I'm afraid it will not work since both the GTX 1070 and RTX 2060 requires 500w PSU, while the one installed on your desktop is only 450w.
Did someone help you today? Press the star on the left to thank them with a Kudo! If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.