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240mm will be enough, especially if it involves a size reduction of 2L. It will also differentiate more from the SSUPD case.If we can believe OT's review, even the C4 doesn't get all that much cooler with the 280mm rad compared to the 240mm so it doesn't worth the size increase. Getting the same performance but while being smaller is also should be considered an advantage.
240mm will be enough, especially if it involves a size reduction of 2L. It will also differentiate more from the SSUPD case.
If we can believe OT's review, even the C4 doesn't get all that much cooler with the 280mm rad compared to the 240mm so it doesn't worth the size increase. Getting the same performance but while being smaller is also should be considered an advantage.