Red flag on current SATA 6 Gbit/s!

senileoldgit · #1 21st September 2009, 03:39 PM

http://www.behardware.com/news/10424...-6-gbit-s.html

Quote:

The first problem is that the only SATA 6 Gbit controller available, the Marvell 88SE9123, only connects with one PCI-Express link. At best then, you get 500 MB/s, which is less than the theoretical speeds of SATA 6 Gbit/s, without counting the fact that this bandwidth will have to be shared between the two ports supported by the chip. At worst then, you’ll have 250 MB/s per port!

The second problem is that the additional PCI-Express lanes on the Intel chipsets don’t work at 5 GT/s but at 2.5 GT/s, even on the latest P55 Express. A simple design linking the Marvell 88SE9123 to the P55 Express will therefore limit it to 250 MB/s, which is less than the bandwidth you get with SATA 3 Gbit/s!

The P55 chipset connects to the CPU over DMI. I'll be back after seeing what bandwidth that has.

senileoldgit · #2 21st September 2009, 04:08 PM

Urgh? In the block diagram it says the connection to the CPU is 2GB/s.

http://techreport.com/articles.x/17513

From the Intel datasheet:

Direct Media Interface
— 10 Gb/s each direction, full duplex

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