The Steam Deck OLED and ASUS ROG Ally X both charge and expand over USB-C, and both take a microSD card, but they are not the same accessory ecosystem. Deck docks with a molded cradle are Deck-shaped. Ally X brings an ~80Wh battery and USB4-class host behavior that likes stronger PD bricks for 30W Turbo. XG Mobile is Ally-only. This guide only lists accessories with confirmed Deck OLED and/or Ally X fit from listings or credible docs, and it calls out what does not cross over.

Charging

Match the brick to the hungrier device, then add ports. Deck is fine on ~45W. Ally X wants more headroom, especially through a dock. Travel GaN kits are covered in depth at /gan-travel-charging-kit-everything-you-need.

Best everyday GaN for both

The Anker 735 Charger (Nano II 65W) is the daily cube that clears Deck's ~45W class and still feeds Ally X without hunting for the stock brick. One USB-C port can deliver the full 65W; the second USB-C and USB-A share the pool when a phone joins.

✓ Pros

  • ✓ Full 65W on a single USB-C port for Deck and Ally X class loads
  • ✓ Tiny GaN body with foldable prongs for bags
  • ✓ Street price near $25 with a huge review volume

✕ Cons

  • ✕ Shared 65W pool throttles when three devices charge at once
  • ✕ No cable in the box (pair with a rated USB-C PD cable)
  • ✕ Not enough headroom for two handhelds at full rate on one brick

Compatibility note: Confirmed USB-C PD charger for both Steam Deck OLED (~45W class) and ROG Ally X (65W-class daily use). Prefer a USB-IF / e-marker cable when charging through a dock.

Best multi-device / travel brick

When the bag also needs a phone and earbuds, or when a dock's PD passthrough wants a strong upstream supply, the Anker 737 Charger (GaNPrime 120W) gives a 120W shared pool with roughly 100W available on one USB-C port.

✓ Pros

  • ✓ ~100W single-port ceiling for Ally X Turbo-through-dock and multi-device kits
  • ✓ Two USB-C plus USB-A with dynamic PowerIQ allocation
  • ✓ Foldable plug and ActiveShield monitoring for travel

✕ Cons

  • ✕ Street price often near $65 to $76
  • ✕ Shared wattage drops when two high-draw devices plug in together
  • ✕ Larger than a single-port 65W cube

Compatibility note: USB-C PD up to ~100W on one port works for Deck (overkill on wattage, fine electrically) and Ally X, including dock upstream power for higher TDP modes. Head-to-head with another 100W-class brick: /anker-737-vs-ugreen-nexode-100w.

Spare PD cable both hosts use

Both handhelds charge over USB-C. The JSAUX 100W USB-C to USB-C cable (2-pack, 6.6 ft) is the cheap spare pair for brick-to-handheld or brick-to-dock runs.

✓ Pros

  • ✓ 100W-rated USB-C PD for Deck and Ally X charge paths
  • ✓ Two 6.6 ft cables in one pack for dock and bag
  • ✓ Inexpensive spare that dies before the handheld does

✕ Cons

  • ✕ Cable-only; still need a GaN brick or dock PD input
  • ✕ Not a display / dock substitute
  • ✕ Avoid mystery no-name cables for high-watt Ally Turbo setups

Compatibility note: Confirmed USB-C PD cable class for both Steam Deck OLED and ROG Ally X charging. Use e-marker rated cables when pushing higher wattage through a dock.

Dock and portable hub

Living-room dock vs bag hub. Prefer a listing that names Steam Deck OLED and/or ROG Ally X. Molded Deck cradles will not hold Ally X. Portable hub shortlist context: /best-usb-c-hubs-2026. Laptop-style accessory thinking for USB-C hosts also appears in /framework-laptop-accessories.

Best shared dock for Deck OLED and Ally X

The JSAUX HB0603 6-in-1 docking station is the shared TV/desk pick: HDMI up to 4K@120Hz class, Gigabit Ethernet, three USB-A 3.0 ports, and 100W PD passthrough. The listing explicitly includes Steam Deck OLED and ROG Ally X (and notes Ally X should be used without a thick case).

✓ Pros

  • ✓ Listing confirms Steam Deck OLED and ROG Ally X
  • ✓ 4K@120Hz HDMI class plus Gigabit Ethernet and 100W PD in
  • ✓ Three USB-A 3.0 ports for keyboard, mouse, or drive

✕ Cons

  • ✕ Not a molded Deck-only cradle; stand/fit depends on case thickness
  • ✕ Ally X often needs the case removed for a secure seat
  • ✕ Still needs a strong upstream charger for Ally 30W Turbo claims

Compatibility note: Confirmed for Steam Deck OLED and ROG Ally X per Amazon listing. This is a USB-C dock, not an XG Mobile enclosure, and not a Deck-shaped cradle that would refuse Ally X.

Best portable hub for Ally X desk / travel

When you want HDMI, Ethernet, SD/microSD, and PD passthrough on a stick (especially on Ally X USB-C / DP Alt Mode desk use), the Anker 555 USB-C Hub (8-in-1) is the bag pick. Deck can use the same stick as a generic USB-C hub, but the JSAUX dock above is the better living-room station.

✓ Pros

  • ✓ 4K60 HDMI plus Gigabit Ethernet in one travel stick
  • ✓ 10 Gbps data ports plus SD and microSD
  • ✓ Useful on Ally X USB-C / DP Alt Mode desks without a full dock stand

✕ Cons

  • ✕ Generic USB-C hub, not a molded handheld cradle
  • ✕ Needs a strong 100W-class charger for meaningful PD passthrough
  • ✕ Deck living-room setups usually prefer a dedicated handheld dock

Compatibility note: USB-C hub with DisplayPort Alt Mode HDMI for hosts like ROG Ally X. Works as a generic USB-C hub on Steam Deck OLED too; it is not a Deck-shaped dock and does not replace XG Mobile.

Storage

Best microSD for both handhelds

Both Deck OLED and Ally X take microSDXC. The SanDisk Extreme 512GB microSDXC (A2 / V30) is the capacity upgrade that still carries A2 app-class and V30 video-class ratings for game installs and media.

✓ Pros

  • ✓ 512GB A2 / V30 UHS-I card both handhelds can read
  • ✓ Strong sequential ratings for installs and updates
  • ✓ Includes SD adapter for desktop offloads

✕ Cons

  • ✕ Street price near $120 depending on sales
  • ✕ UHS-I bus, not an internal NVMe replacement
  • ✕ Always buy from a reputable seller to avoid counterfeit cards

Compatibility note: Confirmed microSDXC for Steam Deck OLED and ROG Ally X microSD slots. Format in the handheld or as the OS docs recommend before large game installs.

Case and travel

Best protective case for Steam Deck OLED

The JSAUX PC0104 ModCase is a Deck OLED / LCD modular shell with a detachable front cover, metal kickstand, and strap. Ally X needs its own case; this shell will not fit.

✓ Pros

  • ✓ Listing confirms Steam Deck OLED and LCD fit
  • ✓ Detachable front cover for bag tosses without a bulky carry case
  • ✓ Modular kickstand and strap for tabletop and accessory mounts

✕ Cons

  • ✕ Steam Deck only; will not fit ROG Ally X
  • ✕ Some docks need the case removed or a thinner shell
  • ✕ Kickstand and strap bits can loosen with heavy travel abuse

Compatibility note: Confirmed for Steam Deck OLED (and LCD). Not compatible with ROG Ally X. If you dock often, confirm clearance with your chosen dock before leaving the shell on.

Comparison

Accessory Host fit Role Street price (approx.)
Anker 735 65W Both Everyday GaN brick ~$25
Anker 737 120W Both Travel / dock upstream brick ~$65
JSAUX 100W cable 2-pack Both Spare PD cable ~$7
JSAUX HB0603 dock Both (listing) HDMI + Ethernet + PD dock ~$36
Anker 555 8-in-1 Ally X desk / both as USB-C hub Portable hub ~$36 to $50
SanDisk Extreme 512GB Both microSD storage ~$120
JSAUX ModCase PC0104 Deck OLED only Protective shell + cover ~$27

The Bottom Line

Charge both handhelds with the Anker 735 65W, pack the Anker 737 120W when a dock or second device shares the outlet, and keep a JSAUX 100W USB-C cable in the bag. For TV or desk play, use the JSAUX HB0603 when you want one dock that lists Deck OLED and Ally X, or the Anker 555 as a portable Ally X USB-C hub. Expand storage on either handheld with the SanDisk Extreme 512GB, and protect a Deck OLED with the JSAUX ModCase (Ally X still needs its own shell). Skip Deck-shaped cradles for Ally X, skip XG Mobile expectations on Deck, and size PD bricks for the hungrier host.