I wouldn't be concerned about water temps, but it's a good question.
Without a Pelt, people have reported water temps at 30 deg C or less. I think that even with a Pelt, you should expect pretty much the same. Since your vid card will run much hotter, there's still a benefit in using the same water to cool it.
Alternatively, if you're crazy enough, you could pelt the VC too. It would be a custom made solution though, because I don't believe that there's such a block out on the market.
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