We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Black 3U rackmount server chassis with brushed aluminium front bezel, three 5.25-inch drive bays, two front USB 2.0 ports

Athena Power

Athena Power RM-3U300PRR55U2 3U rackmount server chassis 550W redundant PSU

SKU CH-KRCA-8NTRP MPN RM-3U300PRR55U2

3U rackmount server chassis with 550W redundant power supply, three 5.25" bays, two 3.5" bays, seven expansion slots and front USB 2.0 ports

  • Form factor3U
  • Chassis styleRackmount
  • Housing materialBrushed Aluminum Front Bezel / 1.2 mm SECC
  • Supported motherboard sizesMicroATX (9.6 in x 9.6 in) ATX (12 in x 9.6 in) Mini-ITX (6.
  • Power supply2U 550 W Micro Redundant power supply
  • 5.25-inch external bays3
  • Redundant 550W supply keeps systems running if one module fails
  • 3U height fits standard racks while holding full-size ATX boards
  • Three 5.25" bays provide room for optical drives or hot-swap cages
  • Two front 80mm fans plus optional 60mm pair move air through the chassis
  • Removable washable filter protects internals from dust without tools

Chassis and Power Configuration

The Athena Power RM-3U300PRR55U2 is a 3U rackmount server chassis with a 550W redundant power supply. It supports ATX, MicroATX and Mini-ITX motherboards. The unit includes a brushed aluminium front bezel and 1.2mm SECC body.

Ideal Users and Limitations

This chassis suits builders who need hot-swap power redundancy in a 3U form factor. It also works for installations that require three 5.25in external bays. Buyers who need more than two internal 3.5in bays should look at larger enclosures. Systems requiring horizontal expansion slots cannot use the vertical-only layout.

Deciding Specification

The 550W redundant power supply is the single specification that determines suitability. It delivers fail-over protection for critical workloads while fitting the 2U power supply cavity. Verify that your total system draw stays within this limit before purchasing.

How it compares

Measured against everything we stock in Rackmount Server Cases, at today’s prices. Recalculated every night.

Price $392.99
Pricier than about 76% of the 1,006 comparable items (median $222.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameAthena Power
Model nameRM-3U300PRR55U2
Product colorBlack
Storage
5.25-inch external bays3
3.5-inch internal bays2
Ports & slots
Expansion card slotsVertical Full Height x 7
Front panel portsUSB 2.0 × 2 (Front)
Power
Power supply2U 550 W Micro Redundant power supply
Size & build
Form factor3U
Chassis styleRackmount
Housing materialBrushed Aluminum Front Bezel / 1.2 mm SECC
80mm fan count(Front) 80 mm x 2
Product dimensions5.2 in × 17.13 in × 15 in
Shipping weight13.74 kg
Package size572 × 516 × 284 mm
Compatibility
Supported motherboard sizesMicroATX (9.6 in x 9.6 in)
ATX (12 in x 9.6 in)
Mini-ITX (6.7 in x 6.7 in)
More details
60mm fans(Oprtional) 60 mm x 2

Questions about this item

Will a standard ATX board measuring 12 inches by 9.6 inches fit in the 3U chassis?

Yes, the chassis supports ATX (12 in. x 9.6 in.), MicroATX (9.6 in. x 9.6 in.) and Mini-ITX (6.7 in. x 6.7 in.) motherboards.

How do I install the 2U 550W redundant power supply and what step is often missed?

Slide the PSU module in from the rear until it locks, then seat each power module firmly; the common mistake is leaving a module partially inserted so redundancy is not active.

When should I clean or replace the removable air filter on the front bezel?

Inspect the washable filter monthly in dusty environments; rinse and dry it before refitting, and replace it if the mesh is torn or no longer seals against the bezel.

More in Rackmount Server Cases

Similar items