Adviceoverclocking- have I done it properly?Posted:

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(i5 3570K default 3.4Gz)

I followed an old magazine article that told me to go into BIOS and change the FSB speed for intel chips.

My BIOS there isn't a FSB setting but there is a BCLK/PEG frequency, I see BCLK is base clock but I don't know what PEG means.

The default for this is 100Mhz and the range is 80-300. First I tried uppping it to 125 but it failed and refused to boot. Next I tried 110 again failed. next I tried just 105 and my computer seemed to boot quicker.

There are also voltage settings but I don't really know what to do with them. If I wanted to try say 110 BCLK would I need to up the voltage?

So I have a program I wrote myself in python which caculates a factorial and times how long it takes to calculate it. Before overclocking it took 69.7s to calculate 250! but now it takes 65.6s.

Does this mean I have successfully overclocked my CPU and made it faster? I'm a little excited because I've known about overclocking for years but never been brave enough to try it.

My core temperatures are fine just now (between 30 and 40C) but I will run Prime95 and make sure they don't overheat.
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Okay, so PEG is probably referring to the integrated graphics, but it doesn't matter, it's not relevant to you.

If you upped the BCLK to 125 immediately, I find it hard to belive you done very much reading before overclocking. The 3570k will have a multiplier of 34, 34x100= 3.4GHz. Upping the BCLK to 125 straight away is near enough a 1GHz overclock, without touching voltage or multiplier apparently? That's far too much. It makes sense that you wouldn't put at a BLCK of 125, or 110.

First thing I usually do is find out how much voltage the CPU will be comfortable with, then dial it back a bit and find a multiplier that works with the given voltage, then you can tart to tweak BCLK if you wish, but BCLK overclocking will overclock your RAM as well.

But yes, upping the BCLK from 100 to 105 is an overclock. Whether it was successful or not is another story, the system might not be stable under load. 105 on the BCLK is only an OC to like 3.6GHz though which is lower than the turbo speed of a 3570k AFAIK, so that would be fine at stock voltage unless you had a really shitty chip.
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Thanks for the feedback. I am trying to learn and I'm doing this for the experience as well as a performance increase.

I ran Prime95 for a while with the chip overclocked and the core temperatures went no higher than 80C.

So what I should try now is increase the voltage slightly and check the CPU is comfortable with it? But how would I know either way?
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80c is pretty hot. With Intel CPUs, I like to stay in the 80c range under load, although anything less than 95-100c is technically safe since TJ Maxx is 105c.

If you're at 80c under load, I'd probably leave voltage where it is as increasing voltage increases the temperature. You need more voltage to sustain a higher stable overclock.

Set the BCLK back to 100, and up the multiplier. I'd start at 37(3.7GHz) since that's the turbo clock speed on the 3570k. Run Prime95 for 10 or so minutes to check stability. If you're stable, up the multiplier. I'd probably only add 100MHz at a time. Again, Prime95 to check stability and remember to always keep an eye on temperatures. When the clock speed is unstable, it's time to add voltage but if your CPU is getting too hot to add more voltage, you'll have to dial back to whatever clock speed you were stable at.

After that is when I'd start to tweak BCLK as this affects CPU+RAM speed.
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When I had a 3570k I was able to get 4.5ghz out of it safely with only a hyper 212 evo, I didn't even need to touch BCLK, Voltage wise I didn't go above 1.3.
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Under Prime95 load 80C is the highest temp reached by any core. The temps were floating between 70 and 80.

Normal usage before and after overclocking the temperatures float between about 28 and 40.

I'm probably overlooking something really obvious, but I can't seem to find the multiplier setting in BIOS is it any of these? see pic

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Change your Turbo ratio to manual then you should be able to enter in the multiplier .

Turbo Ratio:

Options are "Auto", "By All Cores" and "By Per Core". A description of these settings is provided in the right-hand column of the UEFI BIOS and can be seen when the Turbo Ratio setting is selected.

By All Cores: This sets the CPU core frequency multiplier; multiplied by BCLK to give the target CPU frequency (under full load conditions if SpeedStep is active). "Auto" = stock CPU multiplier Ratio used. Manual numerical entry of the desired Turbo Ratio is accepted. *

Per Core: Allows setting the maximum Turbo multiplier of each physical processor core.*

*The available multiplier range is limited by both processor model and the ability of each CPU.


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So I set the BCLK back to 100 and upped the multiplier from 34 to 39.

System and temperatures seem stable enough, is there any need to alter the voltage or is it really as simple as upping the multiplier? I could try higher numbers but how would I know if the CPU needs more voltage?
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buildafire wroteSo I set the BCLK back to 100 and upped the multiplier from 34 to 39.

System and temperatures seem stable enough, is there any need to alter the voltage or is it really as simple as upping the multiplier? I could try higher numbers but how would I know if the CPU needs more voltage?

Like I said, you need more voltage to remain stable at higher clocks. So, if you're stable at 3.9GHz, you don't need more voltage. If you up the multiplier and become unstable, you'd want to add voltage as long as your CPU isn't already getting too hot.

If you wanted to leave it at 3.9GHz, you could. That's still an overclock since the 3570k won't boost higher than 3.8GHz.
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