Akasa 140mm fans - Apache vs Viper

[nails666]

Hi, I'm planning to swap out my current intake fans on my Enthoo Pro (the stock 200mm front and a Bitfenix Spectre Pro 140mm on the floor) as they are too loud and don't seem to be pushing enough air through.
I've already got a couple of Apache Black 120mm fans on the rad of my 295x2 and I've been very impressed with them so I'm tempted to go for them again. Looking at the Vipers as well though they seem to be very similar but with a slightly higher max RPM. Are they basically the same fans, i.e. I'll be running them off a fan controller so if I run them both at 1000rpm they would be the same noise and performance it's just that the Vipers can go to higher limit?
Obviously the colour of the Vipers isn't quite so easy on the eye but the front intakes at least will be hidden from view so I could live with them

Thanks,

Ross

 

[canuseemygrapes]

I like vipers, quality fan, good airflow and static pressure. All good really apart from the yellow.
I popped the blades off, covered the bearing assembly in masking tape and used plasti-kote white to make it normal.

 

[hyperseven]

I like vipers, quality fan, good airflow and static pressure. All good really apart from the yellow.
I popped the blades off, covered the bearing assembly in masking tape and used plasti-kote white to make it normal.

will that not alter the balance of the blades?