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Midnight black 18 inch gaming laptop, slim profile, Mini LED display

MSI

MSI Stealth A18 AI+ A3XWJG 18" UHD+ 120Hz Mini LED Ryzen AI 9 HX 370 RTX 5090 64GB 8TB gaming

SKU CH-KCKK-AVWPX

An 18-inch UHD+ 120Hz Mini LED laptop with a 12-core Ryzen AI 9 HX 370 up to 5.1 GHz, RTX 5090 24GB GDDR7, 64GB DDR5 and 8TB NVMe SSD

  • Screen size18.0 in (45.7 cm)
  • ProcessorAMD Ryzen AI 300 Series
  • Graphics processorNVIDIA GeForce RTX 5090 Laptop GPU
  • Memory size64 GB
  • Storage drive8 TB M.2 PCIe 4.0 x4 NVMe SSD
  • Display resolution3840 × 2400

CPU Name AMD Ryzen AI 9 HX 370

Size 18.0"

Operating System Windows 11 Home

GPU NVIDIA GeForce RTX 5090 Laptop GPU

Memory 64GB

SSD 8 TB

  • 18-inch UHD+ Mini LED display at 120 Hz for vivid detail
  • Ryzen AI 9 HX 370 12-core processor up to 5.1 GHz for heavy workloads
  • RTX 5090 GPU with 24 GB GDDR7 for high-end graphics power
  • 64 GB DDR5 memory plus 8 TB NVMe SSD for massive capacity
  • Gelid GC Extreme thermal compound keeps temperatures lower under load

Purpose-built workstation

The Stealth A18 AI+ pairs a 12-core Ryzen AI 9 HX 370 processor with an RTX 5090 laptop GPU carrying 24 GB GDDR7. Sixty-four gigabytes of DDR5 5600 memory and an 8 TB NVMe drive give creative professionals and engineers the headroom for large models, timelines and datasets. Windows 11 Home ships pre-installed.

Custom thermal and storage upgrades

HIDevolution applies Gelid GC Extreme thermal compound to both CPU and GPU, lowering peak temperatures and reducing throttling during sustained loads. The 8 TB PCIe 4.0 x4 NVMe SSD is installed and validated before shipment, delivering maximum sequential throughput for project files and virtual machines. Every unit completes burn-in, benchmark, keyboard, touchpad, port and display verification.

Thin chassis with extensive I/O

The Midnight Black magnesium-aluminium body measures 15.74 by 11.41 by 0.94 inches and weighs 6.39 lbs, fitting an 18-inch 3840 x 2400 120 Hz Mini LED panel into a profile suited for desk or travel. A full complement of LAN, WLAN, USB and video connectors supports docks, external storage and multi-monitor rigs without dongles.

How it compares

Measured against everything we stock in Gaming Laptop Computers, at today’s prices. Recalculated every night.

Price $4,684.99
Pricier than about 90% of the 5,382 comparable items (median $1,978.99).
Screen size 18.0 in (45.7 cm)
Higher than about 90% of the 5,361 comparable items (median 16 in).
Refresh frequency 120 Hz
Lower than about 90% of the 2,443 comparable items (median 165 Hz).

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Specifications

Product
Brand nameMSI
Product lineMSI Stealth A18 AI+
Model nameStealth A18 AI+ A3XWJG-006US
Part numberMS-STEALTHA18AI3006-HID3
Product colorMidnight Black
Design styleStandard
Product typeGaming
Recommended useConsumer
Processor
ProcessorAMD Ryzen AI 9 HX 370
Processor modelAMD Ryzen AI 9 HX 370
CPU cores12-core Processor
Turbo clock speed5.1 GHz
L3 cache size36 MB
Memory
Memory size64 GB
RAM type and speed5600 MHz (Speeds subject to system capability)
Memory configuration2 × 32 GB
Maximum supported memory128 GB
Storage
Storage drive8 TB M.2 PCIe 4.0 x4 NVMe SSD
SSD storage8 TB
Hard driveNo
Storage configuration8 TB M.2 PCIe 4.0 x4 NVMe SSD
Display
Screen size18.0 in (45.7 cm)
Display resolution3840 × 2400
Refresh frequency120 Hz
Touch inputNon-Touch Screen
Display18 in UHD+ 120 Hz
Display formatUHD+
Screen featuresMini LED HDR
Graphics
Graphics processorNVIDIA GeForce RTX 5090 Laptop GPU
Video RAM24 GB
GPU modelNVIDIA® GeForce RTX™ 5090 Laptop GPU
Audio & video
Web cameraIR FHD w/shutter
Connectivity
NetworkingLAN and WLAN
LAN connection2.5GbE Lan
Wi-Fi802.11 be Wi-Fi 7
Bluetooth supportBT 5.4
Ports & slots
USB ports2x Type-A USB3.2 Gen2
Thunderbolt ports2x Type-C (USB4® / DisplayPort™/ Power Delivery 3.1/ Thunderbolt™ 4 compatible)
HDMI ports1x HDMI™ 2.1 (8K @ 60 Hz / 4K @ 120 Hz)
Audio jacks1x Mic-in/Headphone-out Combo Jack
Memory card readerSD Express Card Reader
Power
Power adapter280 W
Battery pack4 cell (90Whr) Li-Ion
Size & build
Overall dimensions15.74 in × 11.41 in × 0.94 in
Product weight6.39 lb (2.9 kg)
Software
Operating systemWindows 11 Home
More details
Pointing deviceMulti Touch
KeyboardSteelSeries per-Key RGB with Anti-Ghost key (99 Key)

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Questions about this item

Will the 64 GB DDR5 5600 MHz memory or the 8 TB NVMe SSD need replacement down the line?

The 64 GB DDR5 5600 MHz memory is soldered and not user-replaceable; the 8 TB NVMe SSD occupies an M.2 slot and can be swapped later if capacity or speed demands change.

What limit appears first when the Ryzen AI 9 HX 370 and RTX 5090 run sustained loads?

The 12-core CPU at 5.1 GHz turbo and 24 GB GDDR7 GPU share a compact vapor-chamber cooler, so thermal headroom typically caps performance before power delivery does.

How loud and hot does the 18-inch Mini LED chassis get during all-day use?

Gelid GC Extreme paste on both dies keeps surface temperatures lower than stock, and fan noise stays in the mid-40 dB range under continuous gaming loads.

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