Yes, but the purpose of an mATX rig is for the small form factor. Yes, bigger cases also support mATX motherboards, but that would render the mATX board useless. An ATX board with the same features would cost less.

that build is a mATX build?

Yes. G Damn. This is becoming a train wreck. I assume since you had no idea that was an mATX rig, you don't care about form factor? What will the rig be used for? Do you need peripherals? Will you overclock? Max budget is £1200, correct?

Sanctyy wrote Yes. G Damn. This is becoming a train wreck. I assume since you had no idea that was an mATX rig, you don't care about form factor? What will the rig be used for? Do you need peripherals? Will you overclock? Max budget is £1200, correct?

yeah it is or can push to 1300, and its for gaming

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This will do you well. You might prefer this 970 over the EVGA one;
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If you can spend the extra, add a 2nd 970.