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Have you noticed you are grouping in the first query? you certainly can expect this query to be slower than the second one.
By the way...
What's the cardinality of "x" on col2?
Do you have up-to-date stats?
Please post Explain Plan for your two queries.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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