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ROGBot
The 8700K (batch number L729C232) has been delidded and Thermal Grizzly Conductonaut has been used both over and under the IHS. I have so far only focused on the CPU overclock, so the memory is still running at the default 2133MHz.
At first I basically followed this guide from Raja: https://edgeup.asus.com/2017/kaby-lake-overclocking-guide/ and tried the Adaptive mode. After half a day of testing and trying, I just couldn't get it stable at 5.1GHz and even though I increased Vcore to 1.43v at one point, temps didn't really go up much either. They just hovered at around 65-68 degrees max.
So today I tried manual mode overclocking instead, and things changed quite a bit. I am now able to get a completely stable 5.1GHz OC. Temperatures went up as well, so I am thinking the Adaptive mode has a lot of vdroop and possibly some delay issues. A friend told me he has had a lot of similar issues on ASUS boards. Maybe a BIOS fix can do the trick?
Anyway, it's taken a bit to find what I think might be a proper vcore reading. CPU-Z shows a weird number, but the latest HWInfo beta, under the ROG MAXIMUS X HERO header has a Vcore reading that seems correct. When I set the Vcore to 1.35v manually in the BIOS, it shows around that number when idle, and then shoots up to 1.408v under max load. Is that normal? Is the reading wrong?
It's 2+ hour stable in Prime95 versions 27.9 and 28.10 as well as ROG Realbench 2.56 and the x264 stability test. Max temps on the cores for the latter three programs range from high 60s to mid 70s degrees, and up to 80 degrees on the hottest core in Prime95 27.9. During regular gaming temps stay in the mid-50s usually. I can actually push the chip to 5.2GHz except for core #3. It invariably fails in Prime95 while the rest truck on, so I guess that's my CPUs weak spot.
Here's a 2½ hour Prime95 screenshot. https://i.imgur.com/JIl3MGZ.jpg
At first I basically followed this guide from Raja: https://edgeup.asus.com/2017/kaby-lake-overclocking-guide/ and tried the Adaptive mode. After half a day of testing and trying, I just couldn't get it stable at 5.1GHz and even though I increased Vcore to 1.43v at one point, temps didn't really go up much either. They just hovered at around 65-68 degrees max.
So today I tried manual mode overclocking instead, and things changed quite a bit. I am now able to get a completely stable 5.1GHz OC. Temperatures went up as well, so I am thinking the Adaptive mode has a lot of vdroop and possibly some delay issues. A friend told me he has had a lot of similar issues on ASUS boards. Maybe a BIOS fix can do the trick?
Anyway, it's taken a bit to find what I think might be a proper vcore reading. CPU-Z shows a weird number, but the latest HWInfo beta, under the ROG MAXIMUS X HERO header has a Vcore reading that seems correct. When I set the Vcore to 1.35v manually in the BIOS, it shows around that number when idle, and then shoots up to 1.408v under max load. Is that normal? Is the reading wrong?
It's 2+ hour stable in Prime95 versions 27.9 and 28.10 as well as ROG Realbench 2.56 and the x264 stability test. Max temps on the cores for the latter three programs range from high 60s to mid 70s degrees, and up to 80 degrees on the hottest core in Prime95 27.9. During regular gaming temps stay in the mid-50s usually. I can actually push the chip to 5.2GHz except for core #3. It invariably fails in Prime95 while the rest truck on, so I guess that's my CPUs weak spot.
Here's a 2½ hour Prime95 screenshot. https://i.imgur.com/JIl3MGZ.jpg
Well dammit... Apparently I messed up the OC profiles or something, and the load line calibration I thought I had set manually was at Auto. That was a lot of testing at the wrong settings... Anyway, I set LLC to 6 and disabled Spread Spectrum as well for good measure, and I get this in Prime95 27.9. Still stable, showing lower vcore (1.344-1.360v) and also slightly lower temps than before during the 1 hour run.
Edit: And a 6 hour Realbench test over night. It's time to look at memory speeds.
Edit: And a 6 hour Realbench test over night. It's time to look at memory speeds.
lefteris82 wrote:
You achieved a superb OC 🙂
I can't get it stable at 5Ghz with Vcore 1.33 . I don't want to set higher voltage. I'm getting around 85+ oC at Prime95 and it crashes after a while.
Although I'm stable at 4.8Ghz with 1.30V . Tested 1 hour prime95 small FFTs and X264 encoding one hour and it passed.
My cpu is not delidded and using a corsair h115i with 4 fans push-pull at 1000rpm.
I didn't change any setting in BIOS except XMP in RAM, vcore and multiplier. Can you post your settings in BIOS ???? 🙂
Make sure you don't forget to set the load line calibration, like I did at one point 🙂 But you are definitely temperature limited compared to my delidded chip.
I currently have the RAM running at 3466MHz stable, but I am stuck there at that speed and with those primary timings until I know how far I can safely push VCCIO and VCCSA. I did an all-night 8 hour Realbench test as well, but forgot to screenshot it. The RAM settings are also both Memtest86 and HCI Memtest stable:
Here are the BIOS screenshots you asked for:
Extreme Tweaker main page
External Digi+ Power Control
Internal CPU Power Management
My DRAM Timings as well, but that's just if you happen to have the exact same RAM as me they are useful. But you should probably disable the MRC Fast Boot, as that allows your RAM to train and find the correct timings on boot.
I forgot to take a screenshot of it, but I also set the C-states to enabled instead of Auto.
Nerror wrote:
Make sure you don't forget to set the load line calibration, like I did at one point 🙂 But you are definitely temperature limited compared to my delidded chip.
I currently have the RAM running at 3466MHz stable, but I am stuck there at that speed and with those primary timings until I know how far I can safely push VCCIO and VCCSA. I did an all-night 8 hour Realbench test as well, but forgot to screenshot it. The RAM settings are also both Memtest86 and HCI Memtest stable:
Here are the BIOS screenshots you asked for:
Extreme Tweaker main page
External Digi+ Power Control
Internal CPU Power Management
My DRAM Timings as well, but that's just if you happen to have the exact same RAM as me they are useful. But you should probably disable the MRC Fast Boot, as that allows your RAM to train and find the correct timings on boot.
I forgot to take a screenshot of it, but I also set the C-states to enabled instead of Auto.
Hi all
can we expect see the come back of adaptive mode it was a good idea ?
Good OC, and yes, delidding is critical for stable working above 5GHz with 4 cores let alone 6.
