Can't boot with XMP (2.0) Profile? (ASRock Z370 Taichi)

Spacez0r · May 16, 2018

Hi all,

I just got this board for my 8700k; ASRock Z370 Taichi.
I got this memory: Corsair Vengeance LPX C15 3000MHZ.

Now when i normal boot, so without any overclocking it's showing 2133mhz in CPU-Z
When i want to boot with the XMP profile 2.0 (3000mhz), it won't boot at all. It shows me that the pc tried to boot several times but there seems to be a error.

When i set the mhz speed manually at anything lower then 3000mhz, it boots. Not to mention the timings which are kinda big.

PS. Got the most recent BioS version.

Can anyone help?

Roland Of Gilead · May 16, 2018

Spacez0r :

how many DIMMS are you using? 2 or 4. If it's 4 you will not be able to get all four DIMMS running at full speed.

Spacez0r · May 16, 2018

I got a set of 2x8GB, why would it matter?

Roland Of Gilead · May 16, 2018

Two DIMMS populated will/should run at full speed.

Four DIMMS populated for most mobo's will run at a default max. Normally about 2933, but sometimes less. From my understanding it has to do with the memory modules being Single Rank/Dual Rank, and the size of the DIMM (ie 8gb or 16gb). I'd imagine also it has something to do with voltages on the SOC too. Some memory experts might be able to explain in better detail.

This might help to explain: http://www.legitreviews.com/amd-ryzen-single-rank-versus-dual-rank-ddr4-memory-performance_192960/5

With all of that said. because XMP profile isn't working, you can do it manually, just make sure to set the voltage and input the timings manually also. There will be a sticker on the side of the DIMMS. Note down the timings, and match them to your bios mem timings. Then you should be good to go.

You can use something like CPUz to get the timings/voltage for Jedec settings. So if the rated speed doesn't work, downclock to 2933 or 2666 or whatever and set the timings for jedec setting for the speed you want to try, until you get them to work. Sometimes you just have to keep playing around. You can see the different Jedec timings in CPU-Z under the SPD section. Just note them all down and try them.

So, if you can get them to run at 2933, and with the timings suggested by the manufacturer, then that's good enough and close enough to 3000mhz.

Also, specially for Intel systems, faster ram does help, but not in the same way it does on Ryzen systems. So having 2933 instead of 3000 will not lose you any relative performance apart from maybe a few points in a benchmark here and there.

Roland Of Gilead · May 16, 2018

BTW, you have a nice gaming system rocking there. And that's an understatement!

With the 8700k/1080ti/SSD/16gb of ram, it will eat everything thrown at it gaming wise and then some! Nice

Have you tried OC'ing the CPU yet? TBH there isn't any need to do it. At stock the 8700k kicks ass. I wouldn't even bother with OC'ing that system for a couple of years. Even then it will still destroy most tasks given to it!

Enjoy

Spacez0r · May 16, 2018

Roland Of Gilead :

Ikr! Haha that's why i made it, had a quite good system alrdy tho but i just wanted the best. Had i5-7600k @ 5,2ghz stable + 1060 and the same RAM.

Unfortuantley this 8700k doesn't seem as golden as the i5 was. Can barely hit up 4,8 @ 1.33v. Not delidded tho, i'm running it at all core boost (4,7) now at 1.28 stable 68 max.

Spacez0r · May 16, 2018

Roland Of Gilead :

Two DIMMS populated will/should run at full speed.

Four DIMMS populated for most mobo's will run at a default max. Normally about 2933, but sometimes less. From my understanding it has to do with the memory modules being Single Rank/Dual Rank, and the size of the DIMM (ie 8gb or 16gb). I'd imagine also it has something to do with voltages on the SOC too. Some memory experts might be able to explain in better detail.

This might help to explain: http://www.legitreviews.com/amd-ryzen-single-rank-versus-dual-rank-ddr4-memory-performance_192960/5

With all of that said. because XMP profile isn't working, you can do it manually, just make sure to set the voltage and input the timings manually also. There will be a sticker on the side of the DIMMS. Note down the timings, and match them to your bios mem timings. Then you should be good to go.

You can use something like CPUz to get the timings/voltage for Jedec settings. So if the rated speed doesn't work, downclock to 2933 or 2666 or whatever and set the timings for jedec setting for the speed you want to try, until you get them to work. Sometimes you just have to keep playing around. You can see the different Jedec timings in CPU-Z under the SPD section. Just note them all down and try them.

So, if you can get them to run at 2933, and with the timings suggested by the manufacturer, then that's good enough and close enough to 3000mhz.

Also, specially for Intel systems, faster ram does help, but not in the same way it does on Ryzen systems. So having 2933 instead of 3000 will not lose you any relative performance apart from maybe a few points in a benchmark here and there.

Thanks for your explenation!

I find it odd that XMP isn't working on such a mobo. XMP is right to save you effort, could a cmos reset help?
And since the RAM is 3000MHZ, i could OC it right? What would be the gain at max?

Roland Of Gilead · May 16, 2018

Yes, it worth doing a CMOS reset, and updating to the latest BIOS, if you haven't already (which I suspect you have )

On a Ryzen system the gains can be quite high. Going from 2400-3000 can have a performance increase of 10% in some tasks, and that includes gaming. Which is substantial. However, the effects taper off after 2933, but still improvements up to 3200mhz, but not much in the way of any real gains.

It's different on Intel systems though. OF course having fast ram and tighter timings will help, but doesn't necessarily translate to perceivable improvements.

Yes, you could OC the ram further. By how much is dependant on a number of factors. Airflow, voltage applied, timings etc.

Spacez0r · May 17, 2018

Roland Of Gilead :

So i tried a CMOS reset, nothing changed.
I grabbed the manual once again. I looked up XMP settings, and the manual said there should be a switch on the MOBO with on/off. Seemed it's for turning on or off the XMP ability.
I turned it on, unfortunately same error happened.
Changed the ram sticks to the other 2 mounts, did another CMOS and then it appeared as standard 3000mhz

Thanks for the help!

Roland Of Gilead · May 17, 2018

Spacez0r :

Bingo. Result

That can some times happen. Typically the DIMM slot closest to the CPU is populated first, so if you have DIMM slots 0,1,2,3 then you poultate 0 and 2, or 1 and 3. or whatever way the manufacturer sets that out.

Glad you got it sorted. Now I'm well jel!!!

Send me some screenies of the insane FPS you must be getting in games. Just don't rub it in okay!

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