Hello Don,
After comparing the PCB photo of the card - ROG-STRIX-RTX3080-O10G-WHITE, it looks like the 3090 Strix card. BP-VG3080AST seems compatible, you can have a try, and please notice the height of the chipsets and choose the correct thickness thermal pads. "designed for the ROG Strix GeForce RTX 30 series graphic cards", sorry that we should make it more clear. This block fits for ASUS 3080 Strix card.
Any question, feel freet to contact us.