Re: IDE controller performance

From: John-Paul Stewart (jpstewart_at_binaryfoundry.ca)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 13:13:31 -0400

Richard Kimber wrote:
> I currently have 2 disks on one IDE channel and a dvd recorder as master
> on the second.
>
> I want to separate the disks and give them a channel each. I'm thinking
> of buying a Promise ultra-ata 133 card.
>
> It would be easiest for me just to put the dvd on the first IDE channel of
> the card, and put the slave disk as master on the old DVD channel. That
> would seem to involve the least amount of re-configuration.
>
> I've seen suggestions (can't remember where) that there would be a
> performance advantage in having the disks on the PCI controller rather
> than on the M/B. Can anyone confirm this?
>
> M/B is MSI K8T Master2-FAR with 242 opterons.

The only time I could imagine there being a performance advantage to the
PCI card is if it were newer and faster than the IDE on the motherboard.
  For example, if the motherboard supported only Ultra-66 mode while the
card (and disk) supported Ultra-133 mode, then I would think the PCI
card might offer some advantage. However, as long as the motherboard
supports the highest speed the disk can offer, I don't see how a PCI
card could offer any advantage.

One thing to be ware of though, is that some add-in PCI cards don't
support the full ATAPI protocol; they are for hard disks *only*. Check
into that before you buy if you really feel the DVD must be attached to
the add-in card.

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