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i3-550 Overclocking

post #1 of 6
Thread Starter 
Hey all.

I just received my EVGA P55 Micro, and now, i want to OC my i3-550.

My processor is stepping K0, and batch 3046A2244.

I'm a little noob to OCing CPU's in general, and having a mobo that failed at OCing wasn't a big help (like the one on my HTPC), plus OCing a C2D is different than OCing a clarkdale, at least seems like it.

I've taken down all the info that can be modified on my mobo for OCing, and their settings at stock speeds. List goes as follows:
Overclocking Info (Click to show)
Code:
- Multiplier (24)
- Skew Control (0ps)
- Clockgen Switch (Disable)
- CPU Freq Setting (Auto)
- PCIE Freq (100)
- QPI Freq  (Auto)
- Extreme Cooling (Disabled)
- Vdroop control (Active)
- Bootup CPU Vcore (Auto)
- Eventual CPU Vcore (Auto)
- DIMM Volts (Auto)
- Bootup CPU VTT (Auto)
- Eventual CPU VTT (Auto)
- PCH (Auto)
- CPU PLL (Auto)
Also, the volts as they're shown on the BIOS, also stock speeds:
Volts (Click to show)
Code:
-Vcore: 1.25625v
- DIMM Volts: 1.50v
- VTT: 1.050v
- PCH: 1.050v
-CPU PLL: 1.800v

I also want to turn off all power-saving features, but the only ones i know are C1E and SpeedStep, and this mobo presents me a lot of others that are new to me. Power Saving (Click to show)
Code:
- C-State Tech
- C3 State
- C6 State
- C1 Auto Demotion
- C3 Auto Demotion
- Cstat Package Limit Setting
- SpeedStep (Off)
- C1E (Off)

The temps i see with my H50 are 30°c on idle, and 55°c on full prime load (4 workers) on stock clocks, using RealTemp. I want to leave HT on since i plan to BOINC on the CPU. I've also read the Clarkdale Overclocking guide but i see not a lot of help on how to set up the volts. I also know my RAM supports up to 1600 MHz (9-9-9-24) with 1.57v, according to the guy who sold it to me.

So far i've gotten a semi-stable OC (semi IMO because it boots into windows and behaves correctly while on light load and even ran prime95 for 30 mins and no errors, but haven't tried full blown stress testing) of 4.32 GHz. BCLK is 180 MHz, Multi is x24, QPI is 4266 GT/S, and RAM runs at 1440 GHz. Volts are 1.35v Vcore, 1.35v VTT, 1.55v RAM, 1.1v PCH and 1.85v PLL, while getting a temp of 35-40°c on idle, and 70-72c on full load; but i have one issue with it. When i turn the PC on, the pc loads, but after 5 seconds, it turns off by itself, like a POST failure. Then, after 10 seconds, turns on again, and POSTs correctly, loads windows and all. But, at stock speeds, when i turn it on, it just powers on correctly.

I also want a 4.5GHz+ overclock. My "perfect" overclock, if i can attain it, is 4.8 GHz (200x24, or any other variant). I also plan to get a 24/7 stable OC. But, i need a little help with volts to achieve this OC. I do know the max vcore is 1.4v, but i've seen 4.5 GHz clocks with like 1.36v, but on other i3s's, like a 530.
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post #2 of 6
Thread Starter 
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post #3 of 6
A lot to cover lol.

I guess I'll start by saying not all chips are equal, just because somebody else has managed a high OC with low voltage doesn't mean you'll be able to.

That said, it looks like you have a good overclock apart from that posting error...

That is a bit suspect.


I think your best way forward is to spend some time learning your system, those voltages could be tuned down a little I reckon (though maybe not).

Did you need the extra PLL voltage for example? and is the FSB still stable on less volts?



Also, I should point out, with your temps as they are, I don't think you'll see 4.5, def not 4.8.
    
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by Crabid 
I guess I'll start by saying not all chips are equal, just because somebody else has managed a high OC with low voltage doesn't mean you'll be able to.
A sad truth. I know this because of my video cards. One starts artifacting if i push it above 880 MHz core no matter what the volts are, and other can go real fine @ 980 MHz core with just a lil bit more juice. The third goes to the middle, @ 935 MHz core being it's roof.
Quote:
Originally Posted by Crabid 
That said, it looks like you have a good overclock apart from that posting error...

That is a bit suspect.

I think your best way forward is to spend some time learning your system, those voltages could be tuned down a little I reckon (though maybe not).

Did you need the extra PLL voltage for example? and is the FSB still stable on less volts?
Think this might be because i'm overvolting something? I just bumped the volts a notch just for windows to boot and all stuff to run, but i'll start lowering them to try stability and lower my temps, might even get at least to 4.4 GHz.
Quote:
Originally Posted by Crabid 
Also, I should point out, with your temps as they are, I don't think you'll see 4.5, def not 4.8.
Thought so. Sucks to be an OCing enthusiast in the tropic, where it's hot all year long frown.gif
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post #5 of 6
QPI seems really high for 180 BCLK... but I never clocked p55. My 920 crapped out right around there, and I was pushing 240.
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post #6 of 6
That guide tells you exactly what to do with the volts. If it doesn't mention something, you don't need to touch it.

Start over and get 200 BCLK stable so you have greater control with the multi. If you want 4.5, 205*22. I doubt you will get it with those temps though. Read up on what each setting does, and see what they are compared to the guides terminology.

If your memory is not 1600, then run it closer to stock.

I think my settings are:
vcore - 1.325
VTT/QPI - 1.21
BLCK - 200
Multi - 22
PCH - stock
PLL - stock
QPI Frequency - 4Ghz

I run my memory at 1600 because it is rated for that. The clarkdales have weak IMC compared to their other ix counterparts, so it can be harder to overclock memory. To run your memory at 1600(or close to it), you need 1.65v.

I would lower the DRAM multi so it runs at 1200 with a 200 BLCK and see if you can get it stable. You will not notice a difference between that and 1600, I have tried on this system and you can run with stock dram voltage. At 1200 you could probably do 7-7-7-18/20-1t.
Edited by Horsemama1956 - 5/9/11 at 6:44am
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