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Thank you for contacting Intel Communities.
The Intel® Celeron® Processor G3930 does support ECC Memory as stated on the specifications site.
You can also confirm this information by checking the product's datasheet:
Datasheet, Vol. 1: 7th Gen Intel® Processor Family for S Platforms > Page 19 > 2.1.1 System Memory Technology Supported > Tables 2-3, 2-6, and 2-8
Hope this information helps.
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