ASUS_P5G41T-M LX Plus SATA3 card runs slow

[JoeMomma]

I had to replace my Socket 775 mb. The new Asus will not allow my SSD to run at full speed. I only get 200Mb/s and I used to get 500 w/ the old mb. I have tried 2 different PCI-e controllers with the same results.

 

[qazzi]

have you set AHCI in the BIOS?

 

[JoeMomma]

I can't find AHCI in BIOS. I assume it is running because the readme for the Marvell 91xx card says the card would not show in the device manager if it was not on. The card will not function w/o AHCI.
Is the PCI-express x1 slot on this mb too slow to handle SATA3?
Could it be because I have a SATA2 hd plugged in with my SATA3 SSD?
That shouldn't matter, right?

 

[JoeMomma]

oops

 

[JoeMomma]

have you set AHCI in the BIOS?

I can't find AHCI in BIOS

 

[Paul NZ]

So whats the question??

Do you want to know why the SATA 2 hdd is slow on the SATA 3 port? Or why the PCI-E SATA 3 card is slow?

If you plug a SATA 2 hdd into either it wont be as fast as SATA3. You'll have to buy a SATA 3 hdd

SATA 3 supports SATA 2, but it wont change SATA 2 speed to SATA 3 speed

 

[JoeMomma]

So whats the question??

Do you want to know why the SATA 2 hdd is slow on the SATA 3 port? Or why the PCI-E SATA 3 card is slow?

If you plug a SATA 2 hdd into either it wont be as fast as SATA3. You'll have to buy a SATA 3 hdd

SATA 3 supports SATA 2, but it wont change SATA 2 speed to SATA 3 speed

The question is why is the SATA3 SSD on the SATA3 PCI-e card running slow 188MB/s?

 

[Paul NZ]

And whats the brand/model of this card?? Are you sure its SATA 3?

 

[Calvin7]

P5G41T-M LX Plus has 1 x PCIe x16 and 1 x PCIe x1 that appear to be PCIe version 1 with a per-lane data rate of 250 MB/s and a transfer rate of 2.5 gigatransfers per second (GT/s). The PCIe 2.0 standard doubles the transfer rate compared with PCIe 1.0 to 5 GT/s and the per-lane throughput rises from 250 MB/s to 500 MB/s.

The motherboard has the Intel ICH7. The ICH7 (Base) chip does not support AHCI and not having PCIe version 2 will limit any PCI-e controller transfer rate.

 

[JoeMomma]

And whats the brand/model of this card?? Are you sure its SATA 3?

It is a IO Crest PCI-Express SATA III (6G) card with a Marvell 91xx controller.
I also had an AS Media card with same slow speed.
On my old mb I had a HighPoint RocketRaid card in the second PCIe-x16 slot and that was fast but the new mb only has one graphics card slot..
The card shows up during boot up as having a SATA3 connection to the ssd and a SATA2 connection to the hd.
During boot up / bios there is no way to change any bios settings of the card.

 

[JoeMomma]

P5G41T-M LX Plus has 1 x PCIe x16 and 1 x PCIe x1 that appear to be PCIe version 1 with a per-lane data rate of 250 MB/s and a transfer rate of 2.5 gigatransfers per second (GT/s). The PCIe 2.0 standard doubles the transfer rate compared with PCIe 1.0 to 5 GT/s and the per-lane throughput rises from 250 MB/s to 500 MB/s.

The motherboard has the Intel ICH7. The ICH7 (Base) chip does not support AHCI and not having PCIe version 2 will limit any PCI-e controller transfer rate.

I guess I need a new mb.
Thank you for the info.