RAM-modules recovery walkthrough
Reference · Recovery walkthrough
A “category-of-one” consolidation: a RAM stick is multi-component scrap, with flash-gold on the connector edge AND SMD tantalum capacitors on the component side. This walkthrough identifies the stick, classifies the generation, then funnels you to the sibling procedures for each fork — /guide/recovery/gold-fingers for the connector and /guide/recovery/capacitor for the on-board caps — plus residual FR4 substrate value on /boards. Always cross-check your local environment agency’s guidance before handling acids.
Step 1
Before you start
Make sure you have what you need before the first snip OR the first hot-air pass. A RAM walkthrough is two forks in PPE: cut + dust first, then hot air if you also tackle the caps. Trying to improvise the PPE half-way through is what causes most accidents.
- Confirmed the part is a RAM module via /guide (gold-finger-ram row)
- Classified the generation (SDRAM / DDR / DDR2 / DDR3 / DDR4 / SO-DIMM / SIMM / RIMM) — drives Au plating and cap presence
- Photographed both sides of the stick — gold-finger side and component side
- Logged the PCB label (capacity, PC# / generation, OEM) where readable
- Weighed the intact stick on a 0.01 g scale and logged the reading
- ESD mat grounded; wrist strap on; cut-resistant glove under the nitrile
- Decided which fork applies: gold-finger first, or capacitor first, or both
Step 2
PPE & safety
PPE is mandatory — not optional.
A RAM stick is multi-component scrap: you may end up snipping gold fingers AND desoldering tantalum caps off the same part. PPE differs by step. Lead-bearing solder, sharp-cut gold fingers, hot-air venting tantalum caps, and ESD-sensitive DRAM all converge in the same workflow. The PPE below is mandatory across the consolidated scope — individual sub-walks (gold-fingers, capacitor) carry the per-step detail.
- · Chemical-splash goggles — gold-finger snips and tantalum-cap desoldering share the eye hazard
- · Nitrile gloves (not latex); replace at first pinprick — gold fingers are razor-sharp
- · Lab coat or chemical apron, buttoned, sleeves down
- · FFP3 or P100 respirator — solder / ceramic dust and (where tant caps are present) Ta₂O₅ vapour
- · Cut-resistant gloves for any gold-finger snip step
- · ESD wrist strap — DDR4 modules are ESD-sensitive even when unpowered
- · Fume cupboard if you take the optional chemical route on either tack (aqua regia for fingers, HF / H₂SO₄ for caps)
- · Eyewash station or neutralising agent within arm’s reach
- · Calcium gluconate gel if HF is anywhere near the workflow
Step 3
Decide which fork — connector, capacitor, or both
Two forks, never combined.
A RAM stick is a "category-of-one" walkthrough because it bundles TWO recoverable flows onto one part. The decision tree is short: (1) If the connector edge shows actual gold — verify with a loupe and any available XRF — fork to /guide/recovery/gold-fingers for snip-and-strip. (2) If the stick carries SMD tantalum capacitors in the DRAM-area, SPD, or power-section clusters, fork to /guide/recovery/capacitor for hot-air desoldering. (3) The residual FR4 substrate is low-yield per stick but accumulates across a board lot — list the shred on /boards for FR4-tier yard quotes.
Step 4
Tools
Three groups. Mechanical tools cover both forks in PPE; chemical tools only if your jurisdiction and environmental permit allow the corresponding refinement; verification tools always, so each fork has a clean paper trail to the yard.
- ESD mat + wrist strap — DDR4 & all DRAM-area work is ESD-sensitive
- Sharp flush cutters — gold-finger snipping WILL draw blood through thin nitrile
- Cut-resistant gloves underneath the nitrile, for any snip step
- Hot-air rework station (~350 °C, medium nozzle) — for the capacitor fork
- Two-tweezer technique — tantalum-cap lift with one gripping, one rocking
- Soft antistatic brush — sweep fingers off the stick without contamination
- Glass collection dish (never metal — ferrous shavings taint the gold lot)
- Borosilicate glass beakers only — never metal or unknown plastic
- HCl + HNO₃ in 3:1 ratio for aqua regia (gold-finger fork, where legal)
- HF, H₂SO₄ or HNO₃ baths for tantalum refining (capacitor fork, where legal)
- Fume cupboard with verified face velocity — both forks need one
- pH strips for bath validation
- Spill neutralising agent within reach
- Jeweller's loupe (10×) or a stereo microscope
- Digital scale, 0.01 g resolution
- Glass weighing boat
- Sample vials for retained finger / cap samples (label per fork)
- XRF if you have access — invaluable for plating-thickness confirmation on the gold fork
- Generation label / PC# notes for any yard quote — class drives the band
Step 5
On-board locations
Where the multi-component recovery pays off by stick class. The cards link to the matching sibling walkthrough — /guide/recovery/gold-fingers for connector-edge maps, /guide/recovery/capacitor for on-stick cap clusters.
Older-generation desktop DIMMs carry the heaviest gold plating AND frequently host tantalum decoupling caps around the SPD and power pins. The “best of both worlds” for multi-component recovery on a single stick.
See sibling walkthrough →DDR3 / DDR4 commonly drop gold entirely in favour of tin / ENIG finishes — most sticks in this class have negligible Au. Cap density around the DRAM area is still meaningful on populated server sticks, less so on consumer.
See sibling walkthrough →SO-DIMMs follow the same desktop convention by generation but with smaller board area — lower per-stick yield, larger per-lot yield. SDRAM-class SO-DIMMs (laptops from the early-2000s) are particularly worth sorting.
See sibling walkthrough →Pre-DDR SIMMs and Rambus RIMMs carry the heaviest gold plating and the largest per-stick Au yield of any consumer memory class. Often paired with through-hole tant bead caps; cap density varies by OEM.
See sibling walkthrough →Registered server DIMMs are physically larger and carry more bulk tantalum decoupling caps than consumer DIMMs of the same generation. Registered buffers also pull in extra low-ESR polymer caps alongside ceramic MLCCs.
See sibling walkthrough →When RAM is soldered onto a GPU riser or ASIC hash board rather than a stick, recovery crosses into a different scope (the hash board itself, not the stick). Cross-link the capacitor and gold-finger walks by part id, not by stick form factor.
See sibling walkthrough →Step 6
Mechanical extraction — both forks on one stick
The default route is mechanical-only, fork-by-fork. The two scrolls below are condensed pointers to each sibling walkthrough. Read the full procedure on its own page before committing.
Identify and classify the generation
Confirm the part is a RAM module via /guide (gold-finger-ram row). Read the label for capacity and PC# — both drive the class. Photograph both sides (gold-finger side AND component side). Weigh the intact stick on a 0.01 g scale. Older SDRAM / AGP-class cards pay far better than DDR4; a confirmed generation saves you worthless snip-and-strip work on DDR4.
ESD strap on, photograph, weigh
ESD wrist strap on before the stick touches anything else. Re-photograph the populated stick in good light and weigh on a 0.01 g scale — the yard needs the “before” weight as the denominator.
Decide the fork: connector or capacitor
Inspect the connector edge: is there a real Au layer, or just an ENIG / tin finish that looks gold-coloured? Inspect the component side: are there SMD tantalum capacitors? If both apply, run the gold-finger fork first (cleaner cut, less scratch risk), then the capacitor fork (tolerates a stick that’s already been end-snipped). The two outputs go to separate glass dishes — never combine Au and Ta in one batch.
Gold-finger fork: snip-and-strip
Cut the connector end off the stick with flush cutters, leave the finger block intact, snip fingers off the substrate onto a glass dish. Sweep with a soft brush. Verify with the loupe against a nickel underlayer. Full procedure is the connector walkthrough — /guide/recovery/gold-fingers handles PPE, tools, mechanical steps, and the optional aqua-regia route.
Capacitor fork: hot-air desolder
Pre-heat with the rework station ~350 °C, two-tweezer lift, drop onto the glass dish. Tantalum electrolytics vent above ~250 °C — keep exposure brief. Full procedure — PPE, mechanical and chemical routes, verification — is the capacitor walkthrough at /guide/recovery/capacitor.
Residual FR4 substrate
After both forks, the residual FR4 substrate (glass-fibre / epoxy board minus the recovered components) is low-yield per stick but accumulates across a board lot. Shred the residual substrate, weigh, photograph, and list the shred on /boards under the FR4 tier for the yard quote
Step 7
Verify, weigh, and list
Weigh EACH fork (gold-finger fork on dish A, capacitor fork on dish B) on a 0.01 g digital scale; never mix the two on one dish. Photograph each dish with the reading and retain a labelled sample vial for each. The two forks need two yard quote paths — a yard quoting a stick batch for Au will not co-quote it for Ta.
Compare each fork against its own expected yield band. Gold-finger fork: ~0.05–0.3 g Au per kg of finger-rich scrap. Capacitor fork: ~0.3–0.6 g Ta per kg of capacitor-rich scrap. Combined on the same stick: ~0.05–0.6 g Au + Ta per kg of stick scrap (combined, class-dependent). These are wide bands, not yard quotes — class, plating thickness, cap density, and how clean each fork is all move the numbers.
List the two fork batches (and any residual FR4 shred) to /boards in separate listings to get assayed yard quotes before you commit. Yard quotes are a price floor; each fork stays in its own fork until you commit.
Yield reference
Indicative yield range
The figure below is an indicative range for the combined Au + Ta yield from a stick scrap lot, summing both forks. Individual forks have their own bands — see the sibling walkthroughs for the connector-fork band and the capacitor-fork band individually. Three public references back the broader recovery picture:
- USGS Gold & Tantalum — Annual statistics & information on Au and Ta supply, refining yields, and end-use demand.
- UNEP / PMC Critical Metals — Reporting on Au + Ta Stocks & Flows, secondary recovery rates, and e-waste refining pathways.
- Roskill / CRU — Commercial Au and Ta market reports tracking spot, refining economics, and recycling flows for e-waste scrap.
| Volume | Range (g/kg scrap) | Indicative point | Unit |
|---|---|---|---|
| RAM sticks (multi-component fork) | 0.05 – 0.6 | 0.25 | g Au + Ta / kg scrap |
Real per-lot recovery depends on stick class, plating thickness, cap density, lot purity, and your yard. Always sample-test before committing. See the /boards methodology for the broader yield derivation.
Frequently asked
FAQ
Yes — the two forks are independent. Run the gold-finger fork first (cleaner cut), then the capacitor fork (the stick is already end-snipped; hot-air still works). Keep the two outputs in separate glass dishes; never combine Au and Ta in one batch. The residual FR4 substrate goes on its own /boards listing under the FR4 tier.
No — DDR3 / DDR4 commonly drop gold entirely in favour of tin / ENIG finishes. The "gold" you see on a DDR4 stick is most often just nickel-with-a-gold-coloured-surface, no recoverable Au. Older SDRAM and DDR carry actual flash gold. Verify plating with a loupe or XRF before committing to snip-and-strip work — a DDR4 stick that looks gold is often not gold. The capacitor fork is more universally applicable, but cap density varies by generation.
It depends on the stick. SDRAM / AGP-class sticks pay best on the gold-finger fork (heavier plating, cleaner yield). Server DDR3 / DDR4 ECC RDIMMs pay better on the capacitor fork (higher cap density, more recoverable Ta). Commodity DDR3 / DDR4 sticks are often near-zero on both forks — verify before committing.
Per-stick, FR4 substrate is low-yield — most of the recoverable metal is in the components, not the substrate. Across a board lot, however, aggregate FR4 shred moves the needle: it is a yard-tier material with a steady quote floor. List FR4 shred on /boards under the FR4 tier; the substrate stays substrate until you commit.
Where to go next
Guide row ram-modules not yet seeded; rendering the static walkthrough above.