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MAXIMUS Z790 DARK HERO - i9-14900K - G.SKILL Trident Z5 XMP 3.0 DDR5 8000MTs - can't use XMP

Level 11

My setup listed in the subject.  I updated the bios to 506 and I still only get 5700 MHz with my cpu when native is 6.0 GHz for this processor.

Everything is set to default / Auto.

My memory (F5-8000J4048F24GX2-TZ5RS 96gb) should run at 8000 MT/s using XMP profiles, but only running at 4700 MHz with AI Overclock Tuner set to Auto.  If I try XMP 1 or 2, it won't boot and restarts in Safe mode.

I wanted to see if anyone else is having these issues before I start trying different voltages / timings.

I was going to try manually setting the memory freq to 8000 and CL40-48-48-128 1.35V, which is what G.Skill advertises for my memory.  Not sure what to try for the cpu to get that at least at 6 GHz, and I was hoping to be able to OC higher.

Other hardware includes AIO Asus water cooler, Gen5 M2 and Strix GeForce RTX 4090 Gaming.

I want to take it slow so not to damage anything, thus posting here for some advice.

UPDATE:  Do not buy the Dark Hero, several have returned it because unable to get stable OC.  Instead, buy the Apex Encore and Corsair memory.

378 REPLIES 378

That statement is somewhat conflated, because XMP is in fact overclocking. Please bear in mind that testing the same CPU in two different boards with two different DRAM topologies doesn't tell you as much about the IMC capability, and is more a testament to the advantages of running on a more efficient layout

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Every board cpu memory are different. I give you option what I tweaked. I have 2 systems on this board and both are fine. one is with 13900 and another 14900.  And both have different bios settings to get them stable.  Set your memory on 5000mhz i try get your cpu stable first. use occt to test cpu.

Level 9

i was running a z690 Extreme board, i tried two 12th gen K cpu's in the board.

Neither would run XMP proofiles and i tried four differnet two stick sets of DDR5 - not one would run XMP and i tried two differnet CPU's

Then someone suggested that the IMC (Internal memory controller) on these Cpu's is the issue and often the issue when an XMP profile wont run.

Intel have refined the 10nm process now with the 14th gen and i was advised to buy one if i wanted to run an XMP profile in my z690 board. Lo and behold it works as it should and i have a two stick set of 64Gb running at 6400mhz on an XMP profile. The IMC may be occasionally weak even on 14th gen cpu's menaing the issue will prevail in some of them still. This is why they only garuntee 5600mhz.... Its out of order really.

DDR5 has not been a pleasant transtion at all to my mind

I9 14900K >ASUS ROG Strix RTX 4090 OC Edition
ASUS ROG PG35VQ @ 200mhz in 3440x1440
Trident Z RGB 64GB DDR5 @ 6400mhz
Samsung 980 EVO Pro M.2 x 5 off
NZXT Z63 Kraken AIO CPU Cooler
NZXT H700i + Hue 2 (Pubg Edition) - Heavily modified
Corsair M65 RGB Mouse
Corsair K95 RGB Keyboard

Level 9

I spend 2h tweaking bios today and I have managed  to run 14900kf overclocked with dark hero z790 and corsair 4x24gb ram on 7200mhz . All super stable.  So I thing its nothing wrong with motherboards. Its just required set bios right and good knowledge. I build over 500 systems all overclocked to the limit and I know what i'm doing .   Sorry but if you bought this motherboard you need to know you will spend hours to get it stable but it is possible.


It's great you have all this good knowledge, but can you share it?
I have asked you at least three times the significance of disabling Vmx and you have not answered it.

He has shared, by providing the five voltages, which are key for DDR5 as initial setting guess, on the previous page. Since each silicon is different, it takes time to tweak settings to go beyond the default 5600 for two and 4000 for four single rank modules. 

And turning off virtualization has been a general recommendation for memory and processor overclocking, both intel and Amd since Ddr4 or maybe even earlier. 

I’ve not once had to disable VMX to achieve stability, but there’s nothing stopping you from trying.

The main key memory voltages that aid stability have been covered several times in the thread.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Thanks, that is what I wanted to know that it is not essential to disable Vmx. 
I might try it incrementally from my last best voltage settings, but I am not going to start over and re-do my hours and hours of work.

I have shared what settings you need to tweak.  If you copy them this mean you don't know what you doing. This is only sample you need to spend  few hours to get what you need.  Default speed for ddr5 is about 5000mhz. Everything over this is overclocking. You asked me many times why I disable VMX. Why not ?  My clients don't use VMX so why this need to be on. You should disable everything on motherboard what you not using to get best possible results with overclocking. Is VMX helps with overclocking ? Sometimes yes.  If you thing you will buy expensive cpu and motherboard everything will be easy ? Absolute no.  This motherboard is designed for someone who like overclocking. it has so many options you can do anything you want.