Tema: Re: pagrindinė plokštė LGA1155 + 4xSATA3
Autorius: MRT
Data: 2014-04-14 14:35:47
> čia jau sudėtinga :)
> p.s. tai kaip galvoji gali greitis siekti didesni nei (blue) su šituo adapteriu Asus U3S6?


https://www.asus.com/Motherboards/P8H77M_PRO/specifications/
Expansion Slots
1 x PCIe 3.0/2.0 x16 (blue)
1 x PCIe 2.0 x16 (x4 mode, black)
2 x PCIe 2.0 x1

Va matai, tas apatinis yra "x4 mode", t.y. to lizdo pralaidumas 500*4=2000MB/s

https://www.asus.com/Motherboards/U3S6/specifications/
PCI Express x4 interface
Compatible with PCI Express x4, x8, and x16 slots
True SATA 6Gb/s & USB 3.0: Native support PCIe Gen2 bandwidth

Sita plokste pati originaliai yra PCIe Gen2 (o ne kokia PCIe 1.X, kur 250MB/s per lane)
Ji pati tures 500*4=2000MB/s ... kiek gerai dirbs jos chipset'ai, kurie sukuria SATA3 ir USB3.0 jau kitas reikalas.
Reklama ta pati sako: https://www.asus.com/websites/global/products/lGYmelQ8mJvPtYTv/p02.jpg


Cia randu kritikos.. todel ir si plokste lieka po nemazu klaustuku:
http://ntsblog.homedev.com.au/index.php/2012/02/23/asus-u3s6-review-benchmark-sata-3-add-on-card-sata-ii-onboard/

The U3 = USB 3.0 with a NEC chip set; and
The S6 = Sata III 6.0Gb/s Marvel 88SE9123 controller.
Why so slow?
So when I start it up I see the following
PCIe x1 5.0Gbps. x1 why x1, its a x4 card running in a x8 slot?
After some digging I found this spec document on the controller,
Marvell 88SE91xx Product Brief. If you read this the spec fo the controller shows this..
The controller only supports a single x1 connection.

I feel a bit duped. I specifically got this card for its x4 connection, but given the fact the marvel controller only accepts a x1 
connection the SATA will only ever be able to run at this speed. I have read other people suggest that the x4 is used to split the 
channel in half and use some of the x 4 bandwidth for the USB 3.0 controller, which would make sense but it seems like false 
advertising to me.