c300 64GB problem

inogen · 2 May 2011 at 18:40

Hiya,

This drive is about 2 weeks old. Thought it was fine - using HD tune to bench it - I get max read speeds of about 300MB/s. Great I thought.

Then today I did an AS bench. Things do not look so good...

as-ssd-bench%20C300-CTFDDAC064M%2002.05.2011%2017-30-17.png

HD tune is still giving the same sort of results.(300MB/s ish max)

It's on an Asus P7P55D-E board with an onboard Marvell SATA III controller.

Any advice chaps?

inogen · 2 May 2011 at 19:01

just installed the marvell driver.

Makes it slower

as-ssd-bench%20C300-CTF%20DDAC064%2002.05.2011%2018-59-23.png

Mr Paul · 2 May 2011 at 19:07

Use the Intel SATA drivers. Rapid storage I believe they are called.

inogen · 2 May 2011 at 19:54

RST doesn't detect the drive at all...

Only detects the SATA drives which are on the Intel P55 SATA controller, not on the Marvell...

Mr Paul · 2 May 2011 at 20:10

Is the Marvell set to AHCI (or ACHI) mode?

inogen · 2 May 2011 at 20:58

Yeah - in BIOS the Marvell SATA controller is set to ACHI

& Marvell boot ROM to Enabled (it doesn't boot disabled)

inogen · 2 May 2011 at 21:00

I updated the BIOS this afternoon too.

Has made no difference.

Only updated slightly anyhow - nothing spectacular expected.

inogen · 3 May 2011 at 10:30

Is there anybody out there?

inogen · 3 May 2011 at 13:11

I've tried the drive on both the P55 Intel Controlled SATA connections and the Marvell, both are giving pretty much exactly the same speeds.

Are the AS results above right(ish) for a c300 on SATA II?

If so - I'm leaning towards the board being faulty. If not I'm leaning towards the drive.

edit - the 4k 4k-64Thrd results are better on the Intel SATA II.

edit - have contacted Asus - lets see what they say.

Silence is deafening from Asus. Crucial have been keen to help, but say they've never heard of this problem before.

inogen · 10 May 2011 at 10:55

Ok - well I heard absolutely nothing from Asus about this... except I was told that there's no phone support for motherboards outside the US... I've emailed them twice about this and got nothing at all back except automated emails...

Anyway - the culprit here it seems is bitlocker...

Unencrypted, the drive gets decent speeds (370Mb/s read)

Encrypted - it drops to 170Mb/s