Relative Value81balanced preset
Lexar NQ780 4TB vs Western Digital SN7100 4TB — value comparison
Relative Value75balanced preset
Lexar NQ780 4TB shows higher Relative Value under balanced weights at the current dataset offers: 81 vs 75. The result crosses over if Western Digital SN7100 4TB reaches about $499 or below.
Price data · US · USD · New · A 2026-09-02 · B 2026-09-02Coverage · 4 tracked new-offer records across both modelsBenchmark confidence · no estimate flags on these two recordsAffiliate links · We may earn a commission from these links. Scores are calculated separately using our methodology.
02 · Decision matrix
One decision, three separate questions
Capability ignores price. Relative Value adds the current dataset offers and your priorities. Keeping them separate prevents a cheap product from being mistaken for the faster product.
The decision, split by questioncapability · value · price are separate answers
Capability by task
| Scenario | Lexar NQ780 4TB | Western Digital SN7100 4TB |
|---|---|---|
| System Drive | S#107 | S#113 |
| Game & File Storage | S#23 | S#44 |
| Heavy Creative Work | S#99 | S#73 |
They grade identically in all 3 graded scenarios — the tier table won't decide this one, so compare price and Value below. These are the same S–F grades as the tier list — capability only, price excluded. The value rows below add prices from the 2026-09-02 offer frame. How tiers are assigned →
Relative Value by priority
Balancedhigher relative value lit
81 ✓
75
System Drivepractically even (≤3 pts)
29
29
Game & File Storagehigher relative value lit
97 ✓
89
Heavy Creative Workpractically even (≤3 pts)
31
31
Strict Budgethigher relative value lit
53 ✓
47
Both products are normalized within the same in-stock market frame per preset. A check marks the higher Relative Value; a difference of 3 points or less is shown as practically even.
03 · Price crossover
The price changes the answer
Current offers, crossover points and Strong Value thresholds answer different questions. Thresholds are calculations, not price forecasts.
A · Lexar NQ780 4TB
- Current dataset offer · NewUS · USD · snapshot 2026-09-02
- $480
- Beats Western Digital SN7100 4TB atbalanced weights; rival offer held fixed
- $529
- Strong Value at80+ Relative Value threshold
- $486
B · Western Digital SN7100 4TB
- Current dataset offer · NewUS · USD · snapshot 2026-09-02
- $550
- Beats Lexar NQ780 4TB atbalanced weights; rival offer held fixed
- $499
- Strong Value at80+ Relative Value threshold
- $506
04 · Capability
Capability indexes, side by side
Price is intentionally excluded here so the more capable product and the better-value product cannot be confused.
Drive capability
7000
7000
7000
Sequential read (MB/s)
7000
7000
7000
Sequential write (MB/s)
6000
6700
6700
A · Lexar NQ780 4TBB · Western Digital SN7100 4TBEach row keeps the unit or category index named in its label; bar length compares A and B within that row.Lexar NQ780 4TB shows higher Value under every weighting we test — a stable result in the 2026-09-02 offer frame.
05 · Platform & ownership
Fit, compatibility and ownership context
Only verified structured compatibility and ownership fields are shown. Check the exact system, board manual and vendor QVL before purchase; missing fields are never guessed.
A · Lexar NQ780 4TB
- InterfaceM.2 PCIe 4.0 x4
- Form factorM.2-2280
- Capacity4,000 GB
- Heatsink includedNo
- Write endurance2,400 TBW
- Warranty (typical new)60 mo
B · Western Digital SN7100 4TB
- InterfaceM.2 PCIe 4.0 x4
- Form factorM.2-2280
- Capacity4,000 GB
- DRAM cacheDRAM-less
- Heatsink includedNo
- Write endurance2,400 TBW
- Warranty (typical new)60 mo
06 · Specifications
Key specifications
Directional checkmarks appear only on numeric fields where more or less has a clear meaning. They are not an overall verdict.
| Specification | Lexar NQ780 4TB | Western Digital SN7100 4TB |
|---|---|---|
| Interface | M.2 PCIe 4.0 x4 | M.2 PCIe 4.0 x4 |
| Form factor | M.2-2280 | M.2-2280 |
| Capacity | 4,000 GB | 4,000 GB |
| Sequential read | 7,000 MB/s | 7,000 MB/s |
| Sequential write | 6,000 MB/s | 6,700 MB/s✓ |
| Write endurance | 2,400 TBW | 2,400 TBW |
| DRAM cache | not tracked | DRAM-less |
| NAND type | not tracked | SanDisk BiCS8 TLC |
| Controller | not tracked | SanDisk Custom |
| Heatsink included | No | No |
| Current dataset offer · New | $480snapshot 2026-09-02✓ | $550snapshot 2026-09-02 |
| Warranty (typical new) | 60 mo | 60 mo |
“Not tracked” means the source data does not contain a verified value; no default or guessed specification is substituted.
07 · Customize
Try other models and your own priorities
Presets are starting points. Swap either side, then open Advanced weights only if you want to tune the formula directly.
08 · Alternative
A third option worth checking
The same scenario and market frame checks whether another currently priced model offers a cleaner trade-off.
Worth considering instead
Crucial T710 1TB — same S-tier capability for System Drive, about $270 cheaper · Value 100.
Neither of the two above is the only answer — this one clears the same bar for less. ⇄ Compare all three
09 · Decision guide
Choose based on the trade-off you actually want
These are evidence-linked conditions, not universal buying verdicts. Feature ecosystems, software support and platform preferences remain your call.
Choose A · Lexar NQ780 4TB if…
- Your priorities resemble Balanced, Game & File Storage, Strict Budget — it has higher Relative Value under those presets at the snapshot offers.
- You can find it at or below its Strong Value threshold of $486 under balanced weights.
Choose B · Western Digital SN7100 4TB if…
- You can find it at or below its Strong Value threshold of $506 under balanced weights.
10 · Methodology & FAQ
Read the methodology →How to read this comparison
The formula is a linear weighted sum inside the current comparison frame. Capability, price and user priorities stay visible as separate inputs so the result can be challenged and changed.
- Which is better value right now: Lexar NQ780 4TB or Western Digital SN7100 4TB?
- Under the balanced preset and the 2026-09-02 offer frame, Lexar NQ780 4TB has higher Relative Value under this configuration (81 vs 75). Value is price-dependent and moves with your weighting; capability is a separate question, answered by the tier table.
- Which one is more capable, ignoring price?
- They grade identically in all 3 graded scenarios — the tier table won't decide this one, so compare price and Value below.
- At what price does the Western Digital SN7100 4TB become the better value?
- Holding the Lexar NQ780 4TB offer dated in the 2026-09-02 frame fixed, the calculation flips in favour of the Western Digital SN7100 4TB at roughly $499 or below (balanced preset). Not a price forecast.
- Where can I compare current offers for both?
- Dated offer snapshots for both models are listed on their product pages (linked above); the interactive calculator recalculates both with your own weights and budget.
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Offer frame: 2026-09-02 · dataset generated 2026-09-02 · formula ssd-value-v1.5-benefit-cost-product · Value Score is an estimate based on our current dataset, selected weights, market prices and methodology — not an official product rating or a price forecast. Target prices are calculation thresholds, not predictions. Methodology · Report a data error