X99 WS applies XMP Profile with incorrect voltage
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=2324
Printed Date: 18 Jul 2025 at 9:23pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X99 WS applies XMP Profile with incorrect voltage
Posted By: GuruNot
Subject: X99 WS applies XMP Profile with incorrect voltage
Date Posted: 29 Mar 2016 at 12:23am
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I am using the following RAM in my X99 WS (BIOS 3.10): Vengeance® LPX 32GB (4x8GB) DDR4 DRAM 2666MHz C16 Memory Kit - Blue (CMK32GX4M4A2666C16B) Specs of which are: Warranty Limited Lifetime Fan Included No Heat Spreader Vengeance LPX Memory Configuration Dual / Quad Channel Memory Series Vengeance Memory Type DDR4 Package Memory Format DIMM Package Memory Pin 288 Performance Profile XMP 2.0 Memory Size 32GB Kit (4 x 8GB) SPD Latency 15-15-15-36 SPD Speed 2133MHz SPD Voltage 1.2V Speed Rating PC4-21300 (2666MHz) Tested Latency 16-18-18-35 Tested Speed 2666MHz Tested Voltage 1.2V My X99 WS detected two XMP Profiles, one for 2666Mhz @ 1.2V and the other for 2800Mhz @ 1.35V. Up until today I had been running it at normal SPD, but I decided to enable the first XMP Profile to make it run at 2666Mhz. So I went in to "OC Tweaker" --> DRAM Configuration and loaded XMP Profile 1 (2666Mhz) , saved settings, rebooted and went immediately back in to bios (I read somewhere that if you dont go back in to bios the PC may hang). The machine reported that the RAM was running at 2666Mhz, timings were correct 16-18-18-35, but the main DRAM voltage was at 1.35V. This seems to be at odds with the XMP Profile:  I manually adjusted the DRAM voltage to be 1.2V , saved and rebooted and all still seems fine:  The BIOS obviously read the profiles ok from the DIMMs as they are displayed correctly, but it seems to have implemented the DRAM voltage incorrectly. Did I miss something? I was a little concerned as 1.35V is the upper limit for the memory. ------------- Intel Core i7 5930K | ASRock X99 WS | 32GB Corsair Vengeance LPX EVGA GTX 980 Ti Classified ACX 2.0+ | SM951 M2 NVMe | QPAD MK-85 DeathAdder Chroma | Phanteks Enthoo Primo | AX860i | Win 10 Pro x64 |