Rows that contradict the documents
In some rows, the capacity in the table did not match the value in the manufacturer’s document:
| Code | In the table | In the manufacturer’s document |
|---|---|---|
| D9TXF | 1 GB | 3 GB (Micron MT52L768M32D3PU: 768M × 32 bit) |
| D9PNQ | 512 MB | 768 MB (Micron) |
| H9TKNNNAADAPLR-NGH | 1 GB | 1.5 GB (SK hynix, 12 Gb) |
| W978H6KBV | 256 MB | 32 MB (Winbond, 256 Mb) |
Where these errors may come from
We do not know the cause of every row; we only report what the documents show.
- Bits and bytes mixed up. In Winbond’s catalogue, W978H6KBV sits in the 256 megabit (Mb) section, which is 32 megabytes. The table’s “256 MB” most likely comes from misreading the unit.
- Unusual sizes. Two of the correct values, 768 MB and 1.5 GB, are not the familiar “round” sizes. Values like these are easy to get wrong in a table.
- Differences we cannot explain. For D9TXF the table says 1 GB; Micron’s part number shows 768M × 32 bit, which is 24 gigabit, which is 3 GB. We do not know why.
Rows without a document
For roughly half of the table we found no manufacturer document at all. That does not mean those rows are wrong. It only means they could not be verified.
What BoardVision does with these rows
- Rows that contradict a document are locked: BoardVision shows no capacity for those codes. In the current version that applies to 9 rows covering 7 codes.
- Rows backed by a manufacturer document are shown as confirmed. Rows resolved only through the manufacturer’s numbering rule carry a separate label, because that is weaker evidence.
- Brands with no supporting document, for example Toshiba-Kioxia, SanDisk, CXMT, YMTC and Foresee, are shown as “unverified”.
When you use a table
- Where possible, check a code’s capacity against the manufacturer’s own document.
- Look at the unit: Gb or GB?
- Treat a row with no source as a clue, not as a fact.
How a five-character code leads to a capacity in the first place is explained in D9XPZ: Why a Memory Chip Doesn’t Show Its Capacity.
Limits
- Reading accuracy with a real camera has not been measured yet, so we give no rate.
- BoardVision does not test a chip electrically and does not prove that a chip is genuine. The marking tells you what the chip claims to be.
- The iOS and Android versions are in development and not in the app stores yet. The version we use today is an internal macOS prototype.