Intel "Coffee Lake" Builders Thread

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crashtech

Lifer
Jan 4, 2013
10,556
2,139
146
I never argued against linear perf scaling. I said perf never scales 1:1 with clock increase and thats a measurable fact.
Okay, after re-reading your posts, I think you are just using the term "100%" in a way that is ambiguous, since "100%" is mainly used by people to mean fully, totally, or completely. Saying 1:1 is far clearer, and I agree with you now.
 

coercitiv

Diamond Member
Jan 24, 2014
6,412
12,878
136
Any chance we could get like a low powered i7 8700t 25w or 35w part? I could for sure use a 6c/12t part but would love a energy efficient ultra low power version. I know the i7 8700 non "K:" version is 65w already so maybe if they drop the stock clock to something like 2.6Ghz with a turbo boost up to 3.6Ghz would be perfect for me.
Enter BIOS, change Long Term Power and Short Term Power to lower values like 35W and 45W respectively and you'll have a CPU that will dynamically clock to fit into 35W TDP. If you set Short Term Power at 45W like in my example, then it will use 45W for a limited time duration before dropping down to 35W: this is useful for burst loads of 15-30 seconds. The time interval in which Short Term Power is allowed can also be configured.

TDP can be configured as low as 20-25W. The CPU will use the highest frequencies it can under any load, the highest allowed by your multipliers ofc. If you take the 8700 and configure it for 35W TDP, it will boost to it's max frequency for 1-2 threads, but higher thread counts may end up running at lower frequencies than stock, depending on power usage. To make the most out of a low TDP setting you may want to make sure C states are enableb in BIOS, not just set to Auto.

Las but not least, you can also overclock while running a lower than stock TDP. In theory you can have a 5Ghz 8700K @ 65W TDP: it will boost to 5Ghz as long as power usage is bellow the limit, then drop clocks to fit the thermal envelope.

This type of power management has been around on Intel CPUs ever since Sandy Bridge. It got refined and gradually exposed to the user with every new generation. It offers excellent flexibility and is the reason why I always try to make sure the boards I purchase expose the features via BIOS. (probably all Z boards do, but I would check on cheaper models)
 

Justinbaileyman

Golden Member
Aug 17, 2013
1,980
249
106
Enter BIOS, change Long Term Power and Short Term Power to lower values like 35W and 45W respectively and you'll have a CPU that will dynamically clock to fit into 35W TDP. If you set Short Term Power at 45W like in my example, then it will use 45W for a limited time duration before dropping down to 35W: this is useful for burst loads of 15-30 seconds. The time interval in which Short Term Power is allowed can also be configured.

TDP can be configured as low as 20-25W. The CPU will use the highest frequencies it can under any load, the highest allowed by your multipliers ofc. If you take the 8700 and configure it for 35W TDP, it will boost to it's max frequency for 1-2 threads, but higher thread counts may end up running at lower frequencies than stock, depending on power usage. To make the most out of a low TDP setting you may want to make sure C states are enableb in BIOS, not just set to Auto.

Las but not least, you can also overclock while running a lower than stock TDP. In theory you can have a 5Ghz 8700K @ 65W TDP: it will boost to 5Ghz as long as power usage is bellow the limit, then drop clocks to fit the thermal envelope.

This type of power management has been around on Intel CPUs ever since Sandy Bridge. It got refined and gradually exposed to the user with every new generation. It offers excellent flexibility and is the reason why I always try to make sure the boards I purchase expose the features via BIOS. (probably all Z boards do, but I would check on cheaper models)
Oh thats great info thanks for posting I will give it a shot soon as I get a cpu to try it out with.. now if newegg or B&H will just stock there inventory we'd be golden.
 
Reactions: Crono

TheF34RChannel

Senior member
May 18, 2017
786
309
136
Wow! Great news indeed!

And not what the shop said so that was a nice surprise this morning!! Have a hero incoming tomorrow. Sadly no Apex but beggars can't be choosers.

absolutely not. Is the best part of win 10. You can swap drives and boot with no problem.

So I can put in a new motherboard, CPU and RAM and use the same installation?? That'd be a first if so, what's needed? A repair? And the end result trouble free?
 
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Slappi

Member
Dec 7, 2002
72
31
86
And not what the shop said so that was a nice surprise this morning!! Have a hero incoming tomorrow. Sadly no Apex but beggars can't be choosers.



So I can put in a new motherboard, CPU and RAM and use the same installation?? That'd be a first if so, what's needed? A repair? And the end result trouble free?


They shipped you an 8700k!?!
 

Crono

Lifer
Aug 8, 2001
23,720
1,501
136
And not what the shop said so that was a nice surprise this morning!! Have a hero incoming tomorrow. Sadly no Apex but beggars can't be choosers.



So I can put in a new motherboard, CPU and RAM and use the same installation?? That'd be a first if so, what's needed? A repair? And the end result trouble free?

You don't even need to use repair. At most you'll have to activate again (not a problem if it's full retail, though you may need to purchase new copy/key if it's OEM, or call Microsoft support).

It should be trouble free. Usually the only trouble I've ever had (and I've done this maybe a half dozen times between 8/8.1/10) is when switching GPU as well, which sometimes causes control center crashing going Nvidia to AMD or vice-versa. But even that is minor, and uninstall with DDU cleans up any messy files left behind. Even AMD to Intel (just moved my m.2 from a Ryzen machine to 8700) worked fine, though I ended up wiping and reinstalling Windows 10 just to make sure my benchmarks were done ona clean system for comparison purposes.

A clean install of Windows always preferable, though, just in case there are other pesky drivers that are incompatible. Make a backup of your files, in any case, if you haven't already.
 
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scannall

Golden Member
Jan 1, 2012
1,948
1,640
136
Change the lightbulb in your bedside lamp to an LED for $10. Boom, done.

I don't mean to single you out, but after months of reading hysterical comments on "power hog" cpu's I think we've lost a wee bit of perspective on just how much energy we're talking about.
All the lights in my home are LED. But I think you're missing a part of the problem. It isn't the electricity bill, it's the heat and noise. Bad thermals produce more heat, which can be a problem itself in hotter climates. Then the fan noise to cool it.
 

TheF34RChannel

Senior member
May 18, 2017
786
309
136
They shipped you an 8700k!?!

Yep

You don't even need to use repair. At most you'll have to activate again (not a problem if it's full retail, though you may need to purchase new copy/key if it's OEM, or call Microsoft support).

It should be trouble free. Usually the only trouble I've ever had (and I've done this maybe a half dozen times between 8/8.1/10) is when switching GPU as well, which sometimes causes control center crashing going Nvidia to AMD or vice-versa. But even that is minor, and uninstall with DDU cleans up any messy files left behind. Even AMD to Intel (just moved my m.2 from a Ryzen machine to 8700) worked fine, though I ended up wiping and reinstalling Windows 10 just to make sure my benchmarks were done ona clean system for comparison purposes.

A clean install of Windows always preferable, though, just in case there are other pesky drivers that are incompatible. Make a backup of your files, in any case, if you haven't already.

Well if it's that easy I'll be well happy! Installing everything is such a pain. Can always do it if it goes awry. I'll uninstall any board drivers beforehand as well.
 

dullard

Elite Member
May 21, 2001
25,214
3,632
126
Change the lightbulb in your bedside lamp to an LED for $10. Boom, done.

I don't mean to single you out, but after months of reading hysterical comments on "power hog" cpu's I think we've lost a wee bit of perspective on just how much energy we're talking about.
All the lights in my home are LED. But I think you're missing a part of the problem. It isn't the electricity bill, it's the heat and noise. Bad thermals produce more heat, which can be a problem itself in hotter climates. Then the fan noise to cool it.
Continuing with scannall's post, many people have their computers in desks with closed cabinets. That means getting the heat out is slow, CPUs throttle down to base clocks far more, and the fans which run full speed all the time bring in a lot of dust which makes the whole problem worse. Forgive me, but I do not recall seeing many computer desk cabinets with lightbulbs inside to switch out (and if you do have one, the better solution may be to remove that lightbulb entirely). And there are many people who want a small sleek computer outside of a cabinet, but then the small case usually doesn't have great cooling.

And that doesn't go into added space and costs from needing a larger UPS.
 
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TheF34RChannel

Senior member
May 18, 2017
786
309
136
I take it that means you pre-order has landed?

It has indeed! The board will be here shortly and that's me all sorted. I'll do it all this weekend though.

Son of a %$&#@ mother $%&#^* lol just kidding congrats post some rig photos when you get a chance we US people are still waiting. Insert sad face here

Hey how did you know my nicknames? I'll try (mobile phone camera = ...meh). I'm still amazed it came through rather quickly, especially as the shop just shrugged at my inquiries when they'd come in in the first place.

-- My Windows 10 comes from my Windows 8.1 (OEM). Let's see what happens. I truly hope plugging in new hardware goes hassle free and I save myself some money in the meantime.
 
Reactions: Crono

TheF34RChannel

Senior member
May 18, 2017
786
309
136
Ok you just suck on so many levels J/K, Congratulations on your score !! I am so jealous right now though.. Come on newegg ship the rest of us our darn cpu's already!! Errrr

Thanks man! How weird is it that the egg isn't shipping their orders when they (not the egg) do in my small land?
 

Aikouka

Lifer
Nov 27, 2001
30,383
912
126
ShopBLT still seems to say 10/26 and 11/2 for Coffee Lake.

Interesting note is that they have a lot more of the K chips on the way than they have pre-orders to fill, but for the 8700, they have way more pre-orders than they have chips on the way.

8100 and 8350K are in short supply and they don't have many on the way, either.

http://www.shopblt.com/search/order_id=723546900&s_max=25&t_all=1&s_all=COFFEE+LAKE&search=Search

It's tempting to try and "double book" an 8700k to make sure I get one in a timely manner. I should be good with Newegg since my order went through at 12:04 PST, but who knows. I wish Newegg would give us even a fragment of the information that BLT is providing.

EDIT:

Scratch that... Newegg just charged me, so I assume I'm getting my CPU soon. Their site says it'll ship tomorrow from NJ. So, if I'm lucky, I should get it on Friday.
 
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The Stilt

Golden Member
Dec 5, 2015
1,709
3,057
106
Got my CPU yesterday.
Nothing spectacular, but still quite decent I'd imagine.
4.9GHz Prime95 would be doable if the chip wouldn't overheat at higher voltages.
Cooled by Deepcool Assassin II.

I was quite surprised to see that even the mainstream boards can easily hit 4000MHz MEMCLK.
I'm not sure if there is something special in the Z370-A PRIME, but I've seen several reports that the Z370 Strix boards have hard time reaching anything higher than 3600MHz.
Strix and PRIME are essentially identical so I wouldn't think there is any difference in the signaling either. But I guess you never know.





 
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