--- Ruben Lopez <[EMAIL PROTECTED]> wrote:
> But is there a performance hit for using an add-on
> card as opposed to onboard RAID support?
It depends on how good the controller card is and how
the onboard controller is interfaced to the rest of
the hardware.
If the onboard controller is on a 64bit PCI bus (and
is good enough to take full advantage of it) but the
board doesn't have any 64bit PCI slots, then no PCI
controller could exceed the performance of the onboard
one.
That would be a rare case, and PCI Express is pushing
out 64bit PCI- which never gained a toehold outside
the server market and some PowerPC models of
Macintosh.
What's hot right now are SATA RAID controllers, either
onboard or on cards. I have an Intel motherboard with
six SATA ports that can be configured in various RAID
types. Another PC I have has four SATA ports and two
IDE ports that can all be used together to run up to
eight drives as a RAID array. (It sees them all as IDE
drives on four IDE controllers.)
I'd love to see Apple produce a MacPro with a pot full
of SATA ports onboard, but it's not likely given their
history. The most expandable Mac ever was the PowerMac
9500/9600 with six PCI slots, a number of slots never
seen since in a Mac. Apple was >thisclose< to
production of the "Power Express" which had the
capacity for huge amounts of RAM and was the only
computer Apple ever made (other than their servers
that didn't run Mac OS) with Wide SCSI on the
motherboard.
Power Express got axed at the last minute in favor of
the Beige G3 desktop, Minitower and AIO models with
their paltry 3 PCI slots and screwed up IDE support.
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