A single working surface for the Shenzhen-to-Bangkok arbitrage on 8/16 GB DDR4 SODIMM at 2666/3200 MT/s. Landed cost live-calculated with Form E, freight and FX; supplier scorecard, tryout batch, and daily news, in one page.
FX pulled live from open.er-api.com. Landed cost is for the star SKU (16 GB 3200) at the workbook's used-refurb wholesale of $22 with Form E and sea LCL freight.
Change any input; the breakdown recomputes. Post-Jan-2026 Thai customs: no more THB 1,500 exemption — 7% VAT applies on CIF+duty on every parcel.
A 70-stick tryout is light and small (roughly 5 kg, ~30×20×10 cm). At that size, LCL sea's fixed origin/destination fees eat the per-stick advantage; air express usually wins on total cost + speed.
| Mode | Carrier examples | Transit | Per-stick freight | Tryout batch cost | Notes |
|---|---|---|---|---|---|
| Air express Recommended (tryout) | DHL, FedEx, UPS, SF Express | 3–5 days | $2.15–$2.85 | $150–$200 | Door-to-door, tracked, Form E friendly, no consolidation delay |
| Sea LCL | Freight forwarder (Superbuy, Wise-Cargo, Bansar) | 15–25 days | $1.50 (at ≥50 pcs) | $180–$260* | *Fixed origin/destination fees inflate small parcels; economical from ~500 pcs |
| China–Thai overland | Kerry, Best, J&T cross-border | 5–10 days | $2.00–$4.00/kg | $120–$180 | Cheapest for small parcels; documentation is spottier — verify Form E acceptance |
All-in freight figures include origin pickup, brokerage, and Thai last-mile. Confirm with 2–3 forwarder quotes before booking; rates move week-to-week.
Three price tracks per SKU: original workbook (Jul 2026), current Sept 2026 wholesale range from Alibaba/refurb dealer scans, and the new landed cost implied at midpoint.
DDR4 SODIMM kit contract prices are up 277–380% since Q1 2025 (TrendForce). Q1 2026 conventional DRAM +90–95% QoQ; Q2 forecast +58–63%; Q3 DDR4 8Gb +50%. Spot is trading 172% above contract — sign of severe scarcity, not price discovery.
Samsung + SK Hynix delayed DDR4 phase-out into 2026 (some further) — they're "milking the shortage" (wccftech, Sep 2025 → confirmed Jan 2026). Micron transferred some DDR4 to Fab 6 Virginia without adding capacity.
What this means for you: your July workbook wholesale numbers ($11–52 range) are now 40–80% too low. Margins on used-refurb still compute favourably because Thai retail moved in lockstep, but expect suppliers to quote higher than the Feifan sheet, and expect the arbitrage window to compress as Thai wholesalers repopulate their books at the new global rates. Tryout now, before Q4 contract cycle prints again.
| SKU (DDR4 SODIMM) | Workbook Jul '26 (USD) | Sept '26 wholesale (USD) | Sept '26 used-refurb (USD) | TH retail est (THB) | Margin at midpt | Priority |
|---|---|---|---|---|---|---|
| 8 GB · 2666 | $11 | $28 – $42 | $18 – $28 | 1,300 – 1,700 | ~24% | High ★ |
| 8 GB · 3200 | $13 | $37 – $45 | $22 – $32 | 1,500 – 1,950 | ~26% | High ★ |
| 16 GB · 2666 | $19 | $58 – $80 | $34 – $50 | 2,400 – 3,100 | ~30% | High ★★ |
| 16 GB · 3200 ★ star SKU | $22 | $64 – $95 | $40 – $58 | 2,800 – 3,700 | ~32% | BEST ★★★ |
| 32 GB · 3200 | $52 | $135 – $195 | $82 – $120 | 5,200 – 6,800 | ~25% | Grow ★★ |
| DDR5 SODIMM · 16 GB · 5600 (surging) | — | $175 – $240 | — | 6,500 – 8,400 | ~22% | Phase 1.5 ★★ |
| DDR5 SODIMM · 32 GB · 5600 (watch — TechRadar flagged $500 module scenario) | — | $310 – $460 | — | 11,500 – 15,500 | ~20% | Watch |
Data as of Sept 10, 2026 · WebSearch-refreshed. Wholesale ranges: Alibaba MOQ-dependent bands (lower = ≥500 pcs, higher = ≤50 pcs, brand-name IC premium). Used-refurb: bigdatasupplyinc / KimoStore / Jawa / eBay lot pricing. Thai retail: modelled at 5.2× Sept wholesale midpoint (matches your workbook's 3.7× multiplier on the older $22 → 2,300 THB, escalated by the same 40% Thai retail move). Verify with 3 live supplier RFQs before committing capital.
Sources: TrendForce spot Jun 2026 · wccftech Q3 2026 +50% · TechPowerUp server DRAM +50% · Tom's Hardware DDR4 lifespan · TechRadar $500 32GB DDR5 · wccftech phase-out delay · Alibaba wholesale scan
Every platform bites twice: commission on the sale, and ad spend to win the click. Set your monthly units and channel mix; the table computes each channel's take, ad burn, and the blended net you keep.
| Channel | Mix % | Units | Revenue (THB) | Commission % | Txn fee % | Service/Xtra % | Ad spend % | Per-order fixed (THB) | Total take (THB) | Take % |
|---|---|---|---|---|---|---|---|---|---|---|
| Blended · rate % | — | — | — | — | — | — | — | — | — | — |
| Column subtotal (THB) | expenses by category ↓ | — | — | — | — | — | — | ← grand total | ||
Gross revenue minus commissions, txn fees, service, ads and per-order fixed. This is what hits your account before cost-of-goods.
Uses landed COGS at current calculator settings. If this dips below ~15%, either raise retail or shift mix toward lower-fee channels (Kaidee, FB).
Total ad spend ÷ monthly units. Watch it against your gross-profit-per-unit — if CPA > GP/unit, you're paying to lose money.
How to use: edit any cell in the table (mix %, fee rates, ads) — everything recomputes instantly. Mix % must sum to 100 (indicator on total row). Defaults are current Thai e-commerce benchmarks; verify at each platform's current fee page since Shopee/Lazada retune quarterly.
Fee references: Shopee TH seller fees · Lazada TH seller centre · TikTok Shop TH · FB Marketplace · Kaidee
A concrete 4-week sequence built around a 70-stick, four-SKU tryout at ~56,600 THB / ~$1,620 capital. Small enough to burn if the supplier flakes, large enough to prove the funnel.
Open Trade Assurance account, send RFQ template below to 5–8 suppliers with Verified Supplier ≥ 3 yrs, ≥97% response rate, ≥95% on-time shipment.
Order 3–5 pcs per top-2 SKUs (~$150 total). MemTest86 4-pass + TM5 (1usmus_v3) 1 hr. Photograph every unit; keep IMEI-style serial log.
List the 3–5 tested samples on Shopee with a "90-day tested" badge and MemTest86 screenshot in the gallery. If they sell within 14 days, place the 70-stick order with Form E.
Place 70-stick bulk PO (Form E required in contract). While in transit, mirror the winning listings to Lazada, FB Marketplace, Kaidee, TikTok Shop.
| SKU | Qty | Landed (THB) | Total |
|---|---|---|---|
| 8 GB 2666 | 10 | 1,026 | 10,262 |
| 8 GB 3200 | 30 | 1,191 | 35,732 |
| 16 GB 2666 | 15 | 1,819 | 27,281 |
| 16 GB 3200 ★ | 15 | 2,111 | 31,672 |
| Total | 70 | — | ~104,947 |
Expected revenue ~156,750 THB · gross profit ~31,300 THB after 13.09% platform fee · ~30% ROI on capital before fixed costs · ~447 THB profit/stick. Capital ~$3,190 USD at current FX — up from ~$1,620 in the July workbook because global wholesale moved.
Subject: RFQ — DDR4 SODIMM 8/16GB 2666/3200 to Thailand (tryout + potential 500-pc/mo repeat) Hello, We are a Bangkok-based retailer sourcing DDR4 SODIMM for the Thai e-commerce market. Please quote the following: SKUs (all DDR4 SODIMM, 260-pin, 1.2V): 1) 8 GB · 2666 MT/s — qty 10 tryout / 100 pcs repeat 2) 8 GB · 3200 MT/s — qty 30 tryout / 200 pcs repeat 3) 16 GB · 2666 MT/s — qty 15 tryout / 100 pcs repeat 4) 16 GB · 3200 MT/s — qty 15 tryout / 100 pcs repeat Please confirm for each SKU: • Unit price EXW Shenzhen (USD), 70-pc tryout AND 500-pc/mo blanket • IC brand (SK Hynix / Micron / Samsung preferred) • Condition: new / used-tested / refurbished — state clearly • Testing method: MemTest86 pass count, burn-in hours, error tolerance • Warranty: minimum 60-day DOA replacement, ideally 90-day • Packaging: individually anti-static, retail box optional Trade terms: • Payment: Alibaba Trade Assurance, 30% deposit / 70% on BL or air waybill • Form E certificate (HS 8473.30.30) MUST be provided — this is a hard requirement • Commercial invoice and packing list at true declared value Logistics: quote both DHL/FedEx air express and sea LCL to Bangkok (BKK). If tryout QC passes (DOA ≤ 12%, MemTest86 clean), we will commit to a 500-pc/month repeat order for 6 months minimum. Please reply with: 1. Filled quotation table 2. Real photos of current stock (not stock images) 3. Sample MemTest86 report for one stick of each SKU 4. Business licence and export experience to Thailand Best regards, [Your name] [Company] · Bangkok, Thailand
Answer 10 questions per supplier. The score updates live. 75+ = GO for tryout · 55–74 = sample only · <55 = SKIP.
Honest read on the arbitrage window. The shortage is real through 2027 but not eternal — DDR4 inventory should not roll into 2028.
Strong on market timing and unit economics; weakest on operator bandwidth for testing labor at scale beyond ~300 sticks/month.
Cumulative units to cover 8,000 THB/mo fixed cost at current mix. Recomputes with calculator inputs.
Net profit on ~1.21M THB capital deployed and ~1,499 units sold. Conservative vs the original PDF's 3M THB projection.
DRAM/HBM/tariff headlines refresh on page load via Google News RSS. Equities link out to Yahoo Finance for the three suppliers whose capacity decisions drive spot prices.