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2500k won't clock past 4.3

post #1 of 26
Thread Starter 
I'm not sure if I should post this in CPU or Motherboard because I'm not sure what the issue is,
but here goes.
(If you want to skip back story, just skip down to "Overclocking")

I think I may have shot myself in the foot here when I put together my latest system.

My AM2 system that I miraculously kept alive for the last 5 years finally died last month. I told the wife I could get it back up and running for around $400 by recycling parts and just replacing the motherboard/cpu/memory.

ANYWAY, budget was around $400 so I decided on the 2500k right away and built off of that. Well $224 only left me with $176...not a whole lot of head room. So the motherboard I picked up was a budget P67 board.

MSI P67A-C43 for $119, that and the memory put me a tad over $400.


"Overclocking"

Knowing that it was a budget board, I wasn't looking for 5Ghz or anything, I would have been completely satisfied with 4.6...even 4.5.

OC Genie clocks the cpu to 4.2 at like 1.24v but also bumps the ram voltage to 1.654.

Obviously I decided to manually tune the settings thinking that since it will do 4.2 on such low voltage I should easily be able to get it to 4.6.

Apparently I was wrong, reading everything I could on overclocking the 2500k, I start playing with the settings. Left everything default and started the multiplier at 4.6...bsod. I backed it off by one until it was stable at 4.2 again.

Started moving the voltage up with the same results. I eventually had the voltage at 1.35 and it still will not clock past 4.2...almost stable at 4.3.

I did notice that there is no way to change the PLL voltage on this MB, there is only PLL Overvoltage(Auto, Disbaled, Enabled).

The control center that is installed with the MB drivers has the option to change the cpu voltage up to 1.6 but even setting it as high as 1.4 doesn't seem to stabilize no matter what I do.

I get that it was a bad choice to go with a budget MB, if I had more time to wait I could have spent an extra $80 to pick up a decent board. However, being without a computer for another month was just not an option for both work and recreation

I guess my main question is, am I just SOL until I can drop $200 on a new MB(if it is indeed the MB), or is there anything else I can try?
post #2 of 26
Well you should flash to the latest bios for your board and see if it helps overclocking and/or unlocks more bios options. I would also increase VCCIO voltage a couple bumps to see if that helps.

Also, there is no need to spend a ton of money on a great board. Not sure what you paid, but the retail price on Newegg for the MSI P67A-C43 is $119.99. If you were to spend an extra $20, you could've bought a true enthusiast board- the Biostar TP67XE which wouldn't put up a fight overclocking. I would also be a little leery attempting to overclock on an 5 phase MSI motherboard without any VRM heatsinks too... But you should probably be okay if you're under 5ghz or so and have a good bit of airflow up around the VRMs (to the left and top of the CPU socket, near the little black squares).

edit: oh yea and fill out your full system specifications in the User CP at the top of the page.
Edited by Dopamin3 - 4/20/11 at 9:16am
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post #3 of 26
Thread Starter 
Sorry about the specs.

I've definitely got plenty of air moving into and out of the case, especially around the VRMs, it's like a little wind tunnel there. Plus, as you stated I won't be going over 5, I'll be happy with 4.5/4.6.

$120 was what i paid for my MSI board from newegg, and I don't know if I ever saw the Biostar board there. Though I've never used biostar before and it not having any reviews may have caused me to overlook it :/

I'm running version 1.9 of the bios, though it looks like they just came out with a v1A. it doesn't list any major updates to options. I'll check to see if my limited bios options allows me to change the VCCIO/CPU I/O and see what that does.
post #4 of 26
Another note, Clunk has a good guide for P67 overclocking you might want to check out.

Also I think on some P67 boards you need to override some sort of TDP setting in the bios, that could be what's holding you back.
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post #5 of 26
Like Dopamin3 mentioned, you might want to look for some type of TDP or "Current Capability" settings.. I've never had an MSI board, so I don't know what kind of options you have, but it could be worth a look. Most overclocking guides suggest that one of these values be increased. On the ASUS boards it is usually set to 130%.

Since this MSI board apparently does not have a good VRM (when compared to the P8P67/P67A boards), I am sorry to say that you very well may be SOL. The ASUS boards really do have an incredible amount of settings in the BIOS, and plenty of people have done 5GHz with the base P8P67, which can be had for around $150... it might be worth getting rid of the MSI and grabbing one of these. ($145 at Frys actually)

One last thing: PLL Overvoltage should not be necessary at these clock rates. Only enable it if you cannot boot with your current settings. There are times when it hurts more than it helps.
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post #6 of 26
I ran into the same issue.

I turned on internal CPU PLL and that fixed my issue. I don't know what that setting would be called on an MSI board however.
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post #7 of 26
Thread Starter 
Thanks all,

I'm on my way home from work and will dig into the BIOS when I get there to see if there is any possibility to squeeze anymore juice out of it. I've only had it for about a week, maybe I'll check to see if I can get credit at newegg towards another board if I send it back. Otherwise I'll just have to bite the bullet and spend $150 on a new board and see if I can sell this one to recover at least half the cost of the new board or something.

I'll let you know what I find out in all aspects later on tonight.
post #8 of 26
Do you have an option to enable LLC? (Load Line Calibration) Give that a try if you do. I have to enable that on mine to get a stable overclock for anything over 4ghz.
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post #9 of 26
Thread Starter 
I think I'm just out of luck until I get a new board...which sucks since it's just money down the drain....sort of, I mean it does work up to 4.3 for now. I've attached screen shots of the overclock menu and the sub cpu features menu....as you can see, there's nothing there.

What really gets me is I see people running the 2500k at sub 1.3v and I can push my voltage up to 1.35 in bios or 1.5+ in the control center in windows yet I can't get stable over 4.3...and I'm lucky to get that.

post #10 of 26
Set the following:
  1. Spread Spectrum - disabled
  2. Vdroop Control - no vdroop (or disable, whatever setting is called)
  3. OverSpeed Protection - disabled
  4. Long duration power limit - as high as you can set it

You may also have to set Primary plane turbo power limit to a really high value, I'm not sure if 0 means no limit or what MSI is doing with that setting. You will also probably need to adjust the 4-Core Ratio Limit to whatever you want your CPU multiplier to be (e.g. 40 if you want to run 4ghz, 45 if you want 4.5ghz etc...) Take your DRAM Timing Mode of Auto and manually set it to what your kit is rated at too.

This should fix your problem. No need to buy a new board really, you're just overlooking some important bios options that need changed.
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