Question I can't find a compatible air-cooling with my motherboard (P8B75-M LX)

[Dewei]

I tried to install two ventirad (Shadow Rock 2 and NHD15), but each time the holes in the back of the motherboard are too small. How to find a compatible cooler?

 

[13thmonkey]

There's no reason that they should not fit. It's just a socket 1155 mobo.

 

[Dewei]

Not really, it's a socket LGA1155 (LM), maybe the problem is here ?

 

[13thmonkey]

1155 is 1155. All of the holes should be the same size.

 

[Dewei]

Here screws don't fit ( sorry for my bad english, not my native language)

 

[Karadjgne]

Those are nuts on the backplate. Whichever cooler you decide to use, you need to use the backplate that comes with that cooler

You'd use that backplate, put the included standoff washers, put the brackets on top then screw the cooler down. You'll find all the directions in the cooler box. The other double screws you do not use, they are for lga2011 not lga1155

 

[13thmonkey]

That should fit then, both of those cooler will suit several different (but closely related) sockets that might have slightly different spacings, so there will be options in the brackets, it may be that they are overlapping holes, and if you pick the wrong ones on one side of the cooler the other will not fit.

https://cdn2.bigcommerce.com/server...4/backplate__87290.1441200589.356.300.png?c=2
Notice the scalloping on the slots

 

[Dewei]

Thanks you for your awsers ! if I understand well I need to remove the "bad" backplate of my motherboard to replace by the one in the box ? I'm not really sure how to do that, just removing my old ventirad and pull the backplate ?

 

[Dewei]

The back of my motherboard.

 

[13thmonkey]

That backplate should be fine, but to be safe use the one that came with your cooler. The just a matter of the very precise position of the screws.

 

[Dewei]

Thank you again, I will try to remove this now.

 

[13thmonkey]

Look closely here: And you'll see grooves in the bracket, these are crucial that they are placed correctly, else the other size will not fit.

 

[Dewei]

I replace backplate and ALL WORK FINE ! thank you very much everyone !

 

[Karadjgne]

Nice.