ASUS ROG Strix RTX 3090 OC 24G

Specifications

Length

318.5mm

Thickness

Not published

Slots

2.9-slot

TDP

350W

Power connectors

3× 8-pin

VRAM

24GB

Vendor

NVIDIA

Architecture

AMPERE

What a buyer needs to know

318.5mm, 2.9-slot, and 🛑 3× 8-PIN. It fits an NR200P V2 on LENGTH and it is the card the PSU rule below exists for: three 8-pin sockets is more than a Corsair SF750 (or any 2-socket SFX unit) has, and a pigtail on a 350W card is not the answer. This is the 3090 that decides your power supply for you. ⚠ THE PSU RULE THAT WILL CATCH YOU — COUNT SOCKETS, NEVER CABLE ENDS. The Corsair SF750 ships EXACTLY 2× 8-PIN SOCKETS (Corsair's own page). The RTX 3090 ROG Strix, the MSI Gaming X Trio and the EVGA FTW3 are 3× 8-PIN CARDS: they CANNOT be safely powered by a 2-socket SFX unit like the SF750. The only way to make the connectors reach is a PIGTAIL (one cable, two heads) feeding a 350W card — an SFX PCIe cable is rated 150W, and SilverStone's own guidance is that a card above 225W wants two or three SEPARATE cables. Don't. ('4× 8-pin' on an SFX PSU usually means two cables with pigtails, not four sockets — which is why this catalog stores SOCKET counts.) AND ASUS THEMSELVES SPEC 850W for their own 3090s, above NVIDIA's 750W floor. A 350W GA102 with transient spikes on a 750W SFX unit is at the ragged edge. If you are building a 3090: a real 850W unit, with enough SOCKETS for the card you actually bought. THICKNESS: NOT PUBLISHED — and left NULL rather than guessed. CATALOG.md §3 gives a length, a slot count and a power requirement for every 3090 and a millimetre thickness for none of them. (The 39.8mm you will find quoted for the TURBO is a RETAILER listing — Gigabyte's own page is dead — and CATALOG.md marks it UNVERIFIED.) The engine will therefore TELL YOU it cannot check this card against a case's mm clearance, which is worth more than a soft number that reads like a pass. MEASURE THE CARD before you commit it to a tight case. THE VERDICT, AND ONE NUMBER SETTLES IT: RTX 3090 = 91.5fps @1440p Ultra. RTX 5070 = 96.4fps. THE 5070 IS FASTER — on 250W vs 350W, on 242mm/2-slot vs 313mm+/3-slot, brand new with a warranty, at ~$630 against $850–1,250 for a used 3090. For a box that sits under a TV, the 5070 wins on every axis a console cares about and ties on speed. The 3090's only remaining advantage is 24GB of VRAM — worth nothing for gaming and a great deal for local LLM work, which is an argument for keeping it in a DESKTOP, not for putting it under the TV. IF YOU BUILD IT ANYWAY (you own it; it is free): an NR200P-class ~18L case and a real 850W PSU. This is not a small box. SteamOS will not run it at all (no NVIDIA driver before 2027), and on Bazzite install `bazzite-nvidia-open` — the DESKTOP image — launching Steam Big Picture, NOT `bazzite-deck-nvidia`: Bazzite's own docs say the console session's GPU-accelerated web view 'must be enabled… for better performance in the UI' and that 'enabling this option will most likely cause game-breaking graphical artifacts'. NVIDIA + Bazzite desktop = fine. NVIDIA + the gamescope console session = officially beta. THE NVIDIA CEC TAX: +$48.56 and a USB port. HDMI-CEC is what makes the box feel like a console (TV turns on with it, one remote, correct input). On AMD it costs ~$18 — CEC tunnelling over DisplayPort AUX is implemented in `amdgpu`, so an active DP→HDMI adapter from the kernel's known-good list (CableCreation CD0712, Club3D CAC-1080, HP 2JA63AA) gets you there. NVIDIA's open kernel modules contain ZERO CEC symbols, so no adapter works and you must buy the Pulse-Eight USB-CEC adapter ($48.56). Budget it. WHERE NVIDIA GENUINELY WINS ON A TV: HDMI 2.1. AMD's HDMI 2.1 FRL only merged for kernel 7.2 and ships DISABLED by default; Bazzite is still on 7.1. NVIDIA's driver has driven HDMI 2.1 for years. For a device that plugs into a TV over HDMI, that is the opposite of the conventional wisdom and it is worth knowing.

Where to buy

No retailer link for this part yet.