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Question about DDR1

A simple question, what is the largest capacity that good old non-ECC DDR1 RAM came in?  I recently got a Windows XP machine and want to see how far I can take it.

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Off the top of my head I'd say 512MB, but I'm not totally sure.

Desktop: Intel Core i9-9900K | ASUS Strix Z390-F | G.Skill Trident Z Neo 2x16GB 3200MHz CL14 | EVGA GeForce RTX 2070 SUPER XC Ultra | Corsair RM650x | Fractal Design Define R6

Laptop: 2018 Apple MacBook Pro 13"  --  i5-8259U | 8GB LPDDR3 | 512GB NVMe

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1GB is the largest I'm seeing but the motherboard plays a role in the biggest supported size as well so you might want to make sure your board can handle 1GB sticks.

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Highest is 1GB, but if your board/CPU supports ECC Reg you can go up to 4GB/DIMM (server memory).

CPU : Core i7 6950X @ 4.26 GHz + Hydronaut + TRVX + 2x Delta 38mm PWM
MB : Gigabyte X99 SOC (BIOS F23c)
RAM : 4x Patriot Viper Steel 4000MHz CL16 @ 3042MHz CL12.12.12.24 CR2T @1.48V.
GPU : Titan Xp Collector's Edition (Empire)
M.2/HDD : Samsung SM961 256GB (NVMe/OS) + + 3x HGST Ultrastar 7K6000 6TB
DAC : Motu M4 + Audio Technica ATH-A900Z
PSU: Seasonic X-760 || CASE : Fractal Meshify 2 XL || OS : Win 10 Pro x64
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