Quick Answer
Wattage is worth paying for as GPU headroom, not bragging rights. A teen's RTX 4060 build is happy on 650W (~R1,400); an RTX 4070 Ti or 4080 wants 750-850W. Buy one tier above your current GPU so the next upgrade does not force a new PSU.
Wattage by GPU tier for Python data analysis
Pandas, NumPy and model training peg all cores during long runs, so steady airflow under sustained load is what counts. Match the rail to the card: an RTX 4060 or RX 7600 build runs comfortably on 550-650W; an RTX 4070/4070 Super wants 650-750W; an RTX 4080 needs 850W; an RTX 4090 wants 1000W. A quality 650W Gold unit (~R1,400-R1,700) covers the majority of SA gaming builds with room to grow.
PSUs worth buying in SA
Dependable picks at Evetech span the Corsair RM650/RM750x (R1,800-R2,600), Seasonic Focus GX-650/750 (R1,800-R2,200) and MSI MAG A650/A850GL (~R1,300-R2,200). Aim for 80+ Gold and a long warranty (Seasonic and Corsair carry 7-10 years). Avoid no-name 'gaming' PSUs under R700; a failing PSU can take other parts with it.
Modular, ratings and headroom
80+ ratings go Bronze, Silver, Gold, Platinum, Gold is the value pick for SA buyers. Fully-modular cabling keeps a compact case tidy and improves airflow; semi-modular saves a little if you have space. Buy one wattage tier above your current GPU so a future card swap does not also mean a new PSU.
FAQ
What wattage PSU do I need for an RTX 4060 build?
A quality 550-650W 80+ Gold unit is plenty for an RTX 4060 or RX 7600 system. A 650W unit (~R1,400) leaves headroom for a later step up to an RTX 4070-class card.
Is 80+ Gold worth it over Bronze?
Yes for most buyers. Gold wastes about 10 percent less energy, runs cooler and quieter, and typically ships with a longer warranty, well worth the ~R400-R500 premium.
Do I need a native 12VHPWR cable?
Only for newer high-end cards (RTX 4080/4090 and successors). A PSU with a native 12V-2x6 cable, like the Corsair RM850x, is safer than an adapter for those GPUs.
Pick an 80+ Gold unit one tier above your GPU's needs (650W for mid-range, 850W for high-end) and check it has the native cables your card requires.