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General Hardware Discussion Hard drives, CD, DVD Monitors, All hardware questions not better served by our other Topics

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Old 27th October, 2001, 06:46 PM
OddOne's Avatar
Join Date: September 2001
Posts: 16

Rounded SCSI cables and aggressive OCing...

Okay, this might be amusing to the oldschool OCers here that push their systems to the breaking point (like me!)...

I moved my machine from full tower to rackmount, and in doing so added a rounded SCSI cable to help neaten the internal wiring. Worked nicely.


I found that my stable OC limit dropped from 148 FSB (1035 MHz out of my P3-700) to 144 FSB (1008 MHz), with all other aspects of the system unchanged except for that cable. By "stable," I mean that the system can run all existing common benchmarks (3D Mark 2001, Sandra 2001, etc.), games, and burn-in/system-abusing apps (CPUburn, SETI@Home, etc.) without crashing statistically more often than the same box does at stock speed.

I yanked the rounded and swapped my flat cable back into the box, and poof, right back to 148 FSB. Now if I could only get my PCI cards to handle a >36.5MHz PCI bus I could go higher - this chip will post at 160 FSB (1120 MHz) if nothing's in the box but the video card.

At any rate, the nutshell is this: rounded SCSI cables in particular can have a surprisingly bad impact on the safe overclocking potential of a system, far more obviously than rounded ATA cables do.

Anyone wanna buy a perfect-condition rounded SCSI cable?

O d d O n e
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Old 27th October, 2001, 07:13 PM
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Join Date: September 2001
Location: San Clemente, CA
Posts: 554


Wonder if there's some multi-wire induction happening in the cable because of the long parallel runs?

Of course, all things being equal, I would suspect a bad cable first... and as a side note of the above, perhaps bad shielding as insulation demands would certainly increase in a rounded environment...

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