What are your current settings? Vray can use different methods for primary and secondary bounces. It looks like you currently use the bruteforce method for the secondary bounces. This creates noise if there are not enough samples.
up your gi samples, yes!
or:
render out as passes, comp your gi over your colors and blur it a little (or use the reduce noise filter). but thats not the way its supposed to be
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or:
render out as passes, comp your gi over your colors and blur it a little (or use the reduce noise filter). but thats not the way its supposed to be