If the card is ISA, you will be throttled to 8.33 MBps of throughput, but
if the card is PCI, that's another story. PCI runs at 133 MBps of
throughput. Of course, this bandwidth is divided amongst the different
cards in the system, e.g. one of these cards will want 66 MBps of
bandwidth, an ethernet card will want another 12.5 MBps (assuming a
100Mbps card), a sound card ( in full duplex mode, 16 bit stereo, 48 kHz)
will want another .384 MBps, etc.
If the total bandwidth of ISA cards is >8.33 MBps, you reach a state of
oversubscription on the ISA bus which may cause bottlenecks there.
Likewise, if the total bandwidth of ISA+PCI is >133 MBps, you reach a
similar state of oversubscription on the PCI bus (the ISA bandwidth is
added to the PCI bus on most MB's, AFAIK).
Before anyone asks me why a 100 Mbps ethernet card uses only 12.5 MBps of
bus bandwidth, please observe capitalization (as in all things UNIX) and
that b=bit, B=byte.
On Fri, 24 Mar 2000, Wandered Inn wrote:
> I understand that you can purchase a card that will enable you to use
> ata66 drives on a mb that does not support them. Question is, will I
> get the same throughput (or at least better), or am I wasting my time?
> I've got a pretty new mb, so I don't want to replace it.
>
> --
> Until later: Geoffrey                ">esoteric@denali.atlnet.com
>
> I'm afraid there will be more problems with W2K than there were with
> Y2K...
> --
> To unsubscribe: mail ">majordomo@ale.org with "unsubscribe ale" in message body.
>
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Glenn C. Lasher, Jr - Senior Engineer, Telecommunications/UNIX/Windows NT
Data Tech Associates, Ltd, 883 Broadway, Albany NY, 518.465.1190
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