

Again to achieve 4.8Ghz I have most of the power saving features enabled, vCore at 1.4v (Will try lower 1.38v since 4.6ghz was 100% stable at 1.32v). I have also followed most of the recommendations in the Asus guide.

The socket 1155 overclocking experience has been very different then my socket 775, AM3 or even S1366 experiences. I've had to approach S1155 overclocking with an open mind and a blank slate. It's a blast! I will attempt 5Ghz later this week.

[wedge22]

I am also just experimenting with overclocking the i2500k on a ASUS P8P67Pro, I used the AI Suite tool Auto Tuning and my CPU maxed out at 4944Mhz, it looks like the voltage is only 1.2Vcore so thats not an issue. My issue appears to be the very high temperatures my CPU is hitting, up to 93C using Realtemp monitor. I am obviously a little concerned. I have a HAF 932 Black case and I am using an ECO ALC cooler, not sure why the temps are so high.
If I let Auto Tuning just overclock to 4.4Ghz then my temps hit about 66C which is not so bad.

[francisw19]

Originally Posted by wedge22

I am also just experimenting with overclocking the i2500k on a ASUS P8P67Pro, I used the AI Suite tool Auto Tuning and my CPU maxed out at 4944Mhz, it looks like the voltage is only 1.2Vcore so thats not an issue. My issue appears to be the very high temperatures my CPU is hitting, up to 93C using Realtemp monitor. I am obviously a little concerned. I have a HAF 932 Black case and I am using an ECO ALC cooler, not sure why the temps are so high.
If I let Auto Tuning just overclock to 4.4Ghz then my temps hit about 66C which is not so bad.

Have you checked that your cooler is properly seated?

For reference, my D14 keeps my 2500k at 50°C when running Prime95 at 4.4GHz w/ 1.30 Vcore. The D14 is one of the better coolers on the market...but I'm not sure how it matches up to the ECO ALC. I suspect the D14 is a better performer, but I don't know by how much.

[wedge22]

The cooler was recently installed and all the screws are tight so it should have even coverage as it has a backplate, I will double check it tonight. I am not entirely convinced that the ECO ALC is really that great, maybe I should upgrade to a Noctua heatsink.

[francisw19]

Yeah...fair enough. I'm not too convinced with the pre-built water coolers. The only downside about the D14 is that it's one big mofo heatsink. But, if you can fit it in your case and you got the cash, I can certainly vouch for it. It'll keep your CPU nice and frosty.