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8700k or a 9700k for thermals

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post #1 of 22 (permalink) Old 11-07-2019, 03:06 AM - Thread Starter
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8700k or a 9700k for thermals

Hi probably the been asked 100 times on here but hopefully this is a slightly different twist on the question.

I am currently gathering the parts to upgrade my mini-ITX (Silverstone RVZ01) with the following:

New Parts:
Z370I Gaming Pro Carbon Mini-ATX (£100)
8700K (Pre delidded with Conductonaut) (£240)
Corsair LPX 3200Mhz 16GB (£60)
2070 Super

Existing
500W Silverstone SFX 500
Corsair H55 with an external 120mm and an internal 120mm low profile internal.

I'm trying to make this a value build and i've got it in my head i'd really like to have a 5ghz 24-7 overclock (silicone lottery) permitting. I'd be happy to step down to 4.9ghz etc if the jump in volts isn't worth the gain.
I've obviously got a a real thermal wall here with the size of my case and the cooling available. I'm open to new cooling but it has to fit within the case.

A second hand 9700k has just come up locally and will cost around £30 more then what I paid for the 8700k. Should I make the change for thermal reasons over performance? (I will sell on the 8700k).

I've also got one eye on the new consoles. Whats going to be better long term? 6 cores 12 threads or 8 cores 8 threads? Bearing in mind my last build 3770k lasted me 4/5 years i'd like this to be the same (on the CPU).

Any help, thoughts and comments much appreciated.

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post #2 of 22 (permalink) Old 11-07-2019, 08:11 AM
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The i7 8700k will run cooler for about the same performance as the i7 9700k.

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post #3 of 22 (permalink) Old 11-08-2019, 06:26 PM
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It is already delidded with liquid metal I would just stick with that personally, it'd be a side-grade at best.

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post #4 of 22 (permalink) Old 11-10-2019, 01:34 AM - Thread Starter
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Well got all the bits together.
Seems the 8700k does need some voltage to hit 5ghz. I'm at 1.345v at the moment. Think I'm close to getting stable. It passes benchmarks, cinebench, firesrike and normal Intel burn test. Fell over after 6 passes on very high.
I'm wondering if rolling the Dice on the 9700k (buyer happy to accept £280) is worth the gamble?
Do 9700k's hit 5ghz with less voltage on average?

Sent from my SM-N9600 using Tapatalk

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post #5 of 22 (permalink) Old 11-10-2019, 11:03 AM
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Quote: Originally Posted by mardon View Post
Well got all the bits together.
Seems the 8700k does need some voltage to hit 5ghz. I'm at 1.345v at the moment. Think I'm close to getting stable. It passes benchmarks, cinebench, firesrike and normal Intel burn test. Fell over after 6 passes on very high.
I'm wondering if rolling the Dice on the 9700k (buyer happy to accept £280) is worth the gamble?
Do 9700k's hit 5ghz with less voltage on average?

Sent from my SM-N9600 using Tapatalk
The 9700k's need increased core voltage compared the i7 8700k's for 5.0GHz.

My i7 9700k
Prime95 AVX disabled.
Overclocking 4.9GHz LLC AUTO, DVID -0.170 = 1.320v core voltage
Noctua U14S Max temperature 96c ambient 71F,
CPU Package 176 watts

My i5 8600k
Prime95 AVX disabled.
Overclocking 5.0GHz LLC AUTO, DVID +0.120 = 1.296v core voltage
Noctua U14S Max temperature 87c ambient 73F
CPU Package 122.67 watts

i5 8600K OC 5.0GHz
Noctua NH-U14S
Motherboard Gigabyte Z370-HD3
G.SKILL Ripjaws v 16GB F4-3200C14D-16GVK XMP Speed 3200 14-14-14-34
EVGA GeForce RTX 2070 XC ULTRA GAMING
ASUS VG279Q 27" 1920x1080p 144Hz IPS panel G-Sync compatible
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post #6 of 22 (permalink) Old 11-10-2019, 05:12 PM
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Quote: Originally Posted by wingman99 View Post
The i7 8700k will run cooler for about the same performance as the i7 9700k.
Untrue. I owned both. 9700k will run cooler. 9700k is soldered. 8700k will hit the thermal ceiling with same cooling almost instant when running Aida64

Delidding 8700k may or may not be about the same. Depends on your voltage and overclocks.

I had better thermals with 9700k with overclock (same voltage). BUT...I had a golden 8700k that overclocked at lower temps, with lower voltage of about 1.26v to 5.0 ghz

If you want better thermals with no delidding/liquid metal, then go for 9700k

Quote: Originally Posted by mardon View Post
Well got all the bits together.
Seems the 8700k does need some voltage to hit 5ghz. I'm at 1.345v at the moment. Think I'm close to getting stable. It passes benchmarks, cinebench, firesrike and normal Intel burn test. Fell over after 6 passes on very high.
I'm wondering if rolling the Dice on the 9700k (buyer happy to accept £280) is worth the gamble?
Do 9700k's hit 5ghz with less voltage on average?

Sent from my SM-N9600 using Tapatalk

It will require higher voltage, but it will beat 8700k in a lot of gaming stuff, because of true 8 cores. It will perform slightly less in rendering tasks though, because of no hyperthreading

9700k is about 19% less powerful than 9900k in per core performance, 8700k about 24% weaker than 9900k.

I had 8700k, 9700k and now own 9900k.

9900k is a definite winner, 9700k is close enough second. 8700k feels like chip from another family. Hard to explain, but I would only go for 9900k because I saw limitation in both 8700k and 9700k.

9700k is more solid, but it doesn't have hyperthreading. Thus lacking rendering power of 8700k and 9900k. BUT...I would not buy 8700k, because I saw R6 Siege utilization almost 100% of that cpu at times.

100% utilization causes stutter. No stutters with 9900k. 9700k gives more headroom than 8700k for gaming, but it's right on the edge for modern gaming. 6 cores seem to be not enough for many games (for flawless gaming experience) even if you have a great GPU. As soon as CPU hits 100% you will see micro stutter.

Last edited by XLifted; 11-10-2019 at 05:21 PM.
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post #7 of 22 (permalink) Old 11-10-2019, 05:19 PM
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Quote: Originally Posted by wingman99 View Post
The 9700k's need increased core voltage compared the i7 8700k's for 5.0GHz.

My i7 9700k
Prime95 AVX disabled.
Overclocking 4.9GHz LLC AUTO, DVID -0.170 = 1.320v core voltage
Noctua U14S Max temperature 96c ambient 71F,
CPU Package 176 watts

My i5 8600k
Prime95 AVX disabled.
Overclocking 5.0GHz LLC AUTO, DVID +0.120 = 1.296v core voltage
Noctua U14S Max temperature 87c ambient 73F
CPU Package 122.67 watts

Mah dud. i5 is not i7.

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post #8 of 22 (permalink) Old 11-10-2019, 05:38 PM
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ignoring that the 8600K wasn't even an option, if your 9700K needs 1.32v for 4.9 you got a crap chip. that's 5.1 voltage territory, and there's no reason to expect a golden 8700K and a terrible 9700K.

OP: I wouldn't consider buying an 8700K or a 9700K this late into 2019. the 3700/3800X are smarter buys than both and the 3900X is a better buy than the 9900K.

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post #9 of 22 (permalink) Old 11-10-2019, 07:48 PM
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Quote: Originally Posted by XLifted View Post
Untrue. I owned both. 9700k will run cooler. 9700k is soldered. 8700k will hit the thermal ceiling with same cooling almost instant when running Aida64

Delidding 8700k may or may not be about the same. Depends on your voltage and overclocks.

I had better thermals with 9700k with overclock (same voltage). BUT...I had a golden 8700k that overclocked at lower temps, with lower voltage of about 1.26v to 5.0 ghz

If you want better thermals with no delidding/liquid metal, then go for 9700k
First you say the 9700k will run cooler, then you say the 8700k ran at lower temps with lower voltage.
Quote: Originally Posted by BroadPwns View Post
Mah dud. i5 is not i7.
Also i7 8700k 6 core is not a 8 core i7 9700k either apples to apples if you want to be specific.
Quote: Originally Posted by The Pook View Post
ignoring that the 8600K wasn't even an option, if your 9700K needs 1.32v for 4.9 you got a crap chip. that's 5.1 voltage territory, and there's no reason to expect a golden 8700K and a terrible 9700K.
I purchased the i7 9700k from silicon lottery rated 1.35v for 5.0GHz, the i7 9700k was rated at a higher core voltage than the i9 9900k at 1.30v for 5.0GHz. I sent it back to silicon lottery and got all my money back. Intel's i7 9700k's are i9 9900's that don't make the higher binning for 5.0GHz.

i5 8600K OC 5.0GHz
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Motherboard Gigabyte Z370-HD3
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post #10 of 22 (permalink) Old 11-10-2019, 07:51 PM
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Because you apparently do not see the difference - https://www.purepc.pl/procesory/test...niuf?page=0,51

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