The MSI Pulse GL66 12UGK pairs a 12th-gen Intel CPU with an NVIDIA RTX 3070-class GPU, and under a full gaming load that combination is exactly what the 240W power budget exists to feed. If your GL66 is draining its battery while plugged in, dropping clock speeds, or warning about charger wattage, the adapter — not the laptop — is usually at fault. The Chicony A20-240P2A is the OEM brick this machine was specified around. This guide is written specifically for that laptop rather than as a generic charger pitch.

Three part numbers, one adapter

Listings for this brick often show several codes, which makes buyers second-guess whether they've found the right one. They identify the same physical adapter from different angles:

If your original GL66 adapter's label shows any of these three at 20V / 12A / 240W, you have the correct replacement.

Why 240W — and can a 200W stand in?

This is the most common GL66 question. The laptop ships with a 240W brick because peak CPU + RTX GPU draw approaches that figure. A 200W adapter will physically run the machine and charge it at idle or light use — and many sellers note the 240W unit can "replace 200W" for that reason. But the substitution only works one direction: a 240W brick safely covers a 200W requirement, not the reverse. Run heavy gaming on a 200W supply and the GL66 throttles the GPU to stay within budget, and the battery can discharge even while plugged in. For full, sustained performance, match the original 240W rating.

Why 20V is the non-negotiable number

Wattage affects how hard the laptop can run; voltage affects whether it's safe at all. The GL66 expects exactly 20V DC. A higher voltage risks the charging circuit; a lower one usually means no charge. This is also why you can't reuse an older 19.5V MSI brick here — check the decimal on the label, not just the wattage.

The spec at a glance

What the safety protections do

Genuine Chicony bricks include the protection circuits cheap clones often omit. Each guards one failure mode:

Beyond the GL66: other MSI models on the same 240W spec

While this adapter is built for the Pulse GL66 12UGK / 12UGKV-464, the same 20V/12A/240W standard appears on other MSI gaming lines — Pulse GL76, Katana GF66 and GF76, and Crosshair series among them. Series names are a starting point only: the same line ships in 180W, 200W, and 240W configurations depending on the GPU, so always confirm against your own adapter's label rather than the model family.

Before you order: a quick check

• Confirm your current adapter reads 20V and 12A (240W) — and 20V, not 19.5V.
• Match any one part number: A20-240P2A, A240A010P, or ADP-240EB D.
• Compare the plug shape and barrel size to your GL66's charging port.
• Check the input shows 100–240V for travel use.
• Note the included cord is a US plug — source a regional adapter if you're outside the US.