NEC D720200A PCIe - Slow transfer speed

[kyriacos]

Installed pcie card with NEC D720200AF1 chip, installed latest RENESAS Gen1 drivers (v2.1.39.0), but transfer speed is slow (30-35MB/s). Same speed with Windows (Microsoft) drivers. Any ideas why?

[MeatWar]

@kyriacos

NEC D720200AF1

PRODUCT BRIEF

Firmware
Renesas/Nec uPD720200/720200a

Drivers
[Outdated] USB 3.0/3.1 Drivers (original and modded) - Important Drivers / General: Storage Drivers (AHCI/RAID, NVMe and USB) - Win-Raid Forum

[kyriacos]

I am not sure about the firmware, but I already tried the latest drivers. But I found that others have the same problem:

Renesas uPD720200 USB 3.0 slow transfer (29MB/s) on Windows 10

Hi guys, I have a problem with 2 of the 4 rear USB 3.0 ports from my ASrock X58 Extreme6 motherboard (latest bios 1.60c). The upwards ports works perfect and have a transfer rate around 150MB/s. With the two other (underneath) I get stuck slow at around 29MB/s. The chips are Renesas/NEC uPD720200 revision 3 and are flashed with latest 3.0.3.4 firmware. I tried both Windows 10 native drivers and 2.1.39.0 (from 2012) Renesas drivers. Is there something I can do to fix this ?

[kyriacos]

I found this topic [Guide] Flashing and Updating Renesas/NEC USB 3.0 uPD720200AF1/uPD720200A Firmware about flashing firmware, but I read conflicting information. Is there anyone here that successfully flashed firmware on such a card and can help?

[kyriacos]

A different card with NEC D720202 chip works fine and write transfer speed is around 100MB/s. The card with NEC D720200AF1 chip has 3.0.3.4 firmware, but newer flasher 4.0.2.1.0.3 does not work with it. Any ideas what to do with it?