FCLK 1GHz on Coffee Lake

Vario · Nov 14, 2018

Are there any long term issues with running FCLK (System Agent) at 1GHz instead of default 800 MHz? My understanding is it provides slight performance improvement for discrete videocard performance with no downside and that prior Intel ran at 1GHz but from Sky Lake on, the FCLCK was set to only 800.

infrared · Nov 14, 2018

I've had it set to 1Ghz on my 6700k permanently since buying it, no issues so far.

Vario · Nov 15, 2018

infrared said:
I've had it set to 1Ghz on my 6700k permanently since buying it, no issues so far.

Did you need any additional VCCSA voltage?

jboydgolfer · Nov 15, 2018

My 8600k has been on 100 since i built it

FireFox · Nov 15, 2018

Vario said:
from Sky Lake on, the FCLCK was set to only 800.

Some people claim that 800 is the max, mine is and has always been at 1GHz, i don't even look that setting.

Woomack · Nov 16, 2018

1GHz works at low bclk, once you start setting higher bclk then you will see instability or PC won't boot at all. There is some range of working frequency. This is also why there is 800MHz and 400MHz option on overclocking series motherboards. Typical is 800MHz.
On Coffee Lake SA voltage can stay at default at lower memory clock. You will need to set it higher at above 3200 but it depends on the IMC.

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Processor	Intel i9-12900KS: 50x Pcore multi @ 1.18Vcore (target 1.275V -100mv offset)
Motherboard	EVGA Z690 Classified
Cooling	Noctua NH-D15S, 2xThermalRight TY-143, 4xNoctua NF-A12x25,3xNF-A12x15, 2xAquacomputer Splitty9Active
Memory	G-Skill Trident Z5 (32GB) DDR5-6000 C36 F5-6000J3636F16GX2-TZ5RK
Video Card(s)	ASUS PROART RTX 4070 Ti-Super OC 16GB, 2670MHz, 0.93V
Storage	1x Samsung 970 Pro 512GB NVMe (OS), 2x Samsung 970 Evo Plus 2TB (data), ASUS BW-16D1HT (BluRay)
Display(s)	Dell S3220DGF 32" 2560x1440 165Hz Primary, Dell P2017H 19.5" 1600x900 Secondary, Ergotron LX arms.
Case	Lian Li O11 Air Mini
Audio Device(s)	Audiotechnica ATR2100X-USB, El Gato Wave XLR Mic Preamp, ATH M50X Headphones, Behringer 302USB Mixer
Power Supply	Super Flower Leadex Platinum SE 1000W 80+ Platinum White, MODDIY 12VHPWR Cable
Mouse	Zowie EC3-C
Keyboard	Vortex Multix 87 Winter TKL (Gateron G Pro Yellow)
Software	Win 10 LTSC 21H2

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FCLK 1GHz on Coffee Lake

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infrared

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FireFox

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