On Jan 17, 2006, at 7:34 AM, Peter da Silva wrote:
I am honestly surprised that you get that kind of throughput on a
Powersurge motherboard through the PCI bus. The Powersurge PCI bridge
is notoriously bad, and I've seen claims that the available bandwidth
is as low as 17 MB/s. Are you sure that your measurements allow for
the disk cache?
Not sure how to factor in any of the variables .... I am reporting
Intech Speedtools QuickBench results which measure R/W speeds at
various size Read and Writes as I understand it. I am reporting the
visual average Extended test results: 20, 30, 40, ... 100 MB size files
R/W.
For an ATA drive ST380021A, on my PPC 8500, off a Sonnet Trio (IDE133),
I get around 19.5 MB/s.
For my SCSI drive ST150176LC, on my PPC 9500, off an ATTO PSC, which is
reported as an SX150176LC, that I bought off eBay, I get 22.5 MB/s
(from my memory).
Here are the full descriptions and links (if allowed) of my newer scsi
setup. Includes what terminator I have ... perhaps that is where I may
have a limitation on speed ... perhaps that is for a slower device 68
pin chain (SCSI III Ultrawide) ? and it causes my ATTO card to select
the slower speed?
ATTO ExpressPCI PSC SCSI Controller Card (comes with a 68 pin cable)
Model # 0042-PCBX-002
Working Pull from a Power Mac G3
External 68-pin Ultra Wide SCSI connector
Internal 68-pin Ultra Wide SCSI connector
Internal 50-pin Standard SCSI connector
More Information at:
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=8737209922&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1
Already have the following:
50gb SCSI SCA 50 pin fitted Mac Hard Disk Drive
Seagate Number ST150176LC
More Information at:
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&rd=1&item=5826915806&ssPageName=STRK:MEWN:IT
Additional SCSI adapters, terminators (at mcpb.com):
SCSI III Ultrawide Active Term 68pin-F
#TMA-I3HDB-68F $14.95 USD
SCA2 80Pin-68Pin LVD Rated Adapter
#SCA2-F80HP-68F-LVD $12.95 USD
Shipping, handling, and tax may be added upon checkout.
Amount $27.90 USD
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