Theoretical limit of Hard drives on PCIE 2.0 card

xanderful

Honorable
Feb 17, 2012
3
0
10,510
My question has to do with creating lets say a RAID 0 on a PCIE 2.0 8x controller card, this card http://www.newegg.com/Product/Product.aspx?Item=N82E16816117214.

If I set up a RAID 0 with 4 SSD SATA 6.0 500 MB/S R/W hard drives, will I be limited by the SATA controller, or will I be able to take advantage of the speeds of the PCIE 2.0 bus? If so, how come? eitherway.
 
Solution
PCIe 2.0 has a 500MB/s per lane limit, so an x8 card would be 4000MB/s, see HERE.

SATA III transfers up to 6Bbps, or about 600MBps with overhead, see HERE.

So 4 SSDs saturating their SATA III connection would still not exceed the PCIe 2.0 specification by a significant margin. Even in the real world it doesn't appear that your peak rates would be hindered.

RealBeast

Titan
Moderator
PCIe 2.0 has a 500MB/s per lane limit, so an x8 card would be 4000MB/s, see HERE.

SATA III transfers up to 6Bbps, or about 600MBps with overhead, see HERE.

So 4 SSDs saturating their SATA III connection would still not exceed the PCIe 2.0 specification by a significant margin. Even in the real world it doesn't appear that your peak rates would be hindered.
 
Solution

xanderful

Honorable
Feb 17, 2012
3
0
10,510
Cool, I knew this I just had know way of proving it. I was not able to find anything on the internet about PCIe 2.0 Specs and lane limits. All I found was information saying that it had a 6Gb/s limit which did not make sense.