Hello Innocent,
Sorry that we do not have the plan to make an active backplate for the 3090 HOF(like the one for Strix). But we have the water block BP-EVB3090 which is compatible with 3090 HOF too. If you want to know how to connect the BP-EVB3090 to BP-VG3090GXH, please send an email to follows address, we will send the pictures to you.
shopservice@bitspower.com.tw
https://shop.bitspower.com/index.php?route=product/product&product_id=8034&search=EVB3090
