Nope, I used my old 15 watt on my fender 65 watt and it worked fantastic.

Martin DSR
Taylor 214e
Fender Strat
Epiphone 335 Dot
Carlo Robelli Acoustic

1978 Fender Pro Reverb
Boss Blues Driver
Boss Super Overdrive
EHX Holy Grail
Boss DD-20 Giga Delay
There really are no cables for specific watts of amps. However if you get into the higher watts, like 100W, you may want to consider a cable of better quality if you lost yours.
Quote by Gunpowder
C'mon, man. We're just kidding. We all know that drummers are important.

After all, without drummers, who would bag my groceries?

(='.'=) This is Bunny. Put him in your signature and help
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No they're the same. You'll be fine.
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and my mom then told me to masturbate more.

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Big burly men grunting without shirts on pretty much summed up my childhood.

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Has anyone really been far even as decided to use even go want to do more look like?
as long as it has the same specs your amp requieres. like if your amp requires 15v dc, at 300 micro amps(for example) and you use a cable with a significantly less or more then it would be bad. if the cable itslef is just a cable and doesnt alter the electric flow then it should be fine. trust me on this one i am studying to be an electrical engineer.

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Better yet. "My arm is tired, could I put it in between your legs so I can sexually violate you during the movie?"
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lets watch this thread die like i should have on page 1