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Midnight Black 18 inch gaming laptop with thin profile

MSI

MSI Stealth A18 AI+ A3XWJG 18" UHD+ 120Hz Mini LED RTX 5090 64GB 4TB gaming laptop

SKU CH-9NJ4-AS4XJ

18-inch UHD+ 120Hz Mini LED display driven by a 12-core Ryzen AI 9 HX 370 and RTX 5090 with 24GB GDDR7, 64GB DDR5 and 4TB NVMe SSD

  • ColorMidnight Black
  • Operating SystemWindows 11 Pro
  • CPUAMD Ryzen AI 9 HX 370
  • Screen18" UHD+ 120Hz
  • Memory64GB
  • Storage4 TB M.2 PCIe 4.0 x4 NVMe SSD

CPU Name AMD Ryzen AI 9 HX 370

Size|OS|GPU|Memory|SSD|Option

  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|32GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|32GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|32GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|32GB|8 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|64GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|64GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|64GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|64GB|8 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|96GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|96GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|96GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 4070TI Laptop GPU|96GB|8 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|32GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|32GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|32GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|32GB|8 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|8 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|16 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|2 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|4 TB|QHD+
  • 16.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|8 TB|QHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|2 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|4 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|8 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|2 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|4 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|8 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|2 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|4 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|8 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|2 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|4 TB|UHD+
  • 18.0"|Windows 11 Home|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|8 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|2 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|4 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|64GB|8 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|2 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|4 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5080 Laptop GPU|96GB|8 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|2 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|4 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|64GB|8 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|2 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|4 TB|UHD+
  • 18.0"|Windows 11 Pro|NVIDIA GeForce RTX 5090 Laptop GPU|96GB|8 TB|UHD+

Struck-through versions exist but are not stocked here.

  • 12-core Ryzen AI 9 HX 370 hits 5.1 GHz turbo for heavy multitasking
  • RTX 5090 with 24 GB GDDR7 drives 4K gaming and AI workloads
  • 18-inch UHD+ Mini LED at 120 Hz delivers sharp HDR visuals
  • 64 GB DDR5 5600 dual-channel memory handles large datasets smoothly
  • 4 TB PCIe 4.0 NVMe SSD loads games and apps in seconds

18-inch UHD+ Mini LED for creators and gamers

The MSI Stealth A18 AI+ A3XWJG pairs an 18-inch UHD+ Mini LED panel at 120 Hz with an AMD Ryzen AI 9 HX 370 12-core processor and an NVIDIA RTX 5090 laptop GPU carrying 24 GB of GDDR7. The system ships with 64 GB of DDR5 memory in dual-channel configuration and a 4 TB PCIe 4.0 x4 NVMe SSD. Windows 11 Pro is pre-installed on the Midnight Black chassis.

Before ordering verify power and peripheral needs

The unit draws power through a proprietary adapter rated for the combined CPU and GPU load, so confirm your travel kit includes the supplied brick and cable. The 15.74 by 11.41 by 0.94 inch footprint and 6.39 lb weight require a backpack or sleeve sized for 18-inch mobile workstations. Check that external displays you plan to use accept the available video outputs and that any docks provide sufficient downstream bandwidth for the 3840 by 2400 internal resolution.

Sustained load behaviour

HIDevolution applies Gelid GC Extreme thermal interface material to both the CPU and GPU during its build-to-order process. This treatment lowers peak temperatures under prolonged compute or render workloads, reducing the likelihood of frequency throttling during extended sessions. The 12-core processor maintains its 5.1 GHz max turbo frequency more consistently when the cooling subsystem can reject heat efficiently across the vapour chamber. The 5600 MHz DDR5 memory and PCIe 4.0 storage sustain throughput without thermal-induced latency spikes.

Highlights

  • 12-core Ryzen AI 9 HX 370 hits 5.1 GHz turbo for heavy multitasking
  • RTX 5090 with 24 GB GDDR7 drives 4K gaming and AI workloads
  • 18-inch UHD+ Mini LED at 120 Hz delivers sharp HDR visuals
  • 64 GB DDR5 5600 dual-channel memory handles large datasets smoothly
  • 4 TB PCIe 4.0 NVMe SSD loads games and apps in seconds

Specifications

BrandMSI
SeriesMSI Stealth A18 AI+
ModelStealth A18 AI+ A3XWJG-006US
Part NumberMS-STEALTHA18AI3006-HID2P
ColorMidnight Black
Operating SystemWindows 11 Pro
CPUAMD Ryzen AI 9 HX 370
Screen18" UHD+ 120Hz
Memory64GB
Storage4 TB M.2 PCIe 4.0 x4 NVMe SSD
Graphics CardNVIDIA® GeForce RTX™ 5090 Laptop GPU
Video Memory24GB
CommunicationLAN and WLAN
Dimensions (W x D x H)15.74" x 11.41" x 0.94"
Weight6.39 lbs
CPU TypeAMD Ryzen AI 300 Series
Processor NameAMD Ryzen AI 9 HX 370
Number of Cores12-core Processor
Turbo FrequencyMax Turbo Frequency 5.1 GHz
CPU L3 Cache36 MB
Screen Size18.0"
TouchscreenNon-Touch Screen
Display TypeUHD+
Resolution3840 x 2400
Refresh Rate120Hz
Display FeaturesMini LED HDR
GPU/VPUNVIDIA GeForce RTX 5090 Laptop GPU
SSD4TB
HDDNo
Storage Spec4 TB M.2 PCIe 4.0 x4 NVMe SSD
Memory Speed5600MHz (Speeds subject to system capability)
Memory Spec2 x 32 GB
Max Memory Supported128GB
LAN2.5GbE Lan
WLAN802.11 be Wi-Fi 7
BluetoothBT 5.4
USB2x Type-A USB3.2 Gen2
Thunderbolt2x Type-C (USB4® / DisplayPort™/ Power Delivery 3.1/ Thunderbolt™ 4 compatible)
HDMI1x HDMI™ 2.1 (8K @ 60Hz / 4K @ 120Hz)
Audio Ports1x Mic-in/Headphone-out Combo Jack
TouchpadMulti Touch
KeyboardSteelSeries per-Key RGB with Anti-Ghost key (99 Key)
WebcamIR FHD w/shutter
Card ReaderSD Express Card Reader
StyleStandard
TypeGaming
UsageConsumer
AC Adapter/Charger280W
Battery4 cell (90Whr) Li-Ion

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Does the Stealth A18 AI+ A3XWJG-006US ship with a power brick and documentation, or must I buy a charger separately?

The laptop includes the MSI power adapter and standard documentation in the box; no separate charger purchase is required.

Which display configuration is fitted to the Stealth A18 AI+ A3XWJG-006US?

It uses the 18 inch UHD+ Mini LED panel at 3840 x 2400 resolution with a 120 Hz refresh rate.

What does the RTX 5090 with 24 GB GDDR7 deliver for 4K gaming on the built-in 120 Hz panel?

The 24 GB GDDR7 frame buffer and GPU compute let you run modern titles at native 3840 x 2400 with high settings while the 120 Hz panel shows every frame the GPU produces.

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