Overclock.net › Forums › Intel › Intel CPUs › i7 8700k overclock results and settings
New Posts  All Forums:Forum Nav:

i7 8700k overclock results and settings - Page 104

post #1031 of 1300
Quote:
Originally Posted by marik123 View Post

The power supply I have is Corsair CS450M 80 plus gold. According to anandtech's hot chart, I still get really good efficiency at 350-400w load. I know it's not the most ideal power supply for an overclocked 8700k plus gtx1080, and I do plan to replace it with a 80 plus platinum power supply with 550+ in the future. biggrin.gif I got it for $28.50 shipped on ebay, couldn't pass that deal and in fact my old FSP Aurum 400w 80 plus gold can sustain my old 7700K 5Ghz 1.38v, same RAM except at 3600mhz CL15 and same GPU I currently have. So I really don't see any reason why my current 450W won't work. wink.gif

https://www.anandtech.com/print/9343/the-corsair-cs450m-psu-review


I have a seasonic gold 850W, for a 8700K + 2 1080Fes. I was almost getting dual 1080tis, fes, which would put me around 800W.
The problem is i dont feel confortable being this near to rated wattage of psu, even being a very solid unit, and its not even about power efficiency, but the wear it can induce in prolonged time leading to some sort of failure in future.

An OC custom 1080 can draw near 220-240W, + around 200w for a heavy 8700K OC. It puts you around your rated wattage with little room for all else. I think the 80% load guideline is the best in terms of thermals, tear and efficiency.
post #1032 of 1300
Quote:
Originally Posted by postem View Post

I have a seasonic gold 850W, for a 8700K + 2 1080Fes. I was almost getting dual 1080tis, fes, which would put me around 800W.
The problem is i dont feel confortable being this near to rated wattage of psu, even being a very solid unit, and its not even about power efficiency, but the wear it can induce in prolonged time leading to some sort of failure in future.

An OC custom 1080 can draw near 220-240W, + around 200w for a heavy 8700K OC. It puts you around your rated wattage with little room for all else. I think the 80% load guideline is the best in terms of thermals, tear and efficiency.

In this case if I get 550w 80 plus platinum power supply, I should be good to go right?
    
CPUMotherboardGraphicsRAM
i7 8700K @ 5.0Ghz Delid CLU/MX4 1.344v Asrock Z370 Extreme4 1.30 BIOS MSI Armor GTX1080 2075/11000 @ 1.0675v MX4 G.Skill 16GB DDR4 3200C14 o/c 4133C17 1.4v 
Hard DriveHard DriveOptical DriveCooling
128GB Samsung PM961 SSD NvME 4TB WD Red PRO Hard Drive 7200RPM LG DVDRW SATA Cryorig H5 Universal 
CoolingOSMonitorKeyboard
4x Coolermaster 120mm Silent Case Fan Windows 10 x64 Pro Dell S2240M 21.5 LED IPS Monitor HP Wireless Elite Keyboard 
PowerCaseMouseAudio
Corsair CS450M 80 Plus Gold Corsair Carbide Spec-01 HP Wireless Elite Mouse Altec Lansing ACS54 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 8700K @ 5.0Ghz Delid CLU/MX4 1.344v Asrock Z370 Extreme4 1.30 BIOS MSI Armor GTX1080 2075/11000 @ 1.0675v MX4 G.Skill 16GB DDR4 3200C14 o/c 4133C17 1.4v 
Hard DriveHard DriveOptical DriveCooling
128GB Samsung PM961 SSD NvME 4TB WD Red PRO Hard Drive 7200RPM LG DVDRW SATA Cryorig H5 Universal 
CoolingOSMonitorKeyboard
4x Coolermaster 120mm Silent Case Fan Windows 10 x64 Pro Dell S2240M 21.5 LED IPS Monitor HP Wireless Elite Keyboard 
PowerCaseMouseAudio
Corsair CS450M 80 Plus Gold Corsair Carbide Spec-01 HP Wireless Elite Mouse Altec Lansing ACS54 
  hide details  
Reply
post #1033 of 1300
Rougly 200w CPU + 220w GPU + disks/see/fans you should be around 450-500w so yes, but you are always limited if you want to use a more powerful gpu.
Since a 650 psu isn't that much costly over I suggest you go for it.
I still believe 80% to be the best load.
Edited by postem - 12/7/17 at 12:58pm
post #1034 of 1300
I have been looking at this thread for a while now to fine tune my own overclock. I am stuck at 4.8 Ghz on my 8700K @ 1.288v. Anything less and my PC crashes during the Encoding part of the Asus Realbench test and I don't want to use an AVX offset since any game I play triggers it somehow.... For 4.9 Ghz I need a whopping 1.38v to be stable. I don't know what settings to play around with anymore. I disabled XMP, ran my RAM at the stock Jedec speed, decreased the cache ratio to 4 Ghz, played around with different LCC levels but I am not able to get my PC stable with anything less than 1.38v which is way too high IMO... My motherboard is the MSI Z370 SLI Plus. Can anyone recommend me some settings? I have already looked into quite a few so yeah :/ Thanks in advance!
post #1035 of 1300
Have you played with SA/IO voltage at all? Apparently they can help a bit with stability.
post #1036 of 1300
Quote:
Originally Posted by Rowethren View Post

Have you played with SA/IO voltage at all? Apparently they can help a bit with stability.

Yes I increased those voltages to 1.25 but I still have the same overclock result...
post #1037 of 1300
I should note that I am able to hit 5 Ghz @ 1.33V stable when I disable Hyperthreading. I dont know if that means anything but still
post #1038 of 1300
Quote:
Originally Posted by Nevercholt View Post

I should note that I am able to hit 5 Ghz @ 1.33V stable when I disable Hyperthreading. I dont know if that means anything but still

That basically turns your processor into a i7 8600K, albeit a much better binned one.
Quote:
Originally Posted by Nevercholt View Post

I have been looking at this thread for a while now to fine tune my own overclock. I am stuck at 4.8 Ghz on my 8700K @ 1.288v. Anything less and my PC crashes during the Encoding part of the Asus Realbench test and I don't want to use an AVX offset since any game I play triggers it somehow.... For 4.9 Ghz I need a whopping 1.38v to be stable. I don't know what settings to play around with anymore. I disabled XMP, ran my RAM at the stock Jedec speed, decreased the cache ratio to 4 Ghz, played around with different LCC levels but I am not able to get my PC stable with anything less than 1.38v which is way too high IMO... My motherboard is the MSI Z370 SLI Plus. Can anyone recommend me some settings? I have already looked into quite a few so yeah :/ Thanks in advance!

Okay, so with basics, have you:
* updated bios to latest version ?
* delided cpu ?

If so, what thermals are you getting on your cpu? Also what thermals are you getting on your vrms?

I think its worth nothing Z370 SLI plus have less power phases / vrms than higher models by MSI; even so, according to 8bauer, his chips can reach 5 ghz on any z370 board, so i guess, up to 5 ghz probably all boards can do it, although his cpu is quite good.

It could be an issue related to stable current / higher voltage + worse binned chip at limt frequency. I dont have it here but tom from oc3d posted a video were some mobos cant really go into 5.1 with an average chip while other motherboards manage to do it, and its related to beefier vrms.
post #1039 of 1300
So I am going to upgrade from my x99 5930k system finally. What ram is best for the 8700k? Should I pick up one of those 14-14-14-34 3200mhz kits? Should I go for a 3733mhz kit at 17-19-19-39? Should I go got the 4000 mhz kits? All kits are stupid priced so money is not an object since any 16x2 kit is stupid priced anyways and the 3200mhz kits cost the same as the higher speeds kits. I will be using the Maximus X Hero board. The Apex and Formula don't offer anything extra I should care about right? Oh I will also be buying either the 5.1 or 5.2 ghz binned 8700k from SL in case processor speed that high benefits from faster ram which I think it does kind of right?
post #1040 of 1300
Quote:
Originally Posted by RustySpoons View Post

I can get my 8700K up to 5.1GHz stable < 1.4V, I'm running it currently at 5.0GHz with 0 AVX offset and RAM @ 3200MHz,
I will try OC the ram a bit.

Currently 5GHz on a D14, Temps are 70-75 running a benchmark, @ 1.325v, will wind it back a bit as It seems stable at 1.3 or slightly below.

Annoying thing is I can't seem to hit 5.2GHz reliably, too scared to crank it up past 1.4v

Here is my CPU-Z validation:
https://valid.x86.fr/548b5v

Hi RustySpoons, the only DC mode capable fan header is CPU_OPT? I have some Nidec Servo Gentle Typhoons that shipped with PWM enabled but don't PWM well with a number of boards, it seems like moving the fans to CPU_OPT are the only workaround to avoid 100% RPM?
Project Nano
(9 items)
 
  
CPUMotherboardGraphicsRAM
i7-7700k Maximus VIII Impact NVidia GeForce GTX 1080 Ti Founders Edition G.SKILL Trident Z 16GB DDR4 (Black/White) 3200MHz 
Hard DriveCoolingOSPower
Samsung SSD 960 Pro 1TB Aquacomputer cuplex kry​os NEXT P​VD/nickel, k... Windows 10 Pro 64-Bit EVGA 650W P2 
Case
Fractal Design Nano S 
  hide details  
Reply
Project Nano
(9 items)
 
  
CPUMotherboardGraphicsRAM
i7-7700k Maximus VIII Impact NVidia GeForce GTX 1080 Ti Founders Edition G.SKILL Trident Z 16GB DDR4 (Black/White) 3200MHz 
Hard DriveCoolingOSPower
Samsung SSD 960 Pro 1TB Aquacomputer cuplex kry​os NEXT P​VD/nickel, k... Windows 10 Pro 64-Bit EVGA 650W P2 
Case
Fractal Design Nano S 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel CPUs
Overclock.net › Forums › Intel › Intel CPUs › i7 8700k overclock results and settings