Slow transfer rate with PCIe gen4 x 4 NVMe with Intel VMD controler 14th gen CPU

[Kudju]

Hello Everyone.

im having a problem with a slow transfer rate (copy-paste) with Intel VMD controlled NVMe gen4 x 4.

I am having a problem with a newly bought Samsung NVME SSD 990 pro 4TB on my new Acer Predator Helios Neo 18 (Model Number: PHN18-71)

The problem consists of having a slow transfer rate (copy-paste) with Intel VMD controlled NVMe gen4 x 4.

I've upgraded the old Hynix 1TB with new Samsung one and got terrible transfer speeds when copy files. Its around from 50 to 500 MB/s going up and down.

I've read over Acer forum for a solution but most of them are vague or not working for me.

I've tryed installing Windows 11 in so many different RST driver configurations but in vain.

Tryed VMD on/off.

Tryed Raid0 as well.

The common between them is that i use the VMD driver to display the installed SSD's partitions. When trying DiskMark i see the 7k+ read and write speeds but when coppying real life files it is slow. Samsung magic software cannot detect the SSD when VMD is enabled but when i swotched it of it say the drive is Authentic and the firmware running is the latest.

Temps are between 45 at idle and 70-ish at load.

I've tryed the Full power mode from Samsung software - no change in transfer speeds.

I've tryed OverProvisioning from Samsung software - no change in transfer speeds.

I've tryed the windows power plan to be at max and PCIe to never be at power saving mode.

When VMD was on i've installed Intel RSD drivers in windows - No change in transfer speed.

When VMD was off i could not install the RSD driver - no supported device.

I've read also that NVME ssd has to be at AHCI mode if i dont want a RAID setup, but there is not such option in BIOS (BIOS version is latest 1.7)

The CPU is 14th gen 14900 HX so i installed the appropriate Intel RST drivers for it.

I'm out of options and i dont know what to do. Please if someone knows a fix, share it.

Any ideas are appreciated.

[JedG_Intel]

Hello Kudju,

Thank you for posting on Intel Community Forum.

For me to assist you properly, kindly help with the information below.

1. Are the slow transfer rates consistent across different types of files (e.g., large video files vs. smaller documents)?

2. Are there any background applications or processes that might be affecting transfer speeds?

3. Are other drives in the system experiencing similar issues, or is the problem isolated to the Samsung 990 Pro?

4. When you installed the Samsung 990 Pro, did you perform a clean installation of Windows 11, or did you clone the old drive?

I look forward to your response.

Best regards

Jed G.

Intel Customer Support Technician

[JedG_Intel]

Hi Kudju,

I sent you an email since I was able to see that you sent us one. Kindly check your inbox at your earliest convenience.

Best regards,

Jed G.

Intel Customer Support Technician