• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

Extension cables

C

CoW]8(0)

[H]ard|Gawd
Joined
Jul 25, 2005
Messages
1,427
Are there any noticeable issues for people using PSUs with extenders for big cases?

Are there specific cables I should try to avoid extending. For example, the 24 pin motherboard cable to power the CPU?
 
I use extenders on my PCI-e cables and the 4 pin molex to the mainboard that you see in some mainboards for extra wattage to the PCI-e lanes.

The extenders range from 10 to 40 inches and I have seen no problems.

I do recall that the rsistance to flow increases a bit with cable length, if I recall? But I don't know the exact formula......there has to be an engineer on here somewhere who could answer that.:D
 
It does increase the resistance. However, the resistance is negligible, unless you're trying to extend like 10 feet.
 
magoo said:
I do recall that the rsistance to flow increases a bit with cable length, if I recall? But I don't know the exact formula......there has to be an engineer on here somewhere who could answer that.:D
Click to expand...
Yeah, it's pretty complicated. The formula is:

(total resistance) = (resistance per unit length) * (total length)

Also, you have to add in the resistance of each connector junction, which is different from the resistance of the wire itself. And if the wires in the extension are a different gauge than the PSU wires, you have to figure out the resistance of each segment separately and add them together. See? Pretty complicated ;).

(There is a more complicated version that takes into account the resistivity of the material the wire is made of along with its cross-sectional area, but since all these wires use standard AWG sizes, you can easily look up the resistance per length values on an AWG table)
 
I've used extension cables on 4-pin molex connectors in a lot of my computers, but never more than 6 inches, and it never caused any noticeable problems.

On a related subject, would there be any problem in using a longer cable going from the back of the PSU to the wall? Like if I were to use a 30' or 50' cable?
 
Zero82z said:
Yeah, it's pretty complicated. The formula is:

(total resistance) = (resistance per unit length) * (total length)

Also, you have to add in the resistance of each connector junction, which is different from the resistance of the wire itself. And if the wires in the extension are a different gauge than the PSU wires, you have to figure out the resistance of each segment separately and add them together. See? Pretty complicated ;).

(There is a more complicated version that takes into account the resistivity of the material the wire is made of along with its cross-sectional area, but since all these wires use standard AWG sizes, you can easily look up the resistance per length values on an AWG table)
Click to expand...

Yeah. Anything involving more than simple math, Im out.
 
You must log in or register to reply here.
Back
Top