Question overclocking my i7 8700k to 4.9Ghz at 1.27v is it stable?

[Afro_ninja199]

PC Specs
Antec Prizm 120mm RGB PWM Case Fan
4 TB WD Blue Hard Drive 3.5" HDD 7200 RPM
1TB samsung 970 EVO plus
2 x 8GB G.SKILL Trident Z RGB 3000Mhz DDR4 Ram
240GB Apacer AS340 2.5" SATAIII SSD - 505MB/s Read and 410MB/s Write
800W Be Quiet! Straight Power 10 CM
Gigabyte GA-Z370-AORUS ULTRA GAMING ATX LGA1151v2 Motherboard
In-Win 303 Mid Tower Case - White
Intel Coffee Lake Core i7 8700K Unlocked 6-Core CPU
Thermaltake: Floe Riing -360 RGB TT Premium Edition
EVGA GeForce GTX 1080 Ti SC Black Edition

have overclocked to 4.9Ghz at 1.27v it seems stable can game all day ( destiny 2, fortnite, borderlands 3, also watch twitch etc on a 2nd screen ) while gaming temp sits on avg 55c which to me seems good, but i was told that for the overclock to be truly be stable it needs to run prime95 for 2 - 4 hours, 10- 15min into prime95 running and temps go up to 90c is this normal? i understand prime95 is meant to be hard on ya cpu but should it hit 90c so fast?

cheers for any feed back

 

[vMax]

We have a very similar setup with my 8700K at 4.9GHz with 1.278v...As to stability I personally would not worry about the 2 to 4 hour time frame as all the primary games and programmes you are running are working fine. I did a lengthy Prime95 run of nearly 3 hours on version 26.6 and an Aida64 run to double check on stability but 30 minutes should be enough to see whether there is any instability...

I should have mentioned that temps can reach 90 degrees on the Prime95 small FFT test dependant on CPU cooler and you have a good cooler so I expect it should be a bit less. I finally took the plunge to delid my 8700K and my temps even with small FFT's never tops 70 degrees but based on what you are doing, your numbers are actually fine for gaming all day long.... be happy.

 

[Afro_ninja199]

We have a very similar setup with my 8700K at 4.9GHz with 1.278v...As to stability I personally would not worry about the 2 to 4 hour time frame as all the primary games and programmes you are running are working fine. I did a lengthy Prime95 run of nearly 3 hours on version 26.6 and an Aida64 run to double check on stability but 30 minutes should be enough to see whether there is any instability...

So i should leave it running for 30min even if it stats at 90c?

 

[vMax]

Yep it should be fine though with your 360 cooler hopefully it should be in the 80's. I personally do not like being in the 90's for any length of time...

 

[vMax]

I would say as you are stable across all games, I personally would not worry to much. Just check with the Prime95 blend test for 30 minutes, Intel Burn for a couple of runs....

 

[Afro_ninja199]

Yeah wasnt to happy when it hit 90 lol might look at replacing the paste

 

[vMax]

Yeah wasnt to happy when it hit 90 lol might look at replacing the paste

Just to clear the temps up. 100 Degreec C is TJ MAx and at that point the 8700K will downclock. As I said, I personally would not worry unless you are after overclocking records...So long as it is running everything with stability and at a good temp, you are fine.

Edit 04 Oct - thank you for the edit on the TJ Max to 100 Degrees C...whoever did that, it is appreciated...

 

[Afro_ninja199]

cpu is only hitting 55c 60 at max while gaming etc so im happy, thank you guys for the info