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BitForce SC - release notes
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Topic: BitForce SC - release notes (Read 12955 times)
mrb
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Re: BitForce SC - release notes
July 26, 2012, 04:02:07 AM
#161
RHA:
or
BFL will perhaps use a "Y" USB cable to draw twice the power, like some USB optical disk drive do:
http://www.cyberdata.net/products/cables/specialty/images/usb-b_2y_usb-a.gif
This would allow 5W for a Jalapeno, or 700 Mhash/Joule...
Inspector 2211
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Re: BitForce SC - release notes
July 26, 2012, 05:06:34 AM
#162
On a typical motherboard, a USB port is fused with a 1.5 Amp fuse.
Plenty of headroom.
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SgtSpike
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Re: BitForce SC - release notes
July 26, 2012, 05:12:33 AM
#163
Quote from: Inspector 2211 on July 26, 2012, 05:06:34 AM
On a typical motherboard, a USB port is fused with a 1.5 Amp fuse.
Plenty of headroom.
Are the thin little circuit traces on the motherboard also capable of delivery that 1.5 amps though? You could burn out a trace going that far beyond spec if the manufacturer didn't account for it.
Inspector 2211
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Re: BitForce SC - release notes
July 26, 2012, 07:13:08 AM
#164
Motherboard designers are not dumb. If it's fused with a 1.5 Amp fuse, the fuse will blow before the trace burns through or the motherboard incinerates. That's precisely why the fuse is there in the first place.
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This is not OK.
Re: BitForce SC - release notes
July 26, 2012, 04:40:56 PM
#165
Quote from: Inspector 2211 on July 26, 2012, 07:13:08 AM
Motherboard designers are not dumb. If it's fused with a 1.5 Amp fuse, the fuse will blow before the trace burns through or the motherboard incinerates. That's precisely why the fuse is there in the first place.
Else it's pretty fucking useless fuse!
SgtSpike
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Re: BitForce SC - release notes
July 26, 2012, 07:13:50 PM
#166
True, I was just thinking of the el cheapo motherboards where they might put a 1.5 amp fuse on it to look good on the outside, but it won't actually run that much. At least, I've seen similar things happen on other cheap electronics.
Is a fuse for a USB port typically only for one port or two?
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