If Kaioken double your power...

[Let's Go Fearless!]

Then what would Kaioken 2x do to your body other than strain?

 

[SSJ2]

Huh? Kaioken is Kaioken x2.

 

[Let's Go Fearless!]

This

Spoiler

And he even stated that Kaioken 2x wasn't enough against Vegeta.

Spoiler

 

[SSJ2]

I can't see the images. Kaioken and Kaioken x2 are the same thing.

Chapter: 229 (DBZ 35), P1.1
Narrator: “Vegeta's strength has greatly surpassed what Goku had figured on...! That power was such that not even the Kaio-Ken, which doubled Goku's battle power, could give Goku the upper hand... What will you do?! Goku!!"

 

[Let's Go Fearless!]

Can you see it on mangafox? http://mangafox.me/manga/dragon_ball/v20/c035/18.html

 

[SSJ2]

I know what you're referring to. Kaioken and x2 are the same thing. The narrator states it in the quote I just posted. As for why Goku dubs it x2 the second time he uses it, I don't know, but they are one in the same.

 

[Let's Go Fearless!]

But after Goku knew that Vegeta was stronger than his Kaioken, below the image it says ''Next: Kaio-ken x 2...!'' which could imply that the Kaioken and Kaioken 2x are different from each other. http://mangafox.me/manga/dragon_ball/v19/c034/14.html

 

[SSJ2]

I disagree. The narrator already confirms that regular Kaioken doubles your power, so what would you suggest Kaioken x2 does?

 

[Let's Go Fearless!]

?

Also after the narrator stated that, Goki used Kaioken 2x and stated that still wasn't enough which could implies that Vegeta > Goku Kaioken 2x > Goku Kaioken.

 

[SSJ2]

Because Goku never said it himself yet, only the narrator did. Goku is just confirming the narrator's words by saying that Kaioken is useless.

 

[Let's Go Fearless!]

Yeah, probably Goku used Kaioken again and confirmed it later.

 

[Jerk Store]

Kaioken x2 is x2.00000000001, they just didn't feel like adding all those zeros and a one when Goku yelled it out cause of coolness factors and shit.

TRUE STORY!

 

[sei'taer]

From what I had explained to me once, the only real difference is the way it's phrased in Japanese. Kaio-ken doubles your power. This is shown when goku (pegged by ginyu at about 85k) reaches 180k with a regular kaio-ken. With kaio-ken x 2, goku at 8,000+ was still weaker than vegeta at 18,000.

So kaio-ken and kaio-ken x 2 are the same. Both double your power.