Precision 5510: Very slow SSD performance

What happened when you tried disabling Legacy in BIOS? Would it not boot or did it not make a difference?

Sorry, what part of that process using the OCZ driver did not work? Could you not change to AHCI without re-installing OS? If so, does that mean you've not yet tried the OCZ driver because unable to boot using AHCI?

 

How to force the OCZ driver to install is explained somewhere in the XPS forum. The driver doesn't want to recognise the SSD but once installed it works fine.

But first you might want to try this suggestion about write caching.

John

 

You can't flip/flop between UEFI mode and legacy mode in the BIOS. Windows will fail to boot if you change it from whatever it was set to when you first installed Windows.

Unless you want to spend time mucking with the partition table. UEFI requires a GPT-formatted partition table, while legacy requires an MBR-formatted partition table, and switching between the two is not trivial.

 

Ah ty. Ive only switched between legacy when booting from usb thumb drives during backup restore. I'll humbly leave the game now for pros to diagnose.

 

Today I am going to try to disable legacy mode

It BSODd.

As a a matter of fact, the only way I fixed it was using the last known good configuration.

I have not been able to change to AHCI yet. Ive tried registry tweaks but they seem to fail and I can get it only to work on RAID.

Technically, yes.

I dont mean this in a bad or wrong or rude way but I cant be searching all day at my workplace to fix a problem at work. This laptop is for work BTW. I need solutions now like the link you gave me about write cache.

Thank you.

Right now, its booting using UEFI. There should be no issues disabling legacy boot.

I would have to confirm but Im pretty sure that both partition tables on the SSD and HDD are GPT.

Right now, Im going to work and reimaging the machine. Ill try the suggestions marked here and if not, we will (try) to replace this laptop with a Zbook or a P50. I just dont understand that if the NVMe is not supported under Windows 7, why would Dell sell it...

 

Here's another reference about the RAID to AHCI switch which mentions an extra step. It might be worth trying.

And did you try changing the write caching settings?

John