PC Build to Run InternLM 3 20B Instruct Locally (Q4_K_M)

Written by Jakub Rusinowski · Last updated January 15, 2025

A complete parts list — GPU, motherboard, RAM and PSU — worked backward from InternLM 3 20B Instruct's VRAM requirement at Q4_K_M. Prices are 2026 street estimates and vary.

Requirements

VRAM required~13 GB at Q4_K_M
System RAM32 GB
Estimated speed~16 tok/s
Complete build (est.)$979
Buy This HardwareAMD Radeon RX 9060 XT 16GB — 16 GB VRAM · 160 W board powerDeploy in the Cloud NowRTX 4090 on RunPod — from $0.34/hr · rate checked 2026-07

or compare on Vast.ai from $0.35/hr (typical low · varies)

As an Amazon Associate we earn from qualifying purchases. Cloud GPU links are referral links — we may earn a commission at no extra cost to you.

Affiliate disclosure: Some links on this page are affiliate links — if you buy through them, LLM Configurator may earn a commission at no extra cost to you. As an Amazon Associate, LLM Configurator earns from qualifying purchases.

GPU: AMD Radeon RX 9060 XT 16GB

AMD Radeon RX 9060 XT 16GB's 16 GB covers InternLM 3 20B Instruct at Q4_K_M (~13 GB needed), with headroom.

AMD Radeon RX 9060 XT 16GB
16 GB VRAM · 160 W board power
2026 prices are volatile — check the current listing.
Check price on Amazon

Motherboard: MSI MAG B550 Tomahawk

B550 (AM4) — pairs with the AMD Ryzen 5 5600; DDR4, dual PCIe 4.0 x16 (x8/x8) for multi-GPU, 4 DIMM slots to 128 GB.

MSI MAG B550 Tomahawk
2026 prices are volatile — check the current listing.
Check price on Amazon

RAM: Corsair Vengeance LPX 32GB (2x16GB) DDR4-3600 C18 PREVIEW

32 GB DDR4-3600 (2x16GB) meets InternLM 3 20B Instruct's 32 GB recommended system RAM.

32GB DDR4-3200 Kit (2x16GB)
2026 prices are volatile — check the current listing.
Check price on Amazon

PSU: Corsair RM650e (ATX 3.1)

650 W 80+ Gold covers AMD Radeon RX 9060 XT 16GB (160 W) + CPU 65 W with 30% headroom (~293 W required).

Corsair RM650e (ATX 3.1)
2026 prices are volatile — check the current listing.
Check price on Amazon

Swap Alternatives

FAQ

What GPU do I need to run InternLM 3 20B Instruct at Q4_K_M?

AMD Radeon RX 9060 XT 16GB's 16 GB covers InternLM 3 20B Instruct at Q4_K_M (~13 GB needed), with headroom.

How much VRAM does InternLM 3 20B Instruct need at Q4_K_M?

About 13 GB of VRAM plus 32 GB of system RAM.

What power supply does a AMD Radeon RX 9060 XT 16GB build need?

650 W 80+ Gold covers AMD Radeon RX 9060 XT 16GB (160 W) + CPU 65 W with 30% headroom (~293 W required).

How much does a InternLM 3 20B Instruct PC cost?

About $979 for a complete build (GPU, motherboard, RAM, PSU, CPU, case, SSD), at 2026 street-price estimates.

InternLM 3 20B Instruct at Other Quant Levels

Other Popular Build Targets

Model & GPU

More Ways to Build

← Budget-first build recommender | InternLM 3 model page | AMD Radeon RX 9060 XT 16GB review