DDR4 do not reach native frequency in ASRock Fatal
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=8259
Printed Date: 06 Aug 2025 at 9:44am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: DDR4 do not reach native frequency in ASRock Fatal
Posted By: Iced Soul
Subject: DDR4 do not reach native frequency in ASRock Fatal
Date Posted: 02 Apr 2018 at 7:24am
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Hello guys. I am facing a problem with my DDR and would like your help in solving it. I bought 32GB of RAM, 4 x 8GB, G.Skill Trident Z RGB 4266mhz (F4-4266C19D-16GTZR). But I can not get them on the native frequency. I got a maximum of 3866mhz, with 2-DIMM (16GB) and f 4-DIMM. I'm using a 8700k at 4.8mhz, with cache at 4450mhz and BCLK at 103,250. CPU Vcore is at 1.23v. My mobo is an ASRock Fatality Gaming Professional. I saw videos on youtube and reports in forums that the guys are getting good overs in RAM with this model and in Taichi. ASRock reports up to 4333mhz of frequency supported on its QVL, including a model exactly like mine (F4-4266C19D-16GTZR). In the memories I got to set 1.5v, I raised the VCCIO to 1.4v and VCCSA to 1.45v, but I did not succeed. My BIOS is upgraded to P1.70 I would like your help for an eventual solution that I have not yet taken. Thank you .
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Replies:
Posted By: badbri
Date Posted: 02 Apr 2018 at 9:26am
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" rel="nofollow - The ram QVL lists are for ram running on a stock motherboard and if you read the notes on the QVL page it says: Note3: The O.C. mode is not guaranteed. It depends on whole system configuration and other parameters. Have you tried running the CPU, cache and Bclock at stock frequencies ? I think because you have overclocked everything you are getting as fast speed off the ram as you can get. Is the ram timing set at: 19-19-19-39 ? you may want to up each by one and see if that helps.... ------------- https://www.passmark.com/baselines/V9/display.php?id=99573335296 |
Posted By: Iced Soul
Date Posted: 02 Apr 2018 at 9:17pm
Hello Friend. Thanks for the tip. I took this stock test after your post. Nothing has changed. The latencies are as you described. I climbed about 5 points in each, but I did not succeed. I did not want to use very high latencies. For the price I paid in these DDR4, it would be psychological torture to use them nervously. I'd rather sell them or try another motherboard from another brand. |
badbri wrote:Posted By: mobiuus
Date Posted: 03 Apr 2018 at 6:32am
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hi! i have gaming k6 and bought 4x8 gb corsair dominator platinum, i switched on the motherboard little xmp switch to on and ram booted xmp profile 4000mhz and all is working fine...im on bios 1,30 my cpu is 8700k clocked to 4.9ghz at 1.35v fixed voltage... anyway i did not have to do anything with ram voltages... so try xmp switch on motherboard or update bios to 1.80 it says it improvees mem compatibility
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Posted By: mobiuus
Date Posted: 03 Apr 2018 at 6:35am
| also at such high mem xmp overclock u WILL habe to up cpu voltage...it would be best that u first try loading xmp profile with default cpu frequency and voltage and if its a success then do cpu oc... |
Posted By: Iced Soul
Date Posted: 04 Apr 2018 at 12:50am
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Hello Friend. Where you saw the 1.8 BIOS available. For me, only version 1.7 is appearing. I already tried with everything in stock and only the XMP profile loaded. I did not succeed.
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Posted By: ssateneth
Date Posted: 04 Apr 2018 at 4:49am
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You have to keep in mind, the highest official RAM speed of the i7-8700k is 2666MHz. Anything past that is overclocking and not guaranteed, even if the motherboard supports a higher speed and the RAM kit is a higher speed. It all comes down to the common denominator, which is the 8700k official ram speed. If you weren't getting the official ram speed, then that is cause for getting a repair or replacement. I'm in the same boat (tridentz 4266 19-19-19-39 kit) but I'm not complaining because I understand the risks of overclocking. I can get 4000MHz RAM running fine, boots every time. Anything higher than that has an extremely low chance of POSTing, but if it does POST, it POST's every time after that. But I'm heavily into changing RAM timings too, so if I use a RAM timing that is bad, it'll fail RAM training and I'm back to square one of trying to get the RAM to post at a speed higher than 4000MHz. Maybe you should concentrate more on modifying timings at the highest possible speed. After all, it's still a great kit. While I can't get 4266 working reliable, I have 4000 working at CAS16 at a reasonable 1.5v. Also, most of my RAM speed improvements come from an aggressive tRFC and tREFI, as well as minimizing all tRDRD, tRDWR, tWRRD, and tWRWR timings, especially tWRWR timings. The auto timings of tWRWR are very loose, and minimizing those timigns hugely increases the speed of sequential writes. I gained 50% write speeds minimizing my tWRWR timings (41GB/sec -> 60GB/sec) ------------- MB: X399 Taichi, UEFI L3.32 VGA: EVGA 1080 Ti FTW3 PSU: Seasonic PRIME 1300 W PLATINUM CPU: AMD Ryzen Threadripper 2950X MEM: 4x16GB, 3600MHz G.Skill Trident Z F4-3600C17Q-64GTZKW |
Posted By: Iced Soul
Date Posted: 04 Apr 2018 at 5:20am
| " rel="nofollow - Hello Friend. Thanks for the answer. Could you post the timings you could get? or even other BIOS settings. I can not get past 3866mhz. If I got 4000mhz it would be pretty good. |
Posted By: ssateneth
Date Posted: 04 Apr 2018 at 2:52pm
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It depends on CPU capability. It all really seems to boil down to VCCSA, VCCIO and to a lesser extent CPU Core voltage. Sometimes you just can't get RAM to train at high speeds, and that's just the nature of the beast. Try a speed that you knows works good for you and just decrease voltage of VCCIO until it no longer POSTS, then bring it back to the previous voltage. Do the same for VCCSA. Then you'll have an idea of what to run at. If you want to try higher speeds then, work from there. Immediately injecting 1.4v to both rails is not good (unless you just want to get the system to POST at all, then start dropping voltages if you do get a success). Working on RAM takes a long time since stability testing can take a logn time, especially if a timing you are working on throws very rare random errors ------------- MB: X399 Taichi, UEFI L3.32 VGA: EVGA 1080 Ti FTW3 PSU: Seasonic PRIME 1300 W PLATINUM CPU: AMD Ryzen Threadripper 2950X MEM: 4x16GB, 3600MHz G.Skill Trident Z F4-3600C17Q-64GTZKW |