Recommended power supply wattage for Ryzen 7 9850X3D and RTX 4090?

Quick question before I weigh in properly—what specific 4090 model are you looking at? Some of those factory overclocked ones can pull way more than the base spec, especially if you're gonna push the Ryzen too. In my experience, those transient spikes are no joke. I'd check out something like the be quiet! Dark Power 13 1200W 80 Plus Titanium for that extra buffer.

TL;DR: 1000W is usually fine, but 1200W gives you peace of mind for spikes and overclocking.

> Would a 1000W unit be enough, or should I play it safe with 1200W? What wattage are you guys running for this combo?

In my experience, you should definitely be fine with a high-quality 1000W unit, but I totally get the anxiety over those 4090 power spikes cuz they are *real*. Honestly, I just finished a similar build with a 7950X3D and the 4090, and I ended up going with the Corsair RM1000x 80 PLUS Gold Fully Modular ATX 1000 Watt Power Supply which cost me around $190. It's been working super well and I haven't had a single crash even when gaming and streaming at the same time!!

If you're planning on overclocking both the 9850X3D and that 4090 though, the 1200W might give you more peace of mind for the long term. I was looking at the EVGA SuperNOVA 1200 P2 80+ PLATINUM 1200W which is a bit more expensive, like $250-ish, but basically overkill for most people. I mean, even with all your RGB fans and SSDs, you're probably only hitting like 750-800W max under a heavy load, so 1000W gives you plenty of headroom. Plus, the newer ATX 3.0 units are designed to handle those transient spikes better anyway. Im super happy with my 1000W setup and it's quiet too... so yeah, unless you're doing crazy liquid nitrogen overclocking, save the cash and stick with a solid 1000W. gl with the build, it's gonna be a beast!

Just sharing my experience: I went through this exact dilemma last year when I was piecing together my 4090 rig. Honestly, I was staring at the price difference between a 1000W and a 1200W unit for like three days straight lol. In my experience, while 1000W is technically enough for most scenarios, the *value* play is actually more nuanced than just the sticker price.

I ended up grabbing the MSI MPG A1000G PCIE5 1000W 80 Plus Gold Fully Modular because it was on sale, and it's been solid, but I lowkey regret not jumping to 1200W for the efficiency curve. See, when your system is pulling 600-700W during a heavy gaming session, a 1000W unit is working harder and the fan noise reflects that. If you go with something like the Thermaltake Toughpower GF3 1200W 80+ Gold PCIe 5.0 or even the Corsair RM1200x Shift 80 PLUS Gold Fully Modular, the PSU stays in that "sweet spot" of efficiency (usually around 50% load) where it runs cooler and quieter.

Plus, the 9850X3D and 4090 are basically the peak of power draw right now. Over the years, I've learned that saving $40 today on a PSU feels bad when you have to swap the whole thing out in two years because GPUs keep getting hungrier. Basically, 1000W is the "practical" limit, but 1200W is the "I don't want to think about this again until 2030" choice. Since you're already dropping serious cash on those high-end parts, the extra overhead for transient spikes is worth the peace of mind imo. What's your total budget looking like for the rest of the cooling??

Yep, this is the way