nForce4-SLI, AHCI and NCQ and FreeBSD 6.0

O. Hartmann ohartman at
Thu Sep 8 04:51:32 PDT 2005

Are you really sure the onboard Sil SATA controller supports SATA II? 
When I studied the handbook of both motherboards, the A8N-SLI Deluxe and 
A8N-SLI Premium I found both motherboards are idetically equipted with 
the *not* SATA II capable SilI3114 SATA controller. By the way, as I 
know, the second SATA controller is attached via the PCI32 bus, not via 
PCIe! That means (in my opinion) there is no benefit using this 
controller. It is more a marketing GAG than a serious add-on.

RAID5 performance of ICH7R and SilI is said to be very, very poor (about 
10 MB/s read/write performance), so what benefit I do have using this 
controller with it's senseless 'capabilities' and non-PCIe attachment?

This is only a thought based on my personal available informations and 
maybe wrong ...


Malachi de Ælfweald wrote:
> I have noticed the same thing with the onboard Silicon Image controller. 
> I am using the A8N-SLI Premium. I am using the Silicon Image controller 
> instead of the nForce4 controller because it specifically said SATAII 
> and said it supported RAID5 (whereas the nForce did not support RAID5). 
> However, on boot it recognizes it as SATA150 (which should be SATA300).
> Malachi
> On 9/6/05, *O. Hartmann* <ohartman at 
> <mailto:ohartman at>> wrote:
>     Hello.
>     I have a little question about the popular nForce4-SLI chipset for the
>     Socket 939 platform. The onboard SATA controller of the nForce4-SLI
>     chipset claims to be NCQ (or SATA II) capable, but nVidia implemented
>     this feature in a not-AHCI-standardised way, but as an own solution. My
>     question is: Is the FBSD 6.X driver for the nForce4-SLI chipset capable
>     of using NCQ (as I know, the driver has to enable NCQ and it's not done
>     automatically by the harddrive-controller interaction).
>     Thanks in advance,
>     Oliver
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