8700K/Hero X/8 Pack RAM XMP & VCCIO/VCCSA Voltage Help?!!

C6ckneyGeezer · 8 Jun 2018 at 17:12

Hi all I currently have a i7-8700k @ 4.8Ghz Delided, Asus ROG Maximus X Hero and 16GB TG Dark Pro "8 Pack Edition" @ 3200Mhz XMP. CPU I am running a manual Vcore of 1.265v and LLC Level 6, which gives me 1.280v under full load. The ram I have XMP enabled.

The issue I have is while XMP is on, the voltage for VCCIO is set to 1.328v and VCCSA is set to 1.136v. The VCCIO seems veeerrryy high? VCCSA not so much. I read in many places that anything above 1.25v is very high, 1.3v being critical and on the edge. Why have these been set so high when XMP is turned on? Hope ive done no damage in leaving these on auto??

I have set them both to 1.1v for now! Done a lot of stress and mem testing, all seems stable. All my idle voltages are as follows, are these all ok?

ViRuS2k · 8 Jun 2018 at 19:36

There set high by the motherboard vendors as to make it much easier for compatibility between cpu`s that have good IMC`s or the Worst IMC`s and people that use 4 sticks of DDR ram compared to 2 sticks ect ect
if your stable @1.1v on both then leave it there and be done with it

but the more optimal would be setting both at 1.15v and leave it there.

Your voltages look fine.
though if you up your cache setting from 44 to 48ect i would use the 1.15v for both.

C6ckneyGeezer · 9 Jun 2018 at 14:25

ViRuS2k said:
There set high by the motherboard vendors as to make it much easier for compatibility between cpu`s that have good IMC`s or the Worst IMC`s and people that use 4 sticks of DDR ram compared to 2 sticks ect ect
if your stable @1.1v on both then leave it there and be done with it but the more optimal would be setting both at 1.15v and leave it there.

Your voltages look fine.
though if you up your cache setting from 44 to 48ect i would use the 1.15v for both.

Thanks for the reply. So the voltage of 1.328 on VCCIO is still acceptable, no damage done? Yep all seems fine at 1.1v on both. Would there be any performance gain in upping the cache clock? Indeed currently at 44x.

ViRuS2k · 9 Jun 2018 at 22:23

VCCIO @1.115v
VCCSA @1.118v
Apart from 1-2c difference in temps thats all and then run 1/1 with your clock 48 cache.
8700k`s have better cache than previous gen and can clock higher with ease running 1/1 does benefit in some situations`s

EDIT: and yes maximum for safe voltage would be 1.3v on vccio or vccsa as there is not much need for going any higher unless you run seriously fast memory.. with more than 2 dims populated.

8 Pack · 12 Jun 2018 at 20:49

It's running on most cpus with Vccio 1.05, Vccsa 1.1, cpu standby 1.05 no need for more.

C6ckneyGeezer · 14 Jun 2018 at 22:25

ViRuS2k said:
VCCIO @1.115v
VCCSA @1.118v
Apart from 1-2c difference in temps thats all and then run 1/1 with your clock 48 cache.
8700k`s have better cache than previous gen and can clock higher with ease running 1/1 does benefit in some situations`s

EDIT: and yes maximum for safe voltage would be 1.3v on vccio or vccsa as there is not much need for going any higher unless you run seriously fast memory.. with more than 2 dims populated.

8 Pack said:
It's running on most cpus with Vccio 1.05, Vccsa 1.1, cpu standby 1.05 no need for more.

In the mean time I set VCCIO, VCCSA, CPU standby and PLL termination all to standard volts and seems stable. It also it seems knocked a few degree's off my cpu temp? How can you test if these settings are stable, Prime 95? Also, whats the best cache clock to run? 1:1 ok?

ViRuS2k · 16 Jun 2018 at 07:39

run your cache clock 1/1 if you can and run prime95 none avx for 1 hour and run realbench for 4 loops
and set your avx ratio to 2 or 3 then if it passes all those then consider it stable....
just remember you might need to up the system agent voltage if you run 1/1 cache.

You should have no issues running 1/1 though depending on if you have all dims populated ect you might need more sys agent voltage....

i run 5.2ghz with 5.0ghz cache with avx -2 and sys and io voltage at 1.19v as i run 4 high clocked 4000mhz 8 pack dims.

koooowweeee · 17 Jun 2018 at 16:24

do this setting apply for x99 as well? im just starting to overclock my 5930k got it to 4.6 stable but i cant get my ram to run at the right speed :/

ViRuS2k · 18 Jun 2018 at 18:40

yes should work for x99 also, but for ram you might need to tweak sa and io for higher clocks as well as a combination of higher dram voltage.
but just remember dont use the same voltages that are above yours might be different, hence i dont want you to blow up stuff lol so do some research first. google.

DexterMorgan · 14 May 2020 at 10:59

hi, 8700k at 4,900MHz, 1.38V and then RAM 3200Mhz from 2400Mhz at 1,40V and vccsa and vccio ar hitting both around 1.20V am i getting into th trouble with that ?

also with regards to RAM, they are corsair 2400Mhz 16CL at 2800 it is ok at 16 16 16 39 ( but nominal from auto is 19 19 19 49_ but when in auto at 3200Mhz timings are : 22 22 22 52 , is better in your opinion to drop the freq and tighten the timings? or keep at high freq with worse timings ?

many thanks