Viper Lair has posted a review on the Ultra Dual Channel PC4000 Premium memory

Looks are of course secondary to performance but here the Ultra doesn't fail you. The Ultra PC4000 is quite capable of delivering in the area's it is needed, be it raw numbers or overclocking potential. Like most PC4000, to get the really high clocks from it, you will need to up the voltage to 2.9v but the ram hasn't flinched running at this (default is 2.7v) voltage once in the week or so I've been using it.

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