Dear HS,
Is your RAM both sides have chipsets? If it is, you can use BP-RAMS44V2 series,
If not, we advise you to choose BP-RAMS44PS-CLBK. Maximus Xi Extreme's mono block (BP-MBASMXIE) will be in stock next week, but you can pre-order it now.https://shop.bitspower.com/index.php?route=product/product&path=67_97_354&product_id=7126