Why capacity is the number that matters
Boards that look identical can differ by a factor of eight in what they hold. The same model, the same year, the same visible condition — one is 16GB and one is 128GB. Nothing on the outside of the board tells you which. The phone will not boot to tell you either, because if it booted it would not be scrap.
That gap is where money is made and lost. A lot priced as high-capacity that turns out to be mostly entry-level stock is not a small disappointment; it is the whole margin. And it is not always deliberate on the seller's side — plenty of lots are sold on the assumption that a model number implies a capacity, which it does not.
The check, in practice
One chip, one string of characters, one lookup. The memory IC on a phone board carries a part number that maps to an exact capacity. Read it, check it, and you know what the board is before money moves.
- Get the shield off and find the large package next to the CPU. Full detail in how to identify the memory IC.
- Read the top line of the marking under raking light. The lines below it are lot and date codes.
- Check it in the IC checker. You get the storage, the package type, and the RAM if it is a stacked part.
Roughly fifteen seconds a board once you have the rhythm, and no power, cables or box required.
Sampling a lot instead of checking everything
Nobody is reading five hundred boards individually before a purchase. You do not have to.
- Pull the sample yourself, from the middle and bottom of the pile as well as the top. Lots get graded, deliberately or not, and the top layer is rarely representative.
- Ten to fifteen boards is usually enough to see whether a lot is what it was described as. You are not measuring precisely — you are checking whether the description survives contact with the stock.
- Record the spread, not the average. "Eight of fifteen were 32GB" tells you more than a mean figure. Capacity distribution is what you are actually buying.
- Re-price from the sample and put the number to the seller. A lot that is genuinely mixed is still worth buying at a mixed-lot price.
What the capacity tiers mean commercially
Across the 16,776 parts in this catalogue, the mainstream phone capacities cluster into tiers that behave differently in the trade:
| Tier | Typical hardware | In the trade |
|---|---|---|
| 4–16GB | Older and entry-level budget phones, mostly eMMC and eMCP | Low value per board; usually only worth it as bulk weight |
| 32–64GB | The bulk of mid-range stock from the last several years | The volume tier — most lots are mostly this |
| 128–256GB | Recent mid-range and flagship, largely UFS and uMCP | Where harvested-chip value starts to justify the work |
| 512GB–1TB | Flagship only, UFS 3.x and above | Uncommon in mixed scrap; worth pulling out and pricing separately |
Note the split by package. The low tiers are dominated by the older parallel-interface parts — 3,418 eMMC and 6,434 eMCP records in this catalogue — while the high tiers are almost entirely UFS and uMCP (4,909 and 1,065 respectively). That matters when you are harvesting, because the two families are not interchangeable. See eMMC vs UFS vs eMCP.
Signals that a lot has been picked over
- Shields already removed on some boards. Somebody has been looking. The question is what they took.
- Flux residue or reball marks around the memory package. The high-capacity chips may already be gone and replaced with whatever was cheap.
- Uniformly low capacity across a random sample of a lot advertised as mixed. Mixed lots are genuinely mixed; uniform ones have been sorted.
- Polished or blank memory packages. An unmarked chip cannot be verified visually. Price those as unknown, not as the capacity you hope they are.
Sorting your own stock
The same check works in the other direction. If you are the one selling, reading the chip on every board and sorting into capacity bins turns an averaged mixed lot into graded stock that prices per tier. That is generally worth more than the labour costs, particularly once 128GB and above are separated out.
The mobile IC code list groups the common part numbers by capacity, which is quicker than a lookup once you start recognising the codes you see most.