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Date: Sat, 18 Jun 2005 08:08:01 +0800
From: David Xu <davidxu@freebsd.org>
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To: Jarrod Martin <jmartin37@speakeasy.net>
References: <20050604234246.G69694@zoraida.natserv.net>	<200506071749.28840.groot@kde.org>	<20050617081853.GG1485@dragon.NUXI.org>	<200506180051.17505.groot@kde.org>
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Cc: freebsd-amd64@freebsd.org
Subject: Re: Which motherboard for RAID in AMD64?
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Jarrod Martin wrote:

> Adriaan de Groot wrote:
>
>> On Friday 17 June 2005 10:18, David O'Brien wrote:
>>  
>>
>>> On Tue, Jun 07, 2005 at 05:49:28PM +0200, Adriaan de Groot wrote:
>>>   
>>>
>>>> Lots of motherboards have two RAID controllers on board. See, the VIA
>>>> KT800 chipset has one and some vendors add a second, like a 
>>>> promise, for
>>>> added value. 4 SATA connectors on the motherboard, on two different
>>>> controllers.
>>>>     
>>>
>>> Why do so many motherboard manufacturers do that?  Is the SiI or 
>>> Promise
>>> RAID controller ready better than the VIA one?
>>>   
>>
> no... it isn't.  you can read most of the motherboard reviews and 
> learn that the performance increases are slim to none for the 
> secondary SATA controller.  in fact performance on the included SATA 
> controller is normally better (but by a negligible amount).
>
Secondary SATA normally is connected by PCI which has limited bandwidth
and longer latency when comparing with chipsets built in SATA controller,
Don't know how well a PCI-e based SATA controller will perform.

David Xu