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PCI-e 2.0 vs PCI-e x4 slot

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December 12, 2011 12:39:05 PM

Ive bought a PCI-e SATA3 adapter so that I can utilize the full (or as much as possible) bandwidth of my new SSD which is currently running on SATA2 to my motherboard.

My mobo (Asus P6T Delux v2) has a PCI-Express x4 slot available. Is it possible to use this slot for the adapter Ive bought, or does it have to be connected to a PCI-e 2.0 16x slot?


Thanks

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a b V Motherboard
December 12, 2011 12:58:58 PM

PCIe is wonderfully backwards compatible, your PCIe2 card will work just fine in a PCIe1 slot (as long as it is a slot as big or bigger than the card you purchased). It will just run at a slower speed, which is 256MB/s per lane instead of the PCIe2 standard of 512MB/s per lane. In the case of a PCIe1 4x slot it would be 1GB/s which should be faster than a single SSD, but may be a slight bottleneck if you are doing a RAID0 on 2 fast SSDs.
December 12, 2011 2:16:48 PM

which card exactly do you own?
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December 12, 2011 2:47:01 PM

CaedenV said:
PCIe is wonderfully backwards compatible, your PCIe2 card will work just fine in a PCIe1 slot (as long as it is a slot as big or bigger than the card you purchased). It will just run at a slower speed, which is 256MB/s per lane instead of the PCIe2 standard of 512MB/s per lane. In the case of a PCIe1 4x slot it would be 1GB/s which should be faster than a single SSD, but may be a slight bottleneck if you are doing a RAID0 on 2 fast SSDs.


Ok cheers, Looks like I'll use one of the free PCI-e 2 ports then just to make sure theres enough bandwidth. I did read somewhere that PCI-e x4 is capable of around 1000mb/s and that should be enough to the cover the 600mb/s that SATA 3 is capable of, is that correct?

we1shcake said:
which card exactly do you own?


This is the adapter I have

December 13, 2011 7:00:15 PM

with that card just whack in any pcie slot, itll work in any of em even a x16
December 14, 2011 11:32:02 AM

Yeah, Ive got it in the PCI-e 16x slot and the drive is now giving me read speeds of just over 350 mb/s
The write speed is pretty poor in comparison but that seems to be a failing of the 128gb C300. The larger drives have higher writes.
December 15, 2011 3:24:43 PM

as thats only a x1 card i believe that limits it to about 500mbps each way, with overhead and other things that 350 sounds about right
!