Asus Z370F - i7 8700k or i7 9700k?

[Blueyoshi03]

I've read the thousands of variations on this argument but I cant find a specific answer to this specific dilemma.

I have an Asus ROG Z370f and want to buy a 2nd hand i7 8700k or i7 9700k but from what I can tell the performance is almost identical if you overclock the 8700k to 5gz which would benefit greatly from a delid (unless a generic 240mm aio is ok with this OC). Therefor the prices start to get very close when comparing 8700k + LM + delid tool vs 9700k.

So I was wondering if I decided to get the 9700k, A) would it show any sign of performance loss being on this meh Z370, and B) would it absolutely crap itself on a mild overclock using this board.

Ultimately trying to decide on 8700k vs 9700k

 

[Blueyoshi03]

Hmmm. So I decided on the 9700k. I have it and just updated my bios to 2201 using the EZ flash bios wizard. I have reset my fan curve and rebooted a few times but the whole system is stuck on 100% fan now?

Any ideas?

 

[Blueyoshi03]

You sir were 100% correct. Changed to PWM and it's fixed

 

[Blueyoshi03]

Just installed it, seems to be D stepping, whatever that is

 

[Blueyoshi03]

So I've noticed a couple problems: it only turbos to 4.6ghz which I believe is cos my motherboard is for some reason only giving it 1.02v, so I will overclock eventually, although I'm worried that even that low I'm seeing 27-45c when I'm idle or have chrome open. I seemed to only go up to 60c under 100% load when working on photo editing software

Secondly theres now a constant fairly loud buzzing high frequency coming from my computer. My 1080ti does have some whine but this is different. It's not my fans or drives, the only thing I thought was my pump since the bios had it at 100% constantly. Changed it to PWM minimum 50%, but it's still the same volume. It might be the gpu still though cos the buzzing doesnt happen in the bios, only once booted but it's really annoying and noticeable unless I have headphones. But how can a gpu start making noise due to a new cpu

 

[Blueyoshi03]

Interesting. I hadn't considered it could be my power supply. That very well could be it.

After work I'll boot without my gpu and see what happens, then I might try to overclock and see what happens. I have a CX 750w which isnt a high quality PSU so maybe upgrade that? I hoped it would last longer tbh considering the 750w

 

[Blueyoshi03]

So this is the first overclock i've ever done and i'm currently at 5ghz @ 1.32v and about to stress test but somehow the buzzing whining noise is gone... no clue why or how but it has

 

[Blueyoshi03]

Not tweaked a massive amount, but it looks like 1.32v is the absolute lowest I can go, and I've dropped down to 4.8ghz and still unstable which sounds bad

 

[Blueyoshi03]

So a few things I need help on with my overclock. I followed https://youtu.be/bD1Ze80GpLo these guides and have ended up with 1.33v 4.8ghz all core -2 avx offset and I'm seemingly stable but massively unhappy with those results especially when even at 4.6ghz I'm approaching 90c in prime 95 in minutes

I have noticed my 1.33v has a vdroop down to 1.312v according to CPUz and under the prime 95 stress test I've just discovered it drops and holds at 1.26v which may explain why it's super unstable when I'm setting below 1.33v in the bios.

I am going to get a 360mm aio at christmas which should help temps a lot more than my cooler master 240mm, but any solutions from stopping this massive vdroop? (Apologies in advance if this is the wrong use of the term)