Who actually has an i5-8400?

Aretak · 11 Oct 2017 at 13:48

Got mine up and running. No problems handling the 3866MHz RAM just by enabling XMP, which is nice.

It's a G.Skill Samsung B-die kit. I suspect any performance uplift probably wouldn't be worth the £250 or so it's currently going for normally.

Have to leave further tweaking and putting it through its paces properly for later, but first impressions are positive at least.

Mrjobby · 11 Oct 2017 at 14:19

Wonder if they will be as picky as ryzen.

Prob my next CPU purchase.

Klo · 11 Oct 2017 at 14:21

I want to see the 8400 vs 8600k when it comes to gaming. 8700k is out of my budget.

gavinh87 · 11 Oct 2017 at 14:23

Mrjobby said:
Wonder if they will be as picky as ryzen.

Prob my next CPU purchase.

Nowhere near, you can pretty much throw anything in these and it will be fine.

@Klo this might be worth a look http://www.pcgamer.com/intel-i5-8400-review-the-best-new-gaming-cpu-in-years/

Mrjobby · 11 Oct 2017 at 14:26

Deal clincher for me, that B-die stuff is loopy money.

GinG · 12 Oct 2017 at 08:25

southernorth said:
https://www.purepc.pl/procesory/test_intel_core_i5_8400_vs_amd_ryzen_5_1600_wojna_szesciu_rdzeni

A detailed review of Ryzen 1600 v i5-8400. Just as we knew that 1600 benefited hugely from faster RAM, now we know that Coffeelake does too.

That is absolutely smashing it in the games...especially BF1 which I am most interested about.

CAT-THE-FIFTH · 12 Oct 2017 at 10:16

GinG said:
That is absolutely smashing it in the games...especially BF1 which I am most interested about.

The review says the following:

The title in the single player does not put great demands on the processor, so you see very high values in the charts.

AFAIK,BF1 MP will probably be tested by places like Hardware Unboxed IIRC when they get their review out.

southernorth · 12 Oct 2017 at 16:00

It's only 1 sample size, but the video below is an i5-8400 with a stock intel cooler maintaining 3.8ghz all cores at reasonable temperatures. Uploader doesn't know what MCE is either, so we could assume it's off.

muon · 15 Oct 2017 at 18:06

MCE on the 8400 wouldn't do much anyway. Just takes it to 4ghz.

Its the 8700K and such which gets a massive overclock with MCE.

southernorth · 15 Oct 2017 at 18:41

muon said:
MCE on the 8400 wouldn't do much anyway. Just takes it to 4ghz.

Its the 8700K and such which gets a massive overclock with MCE.

muon · 16 Oct 2017 at 00:06

southernorth said:

He did only use a stock cooler. On better cooling it might boost all cores higher to 4ghz.

southernorth · 16 Oct 2017 at 00:09

muon said:
He did only use a stock cooler. On better cooling it might boost all cores higher to 4ghz.

In the gameplay vids on his channel he's using a 240 AIO and it still only boost to 3.8ghz

muon · 16 Oct 2017 at 00:12

southernorth said:
In the gameplay vids on his channel he's using a 240 AIO and it still only boost to 3.8ghz

Well MCE on the 8700K has been shown to definitely hit higher clocks.

https://www.gamersnexus.net/guides/3077-explaining-coffee-lake-turbo-8700k-8600k

It may be motherboard and bios specific as ultimately that is what controls overclocking.

AndreiD · 16 Oct 2017 at 00:34

That's how MCE worked for years now, I had it on my old Z77 board. It's not something that should be turned on by default since the voltages it sets are fairly awful because they have to account even for the chips that lost the silicon lottery.

But it's pretty nice if you have a locked chip. I wonder if we'll get some BIOS versions with BCLK overclocking for locked chips, a few boards have clock generators on them.

southernorth · 16 Oct 2017 at 00:36

AndreiD said:
That's how MCE worked for years now, I had it on my old Z77 board. It's not something that should be turned on by default since the voltages it sets are fairly awful because they have to account even for the chips that lost the silicon lottery.

But it's pretty nice if you have a locked chip. I wonder if we'll get some BIOS versions with BCLK overclocking for locked chips, a few boards have clock generators on them.

You can BLCK overclock the 8400 at the moment, to around 102mhz. I think that translates to 3.9ghz all cores instead of 3.8ghz.

LabR@t · 16 Oct 2017 at 16:17

southernorth said:
You can BLCK overclock the 8400 at the moment, to around 102mhz. I think that translates to 3.9ghz all cores instead of 3.8ghz.

A whole 100mhz, lol

southernorth · 16 Oct 2017 at 16:25

LabR@t said:
A whole 100mhz, lol

Is quote dissapointing, but we can't expect much after Intel locked down BLCK a few years ago. Think you could get like 4.5ghz on locked chips at one point

Aretak · 16 Oct 2017 at 23:01

muon said:
Well MCE on the 8700K has been shown to definitely hit higher clocks.

https://www.gamersnexus.net/guides/3077-explaining-coffee-lake-turbo-8700k-8600k

It may be motherboard and bios specific as ultimately that is what controls overclocking.

I've had mine on both an ASRock Gaming K6 (which I returned after having issues) and now an Aorus Gaming 7, and MCE has had no effect on the 8400 on either. There have been no other reports of it boosting to 4GHz on all cores anywhere as far as I know, so it's pretty safe to say that Intel aren't allowing it to work on non-K chips. The Gigabyte board actually presents a whole load more options with it than the ASRock one, which hid almost all overclocking stuff with a non-K part. However, even manually setting the turbo ratios to 40x has no effect. However, you can overclock the uncore on the Gigabyte board (no option to on the ASRock). I set it to 4GHz, but the highest I've actually seen it hit is 3.7GHz. Still a decent bump from the default 2.8GHz though and it improves performance a few percent based on PC Gamer's review.

southernorth · 16 Oct 2017 at 23:04

I've seen somehow report 4ghz all cores with an 8400:

https://imgur.com/5XXmeWr

southernorth · 16 Oct 2017 at 23:06

Aretak said:
I've had mine on both an ASRock Gaming K6 (which I returned after having issues) and now an Aorus Gaming 7, and MCE has had no effect on the 8400 on either. There have been no other reports of it boosting to 4GHz on all cores anywhere as far as I know, so it's pretty safe to say that Intel aren't allowing it to work on non-K chips. The Gigabyte board actually presents a whole load more options with it than the ASRock one, which hid almost all overclocking stuff with a non-K part. However, even manually setting the turbo ratios to 40x has no effect. However, you can overclock the uncore on the Gigabyte board (no option to on the ASRock). I set it to 4GHz, but the highest I've actually seen it hit is 3.7GHz. Still a decent bump from the default 2.8GHz though and it improves performance a few percent based on PC Gamer's review.

https://www.reddit.com/r/intel/comm..._mce_on_will_it_do_4ghz_on_all_cores/dofc356/