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9900K OC help (System Agent & VCCIO)

 
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post #1 of 10 (permalink) Old 09-02-2019, 03:44 PM - Thread Starter
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9900K OC help (System Agent & VCCIO)

Hello there,

I've been overlocking my 9900K for a day now and got the following results:

4.8 GHz @ 1.225 volts stable with Prime 95 12k
4.9 GHz @ 1.29 volts stable with Prime 95 12k

I'm on a Gigabyte Designare Z390 with good VRM and run it in Turbo LLC.

Can I possibly get the 4.9 GHz at a lower voltage by decreasing System Agent and VCCIO, both currently at 1.3 and 1.2 volts?

Is it maybe better to run Prime with 1344k like der b8uer tests his samples which he sells on caseking? That'd make my overclock range less narrow than with 12k.

My cooler is a Noctua NH-U12A
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post #2 of 10 (permalink) Old 09-02-2019, 04:35 PM
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Quote: Originally Posted by Melodist View Post
Hello there,

I've been overlocking my 9900K for a day now and got the following results:

4.8 GHz @ 1.225 volts stable with Prime 95 12k
4.9 GHz @ 1.29 volts stable with Prime 95 12k

I'm on a Gigabyte Designare Z390 with good VRM and run it in Turbo LLC.

Can I possibly get the 4.9 GHz at a lower voltage by decreasing System Agent and VCCIO, both currently at 1.3 and 1.2 volts?

Is it maybe better to run Prime with 1344k like der b8uer tests his samples which he sells on caseking? That'd make my overclock range less narrow than with 12k.

My cooler is a Noctua NH-U12A
VCCIO 1.10 and VCCSA 1.20 is good for RAM > 3200 mhz. These being too low can cause some stability problems.
Only other way to reduce the voltage is to lower your loadline calibration and raise the bios voltage.

Most stable voltages happen from using Normal/Standard Loadline calibration (or LLC1 or LLC2) and use Auto vcore, and reduce the "AC Loadline" value to lower the voltages (idle and load) that way.

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post #3 of 10 (permalink) Old 09-02-2019, 04:48 PM - Thread Starter
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Quote: Originally Posted by Falkentyne View Post
VCCIO 1.10 and VCCSA 1.20 is good for RAM > 3200 mhz. These being too low can cause some stability problems.
Only other way to reduce the voltage is to lower your loadline calibration and raise the bios voltage.

Most stable voltages happen from using Normal/Standard Loadline calibration (or LLC1 or LLC2) and use Auto vcore, and reduce the "AC Loadline" value to lower the voltages (idle and load) that way.


Does VCCIO 1.10 and VCCSA 1.20 affect my overclock and maybe allow me to run lower voltages with my CPU?

You're not recommending me auto vcore do you? That's horrible xD Dude, my CPU runs stock with 1.25 to 1.27 volts stock 4.7 GHz while I can get it manually to 4.8 GHz at 1.225 :> Who'd run it stock with a much higher voltage and temps if I can get it down.

Right now I'm trying to figure out how low I can get 4.9 GHz, my record has been 1.275 volts with 12k FFT. I've just been wondering if lowered VCCIO and VCCSA will allow me to go even lower.

Last edited by Melodist; 09-02-2019 at 04:53 PM.
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post #4 of 10 (permalink) Old 09-02-2019, 04:53 PM
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if you're temp limited, maybe, but probably not at any meaningful amount.

but 1.3v VCCIO/SA is unneeded, you should lower it anyway. I only need 1.23v for 4133.

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post #5 of 10 (permalink) Old 09-02-2019, 05:02 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post
if you're temp limited, maybe, but probably not at any meaningful amount.

but 1.3v VCCIO/SA is unneeded, you should lower it anyway. I only need 1.23v for 4133.
Does lowering VCCIO/SA allow me to run lower vcores? My best value for 4.9 GHz currently is 1.28 volts and 1.225 for 4.8 GHz. I'm using trident z cl 14 3200 MHz b-die.

How will I know VCCIO/SA is stable? Same as vcore = crash?
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post #6 of 10 (permalink) Old 09-02-2019, 05:11 PM
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How about checking that empirically, it's be thousand times faster... SA/IO is 99% use case of RAM overclocking, not Core.

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post #7 of 10 (permalink) Old 09-02-2019, 05:15 PM
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SA specifically can limit your RAM OCs if it's too low but shouldn't have anything to do with your CPU voltage. VCCIO shouldn't either.

Intel i9 9900K Coffee Lake @ X8 5309mhz (+47.5%)
AMD FX-8320 Vishera @ X4 5022mhz (+43.5%)
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post #8 of 10 (permalink) Old 09-02-2019, 05:21 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post
SA specifically can limit your RAM OCs if it's too low but shouldn't have anything to do with your CPU voltage. VCCIO shouldn't either.
So lowering them will not affect my CPU OC?
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post #9 of 10 (permalink) Old 09-02-2019, 05:35 PM - Thread Starter
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I've lowered them now to 1.15 and 1.2 after having read your posts anyways

Okay so they do affect my OC capabilites, I was able to lower the vcore further after having lowered them.

Last edited by Melodist; 09-02-2019 at 05:48 PM.
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post #10 of 10 (permalink) Old 09-05-2019, 02:00 AM - Thread Starter
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Quote: Originally Posted by The Pook View Post
if you're temp limited, maybe, but probably not at any meaningful amount.

but 1.3v VCCIO/SA is unneeded, you should lower it anyway. I only need 1.23v for 4133.
What should I use for Trident Z Pc3200 CL14?
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