Relative Value60balanced preset
Silicon Power UD90 4TB vs Western Digital Blue SN5000 4TB — value comparison
See current offers for Silicon Power UD90 4TB
Relative Value72balanced preset
Western Digital Blue SN5000 4TB shows higher Relative Value under balanced weights at the current dataset offers: 72 vs 60. The result crosses over if Silicon Power UD90 4TB reaches about $382 or below.
Price data · United States · USD · New · A 2026-09-28 · B 2026-09-28Coverage · 2 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 | Silicon Power UD90 4TB | Western Digital Blue SN5000 4TB |
|---|---|---|
| System Drive | A#159 | A#142 |
| Game & File Storage | S#45 | S#61 |
| Heavy Creative Work | B#184 | A#129✓ |
Western Digital Blue SN5000 4TB 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 2026-09-28 offer frame. How tiers are assigned →
Relative Value by priority
Balancedhigher relative value lit
60
72 ✓
System Drivehigher relative value lit
14
21 ✓
Game & File Storagehigher relative value lit
92
99 ✓
Heavy Creative Workhigher relative value lit
13
21 ✓
Strict Budgethigher relative value lit
45
50 ✓
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 · Silicon Power UD90 4TB
- Current dataset offer · NewUnited States · USD · snapshot 2026-09-28
- $500
- Beats Western Digital Blue SN5000 4TB atbalanced weights; rival offer held fixed
- $382
- Strong Value at80+ Relative Value threshold
- $329
B · Western Digital Blue SN5000 4TB
- Current dataset offer · NewUnited States · USD · snapshot 2026-09-28
- $470
- Beats Silicon Power UD90 4TB atbalanced weights; rival offer held fixed
- $615
- Strong Value at80+ Relative Value threshold
- $405
04 · Where to buy
Current offers for both products
Dated New-condition price snapshots for only the two products in this comparison. Confirm the final price and availability at the store.
A · Silicon Power UD90 4TB
New · United States · USDAmazon Affiliate
Check on AmazonB · Western Digital Blue SN5000 4TB
New · United States · USDAmazon Affiliate
Check on Amazon05 · 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
5500
5500
Sequential read (MB/s)
5000
5500
5500
Sequential write (MB/s)
3200
5000
5000
A · Silicon Power UD90 4TBB · Western Digital Blue SN5000 4TBEach row keeps the unit or category index named in its label; bar length compares A and B within that row.Western Digital Blue SN5000 4TB shows higher Value under every weighting we test — a stable result in the 2026-09-28 offer frame.
06 · 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 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 Blue SN5000 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
07 · 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 4TB | Western Digital Blue SN5000 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 | 5,000 MB/s | 5,500 MB/s✓ |
| Sequential write | 3,200 MB/s | 5,000 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 | $500snapshot 2026-09-28 | $470snapshot 2026-09-28✓ |
| 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.
08 · 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.
09 · 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 $250 cheaper · Value 100.
Neither of the two above is the only answer — this one clears the same bar for less. ⇄ Compare all three
10 · 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 4TB if…
- You can find it at or below its Strong Value threshold of $329 under balanced weights.
Choose B · Western Digital Blue SN5000 4TB if…
- You prioritize Heavy Creative Work — it earns the higher capability tier in those tracked scenarios.
- Your priorities resemble Balanced, System Drive, Game & File Storage — it has higher Relative Value under those presets at the snapshot offers.
- You can find it at or below its Strong Value threshold of $405 under balanced weights.
11 · 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 4TB or Western Digital Blue SN5000 4TB?
- Under the balanced preset and the 2026-09-28 offer frame, Western Digital Blue SN5000 4TB has higher Relative Value under this configuration (72 vs 60). 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 Blue SN5000 4TB grades higher in 1 of 3 graded scenarios (2 tied) and is never graded lower.
- At what price does the Silicon Power UD90 4TB become the better value?
- Holding the Western Digital Blue SN5000 4TB offer dated in the 2026-09-28 frame fixed, the calculation flips in favour of the Silicon Power UD90 4TB at roughly $382 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: 2026-09-28 · dataset generated 2026-09-29 · 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