is 8gb of ddr4 ram enough to game

Solution
8GB is fine for most uses. Of course, more is better. However, given the make/model of the system in question, "more" may not even be an option. Don't sweat it. 8GB is fine.

Rumbletum

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If this question is about whether to buy a particular machine, then the answer is to get one with as much RAM as possible within your budget, other things like graphics being equal. Else if you already own the kit use it and see what happens.