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Title: Powered PCIE risers with capacitors Post by: LordShanken on June 24, 2013, 07:04:27 PM Hello,
I currently use powered risers with capacitors for my mining rigs, but now I heard that those risers are a fire hazard. Is this true? If yes - how can I remove them? I didn't care about capacitors, I just bought powered risers and recognized later, that they were a little different. I would be glad if someone can help me. Title: Re: Powered PCIE risers with capacitors Post by: razorfishsl on June 25, 2013, 12:22:41 AM Hello, I currently use powered risers with capacitors for my mining rigs, but now I heard that those risers are a fire hazard. Is this true? If yes - how can I remove them? I didn't care about capacitors, I just bought powered risers and recognized later, that they were a little different. I would be glad if someone can help me. Please supply a picture of one of the following:
holding one of the risers Title: Re: Powered PCIE risers with capacitors Post by: tom_o on June 25, 2013, 07:59:36 AM Hello, I currently use powered risers with capacitors for my mining rigs, but now I heard that those risers are a fire hazard. Is this true? If yes - how can I remove them? I didn't care about capacitors, I just bought powered risers and recognized later, that they were a little different. I would be glad if someone can help me. You just need to desolder the capacitor and replace with wire. Title: Re: Powered PCIE risers with capacitors Post by: lbr on June 25, 2013, 03:58:50 PM If riser is done 'good' there is no reason it will cause fire.
And capacitor might be a good idea - it will smoothen voltage fluctuations, assuming it is on the 12v line. Title: Re: Powered PCIE risers with capacitors Post by: Felipeo on June 26, 2013, 09:59:54 PM Hello, I currently use powered risers with capacitors for my mining rigs, but now I heard that those risers are a fire hazard. Is this true? If yes - how can I remove them? I didn't care about capacitors, I just bought powered risers and recognized later, that they were a little different. I would be glad if someone can help me. You just need to desolder the capacitor and replace with wire. Or you can buy new one and be total secure: http://www.ebay.co.uk/itm/281125631820 ;D Title: Re: Powered PCIE risers with capacitors Post by: razorfishsl on June 27, 2013, 12:12:58 AM If riser is done 'good' there is no reason it will cause fire. And capacitor might be a good idea - it will smoothen voltage fluctuations, assuming it is on the 12v line. Fail.......... There is this myth that slapping loads of uf about has to be good, because its like magic and can store power......, In reality it is only 'good' if it is part of a deeper understanding of EXACTLY WHAT a capacitor does and WHY it is there. An example..... I had a 'friend' nosing at one of my rig power supplies, his analysis was I had useless capacitors, " no need to have .1uF capacitors across electrolytics, becasue 300uF is far bigger for storing power that it 'swamps' the .1uf (yep.. ok , if I need any finger painting done.. I know who to call) Considering a Video card can pull several tens of Amps during a peak, all a shitty little ill placed capacitor on the wires is going to do is become a potential source for power-supply ringing.....(amazing fact no 1..... a capacitor acts as SHORT until it is charged up..... the inrush is limited only by the resistance of the connections....) Title: Re: Powered PCIE risers with capacitors Post by: lbr on June 27, 2013, 01:36:40 AM If riser is done 'good' there is no reason it will cause fire. And capacitor might be a good idea - it will smoothen voltage fluctuations, assuming it is on the 12v line. Fail.......... There is this myth that slapping loads of uf about has to be good, because its like magic and can store power......, In reality it is only 'good' if it is part of a deeper understanding of EXACTLY WHAT a capacitor does and WHY it is there. An example..... I had a 'friend' nosing at one of my rig power supplies, his analysis was I had useless capacitors, " no need to have .1uF capacitors across electrolytics, becasue 300uF is far bigger for storing power that it 'swamps' the .1uf (yep.. ok , if I need any finger painting done.. I know who to call) Considering a Video card can pull several tens of Amps during a peak, all a shitty little ill placed capacitor on the wires is going to do is become a potential source for power-supply ringing.....(amazing fact no 1..... a capacitor acts as SHORT until it is charged up..... the inrush is limited only by the resistance of the connections....) Shunting 'big' capacitors with small 'fast' ones is a common practice usually they use However in terms of capacitance ur friend was right ; ) And video card does NOT pull "several tens of Amps during a peak" from the motherboard. Please read at least wiki ; ) Title: Re: Powered PCIE risers with capacitors Post by: lbr on June 27, 2013, 01:50:26 AM + I would not call Sanyo OS-CON "shitty little capacitor" )
Of course they are not suitable for power lines on tube amps, but nevertheless)) |