I believe a PCIe2.0 card is backward compatible with PCIe1.0 bus slot, The card will just run at lower speed. I have used PCIe3.0 card in older Dell that has only PCIe2.0 slots. 530 has PCIe1.0 bus. p.180/226 https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_inspiron_desktop/inspiron-530_owner%27s%20manual_en-us.pdf Your video card is low profile so it only works with slim 530. For mini tower 530 you need full height card. PSU needs to be about 300W.