How are mixed-card CF + CF-X scores classed?

[K404]

Err.... as title really. If two different cards are used together, how should the result be submitted to HWB?

 

Im guessing that it should be entered as a multi-GPU score in the category of the more powerful card?

 

What if the cards are a CF/ CF-X of low-end current gen and high-end of last-gen,

 

Or... if the cards performance is fairly similar?

 

 

K