Question Trying to finish a high-end build (RTX 4090 and i9-13900k)


Nov 10, 2012
Hey y'all, I haven't build a computer since 2014. I am now in a place where budget isn't really an issue and am looking to go all out on a new build. I'm a little overwhelmed at how much has changed in the last 8 years.

I've already bought some parts (PCPartPicker), including a i9-13900k, MSI SUPRIM LIQUID X GeForce RTX 4090 (has an AIO cooler), and my disc storage (a SN850X 2TB NVME for the OS and programs, an 8TB sata drive for video and project files). Would it be possible to get help completing this build?

I'll use it for gaming, programming (including games), and content creation (I know that the 13900k is overkill, but figured I haven't build for so long, and would love to minimize render times).

I know both the CPU and GPU are going to pull mad power, so would love to get a good AIO cooler for the CPU and get a case that prioritizes airflow (also need to be big enough for both the CPU and GPU AIO coolers). (Does the mobo also have to support the two AIO coolers?) But the smaller the case the better (which I know isn't going to be small, with a 4090).

For ram (and I guess motherboard compatibility), I was thinking of going with 32GB of DDR5 (two 16BG sticks).

And for the PSU, I've heard that it's most efficient when you pull around half of the capacity? It is worth getting a 1500W PSU over say a 1200W? Also, I've read a little bit about cables melting with the 4090, do I need to pick a PSU with good connectors to avoid this?

Random notes, I don't care about RGB. Would prefer a case that's black if possible.

Do y'all have any ideas/suggestions for rounding out the build? Here is the requested info from the sticky:


Approximate Purchase Date: ASAP (not in a rush, but looking to buy now)

Budget Range: Not really an issue, but not looking to throw away money unnecessarily

System Usage from Most to Least Important: Gaming, Productivity (video rendering, blender rendering, etc.)

Are you buying a monitor: No

Parts to Upgrade: Fresh, new build, so everything. I've already bought

Do you need to buy OS: No (will be running Windows 11)

Preferred Website(s) for Parts: No preference

Location: United States

Parts Preferences: No preference (besides the Nvidia GPU and Intel CPU I already bought)

Overclocking: No

SLI or Crossfire: No

Your Monitor Resolution: I'll have one 4k monitor and two 1440p

Additional Comments: I don't care about RGB, would prefer a case that's black if possible

Why Are You Upgrading: Haven't build a computer since 2014


Thank you so so much for your help in advance! ♥
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LIAN LI Lancool III Mid Tower Computer Case $149.99
Corsair HX1200 80+ Platinum 1200W Modular Power Supply $256.10

or ...

Corsair HX1500i 80+ Platinum Modular Power Supply $399.99
Corsair 600W PCIe 5.0 12VHPWR Type-4 PSU Power Cable $19.99

or ...
Thermalright Intel LGA1700 Anti-Bending Bracket (Black) $12.90

ARCTIC Liquid Freezer II 420 CPU AIO $142.99
G.SKILL Ripjaws S5 Series DDR5 6000 32GB (2x16GB) CL30 $228.99

SAMSUNG 970 EVO Plus 500GB M.2 NVMe SSD $79.99

Storage SSD
SAMSUNG 970 EVO Plus 2TB M.2 NVMe SSD $199.99

A better look at those components.

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Figure that the cpu isn't 300w. Some bios have funky auto voltages, so the cpu can pull anything from @ 280w to almost 340w depending on the board. So figure 350w for a safe estimate for max. The 4090 liquid cooled can pull over 600w, so figure 650w as a safe estimate for max. OP doesn't have much else internally, so with fans, drives, mobo etc figure another 100w for the rest of the pc.

That's 1100w if everything inside the pc was pushed to its extreme max. That's basically impossible, but that's 100% full pc load.

A HXi1200 would cover that, no worries. Most heavy gaming loads don't use up more than @ 70% of the max load, so even pushed to gaming limits, you'd still be inside the 50-70% bracket, which is where psus like to be for efficiency, thermals, protections etc.

The HXi1500 would have more headroom, but it's wasted space, 400w that can't possibly be used as it's well beyond the ability of the pc, the only thing having it would do is lower the bracket from closer to 60% down to closer to 40% efficiency load. Basically nothing as the draw would be the same from the wall, at the same effective efficiency rating.

Both are good, neither will compromise the build or power requirements. Your choice if the extra $100 is of any personal value.

Now if you are crazy enough to think about overclocking either of those 2 monster components, the HXi1500 would be advised since there's no telling exactly what the power requirements will be, might add another 100w to the cpu just to get an extra 100MHz boost.

The biggest concern with that build isn't actually the pc, it's where it's used. We are getting into the realm of pulling 12-13A from the wall. On a standard bedroom circuit of 15A, that means with monitors plugged in, and the bedroom light on, you are getting perilously close to over-taxing the circuit rating, which is never a perfect even 15A, and it'd be far too easy to over heat and trip that breaker.
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