Relative Value56balanced preset
Silicon Power UD90 2TB vs Western Digital Black SN770 2TB — value comparison
Relative Value62balanced preset
Western Digital Black SN770 2TB shows higher Relative Value under balanced weights at the current dataset offers: 62 vs 56. The result crosses over if Silicon Power UD90 2TB reaches about $242 or below.
Price data · US · USD · New · A 2026-08-21 · B 2026-08-21Coverage · 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.
Checking today's prices… This shared scoring frame includes an offer with a 24-hour freshness window, so price-derived results finish loading in your browser a moment from now. Capability, performance and verified specifications are already final.
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 | Silicon Power UD90 2TB | Western Digital Black SN770 2TB |
|---|---|---|
| System Drive | A#146 | A#132 |
| Game & File Storage | A#105 | A#122 |
| Heavy Creative Work | B#166 | A#119✓ |
Western Digital Black SN770 2TB grades higher in 1 of 3 graded scenarios (2 tied) and is never graded lower. These are the same S–F grades as the tier list — capability only, price excluded. The value rows below add prices from the 2026-08-21 offer frame. How tiers are assigned →
Relative Value by priority
Balancedhigher relative value lit
56
62 ✓
System Drivehigher relative value lit
15
19 ✓
Game & File Storagepractically even (≤3 pts)
72
73
Heavy Creative Workhigher relative value lit
11
16 ✓
Strict Budgetpractically even (≤3 pts)
46
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.
Crossover price is loading. The switch-over point and Strong Value threshold appear as soon as today's offer snapshots are confirmed in your browser.
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 · Silicon Power UD90 2TB
- Current dataset offer · NewUS · USD · snapshot 2026-08-21
- Check current price on Amazon
- Beats Western Digital Black SN770 2TB atbalanced weights; rival offer held fixed
- $242
- Strong Value at80+ Relative Value threshold
- $167
B · Western Digital Black SN770 2TB
- Current dataset offer · NewUS · USD · snapshot 2026-08-21
- $285
- Beats Silicon Power UD90 2TB atbalanced weights; rival offer held fixed
- $330
- Strong Value at80+ Relative Value threshold
- $196
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
5000
5150
5150
Sequential read (MB/s)
5000
5150
5150
Sequential write (MB/s)
3200
4850
4850
A · Silicon Power UD90 2TBB · Western Digital Black SN770 2TBEach row keeps the unit or category index named in its label; bar length compares A and B within that row.Western Digital Black SN770 2TB shows higher Value under every weighting we test — a stable result in the 2026-08-21 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 · Silicon Power UD90 2TB
- InterfaceM.2 PCIe 4.0 x4
- Form factorM.2-2280
- Capacity2,000 GB
- Heatsink includedNo
- Write endurance1,200 TBW
- Warranty (typical new)60 mo
B · Western Digital Black SN770 2TB
- InterfaceM.2 PCIe 4.0 x4
- Form factorM.2-2280
- Capacity2,000 GB
- DRAM cacheDRAM-less
- Heatsink includedNo
- Write endurance1,200 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 | Silicon Power UD90 2TB | Western Digital Black SN770 2TB |
|---|---|---|
| Interface | M.2 PCIe 4.0 x4 | M.2 PCIe 4.0 x4 |
| Form factor | M.2-2280 | M.2-2280 |
| Capacity | 2,000 GB | 2,000 GB |
| Sequential read | 5,000 MB/s | 5,150 MB/s✓ |
| Sequential write | 3,200 MB/s | 4,850 MB/s✓ |
| Write endurance | 1,200 TBW | 1,200 TBW |
| DRAM cache | not tracked | DRAM-less |
| NAND type | not tracked | SanDisk 112-layer TLC |
| Controller | not tracked | SanDisk Proprietary |
| Heatsink included | No | No |
| Current dataset offer · New | Check current price on Amazonsnapshot 2026-08-21 | $285snapshot 2026-08-21 |
| 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 $85 cheaper · Value 100.
Neither of the two above is the only answer — this one clears the same bar for less. ⇄ Compare all three
A price-aware third suggestion appears once today's offer snapshots are confirmed in your browser.
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 · Silicon Power UD90 2TB if…
- You can find it at or below its Strong Value threshold of $167 under balanced weights.
Choose B · Western Digital Black SN770 2TB if…
- You prioritize Heavy Creative Work — it earns the higher capability tier in those tracked scenarios.
- Your priorities resemble Balanced, System Drive, Heavy Creative Work — it has higher Relative Value under those presets at the snapshot offers.
- You can find it at or below its Strong Value threshold of $196 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: Silicon Power UD90 2TB or Western Digital Black SN770 2TB?
- Under the balanced preset and the 2026-08-21 offer frame, Western Digital Black SN770 2TB has higher Relative Value under this configuration (62 vs 56). 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?
- Western Digital Black SN770 2TB grades higher in 1 of 3 graded scenarios (2 tied) and is never graded lower.
- At what price does the Silicon Power UD90 2TB become the better value?
- Holding the Western Digital Black SN770 2TB offer dated in the 2026-08-21 frame fixed, the calculation flips in favour of the Silicon Power UD90 2TB at roughly $242 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.
Get more from The Comparator
🧩 Embed this on your siteFree live value widgets — drop a deal monitor or comparison into your blog or article.
🔎 Price a used listingPaste any marketplace listing and score it against today's market in the calculator.
✏️ Found a data error?Tell us — we keep prices and specs honest, dated and corrected fast.
Offer frame: 2026-08-21 · dataset generated 2026-08-21 · 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