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Welcome to our HP User Forum!
The answer would be: YES.
Your HP Z640 Workstation, according to: https://support.hp.com/us-en/product/hp-z640-workstation/6978835/document/c04496994#AbT2, has been fitted with a 925-watt power supply, which enabled real-life HP Z640 Workstation Users to install all kinds of high-end graphics cards: UserBenchmark: HP Z640 Workstation Compatible Components:
That includes an RTX 3060 Ti, but also the: RTX 3090, RTX 3080 Ti, RTX 3070, GTX 1080 Ti, RTX 2080 Ti, RTX 3070 Ti, etc.
The thing to check, of course, would be to make sure that your power supply has the sufficient number of PCIe (6+2) power cables, and that the dimensions of whatever card you choose will physically fit inside your desktop.
Hope this was helpful.
Kind Regards,
NonSequitur777
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