Can an Xbox Live prepaid card be used to extend an existing Xbox Live Gold account that has...

Also for a little more info on the prize. Nowhere does it stipulate that you cannot use the One Month Code with an existing Microsoft Account Which already has Gold. When looking at the xbox.com/usagerules , No where does it state that a "Xbox LIVE Prepaid
1 month Gold Membership Card." cannot be added to an existing gold account.

But... using a prepaid card to add money to the microsoft account and then pay with that? Not the prepaid cards of "12 Month Xbox Live Gold Membership", I want to use the ones that add money like "Xbox Live $50 Card"

Sign in to Xbox LIVE with the account for which you want to use the prepaid code.

Press the Guide button on the controller.

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Go to Games & Apps and select Redeem Code.

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Enter the 25-character prepaid code and select Done.

When prompted, click Yes to confirm the redemption.

Here is what happens to your account when you redeem different types of prepaid codes:

Xbox 360 Entertainment For All Plan: You cannot “stack” or combine prepaid subscriptions during the life of the contract.

Xbox LIVE Gold Membership: An Xbox LIVE Gold Membership is added to your account, or an existing membership is extended.

Microsoft Points: Microsoft Points are added to your account.

Xbox LIVE Marketplace content: The content is added to your account and begins downloading.

Thank you so much another question, if i want to buy a prepaid xbox live gold card, can i use the ASIA prepaid card, or i should buy the US xbox gold prepaid card..

Yes. As long as you put in the prepaid card info before it charges your credit card.