Why is my Vector 150 so slow?

[drnebulous]

170MB/s write and 255MB/s read

I was expecting it to be more like 500MB/s write and 1GB/s read.

Is this normal?

 

[simsaladimbamba]

OCZ themselves says up to 550 MB/s read speeds and 450 MB/s to 530 MB/s write speeds the bigger the SSD is, thus 1 GB/s is out of the question, especially since S-ATA 6.0 Gbps (S-ATA III) does not provide that.
If you have a Mac Pro without S-ATA 6.0 Gbps (S-ATA III) card, you are limited to S-ATA 3.0 Gbps (S-ATA II) or even S-ATA 1.5 Gbps (S-ATA I) depending on your model, but it seems you are at S-ATA 3.0 Gbps (S-ATA II) due to your reported speeds.

 

[h9826790]

1) Why you expect 1G read speed?

2) How you test it?

3) How you install the SSD? e.g. Just plug it into one of the HDD bay.

4) Is TRIM enabled? Even though you connect the SSD via SATA 2, I still expect a better write speed.

 

[drnebulous]

1) Why you expect 1G read speed?

2) How you test it?

3) How you install the SSD? e.g. Just plug it into one of the HDD bay.

4) Is TRIM enabled? Even though you connect the SSD via SATA 2, I still expect a better write speed.

1. I'm note sure! I at least expect 400MB/s
2. BM Disk Speed Test
3. Yes, plugged into one the hard drive bays.
4. I don't know what that is?

 

[EvilMonk]

Because it was dropped on the head when it was still a kid?

 

[h9826790]

1. I'm note sure! I at least expect 400MB/s
2. BM Disk Speed Test
3. Yes, plugged into one the hard drive bays.
4. I don't know what that is?

You won't get anything higher than 255MB because you plug that in the HDD bay which is a SATA 2 port. You already hit the speed limit.

The writing speed may be further limited by lack of TRIM support.

 

[drnebulous]

You won't get anything higher than 255MB because you plug that in the HDD bay which is a SATA 2 port. You already hit the speed limit.

The writing speed may be further limited by lack of TRIM support.

I've just researched trim and enabled it via Trim Enabler and it's the same. Which pci data 3 card would be best?

 

[EvilMonk]

You won't get anything higher than 255MB because you plug that in the HDD bay which is a SATA 2 port. You already hit the speed limit.

The writing speed may be further limited by lack of TRIM support.

On a Apricorn Velocity X2 SATA 6G PCIe card in my Mac Pro I hit 540mb/s in read and 420mb/s in write... In my Mac Pro SATA2 ports it hit 253/256 so it would make sense...

 

[simsaladimbamba]

Can you provide the Model Identifier of your Mac Pro?

 

[EvilMonk]

I've just researched trim and enabled it via Trim Enabler and it's the same. Which pci data 3 card would be best?

Apricorn Velocity X2...
http://www.apricorn.com/vel-solox2.html

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Can you provide the Model Identifier of your Mac Pro?

Mac Pro 2010 12 cores... its in my signature.
I have 2 of these cards in raid 0 and get around 1Gb/s in read and 850mb/s in write.

 

[drnebulous]

Fantastic! Thanks everyone!

 

[simsaladimbamba]

Mac Pro 2010 12 cores... its in my signature.
I have 2 of these cards in raid 0 and get around 1Gb/s in read and 850mb/s in write.

Sorry, I meant the OP. But since all Mac Pros have S-ATA 3.0 Gbps (S-ATA II) at least, maybe it is the SSD having a problem?

 

[drnebulous]

Sorry, I meant the OP. But since all Mac Pros have S-ATA 3.0 Gbps (S-ATA II) at least, maybe it is the SSD having a problem?

So is it too slow for sata 2? My mac pro is a mid 2012 3.2Ghz Quad

 

[EvilMonk]

So is it too slow for sata 2? My mac pro is a mid 2012 3.2Ghz Quad

Depends, wouldnt say slow... Some SSD really need Sata 6Gbps to shine...
You have SSDs that are really fast in read and slower in write also.

 

[drnebulous]

Depends, wouldnt say slow... Some SSD really need Sata 6Gbps to shine...
You have SSDs that are really fast in read and slower in write also.

Ok then, I'll try the pci thing you recommended. Thanks again!