I'm planning a first build for 1440p gaming with a Ryzen 5 7600, RX 9070, 32GB DDR5-6000 RAM and a 1TB NVMe SSD. The rest is a B650 WiFi board, an 850W Gold PSU, a Phantom Spirit cooler and an Air 903 Max case. The monitor is 1440p 165Hz.
With about $100 left, would you upgrade something, put it toward peripherals, or save it?
I'd put it toward a 2TB SSD. Games can take up a lot of space, and having room to keep more of them installed is a pretty practical upgrade. You don't necessarily need to spend the whole $100 on the most expensive drive, either.
Check the exact PSU model before deciding. 850W and 80+ Gold tell you the capacity and efficiency rating, not whether the unit is well built. If it's the Corsair RM850e you have in mind, compare reviews of that specific model rather than paying more just to get a higher wattage or efficiency label.
The 32GB RAM and cooler already look sensible for this build. I wouldn't upgrade either just because there's money left.
What monitor and peripherals are you using exactly? A better mouse, audio setup or display might be more noticeable than another internal upgrade. If the monitor is already one you're happy with, you could save the money toward a future display upgrade instead.
Before buying a pricier motherboard, check what the B650 board actually has. An extra NVMe slot, faster Ethernet or easier drive installation could be useful, but only if those are things you need. Otherwise the money can stay in your pocket.
You could also check whether the extra cash gets you a worthwhile CPU or GPU upgrade. Compare the actual prices and performance of the parts available to you, though. If $100 doesn't make a useful jump, there's no need to force an upgrade.
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