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Samsung 990 PRO vs SK Hynix Platinum P51: Comparison
What is the difference between Samsung 990 PRO and SK Hynix Platinum P51?
Sequential read is where these two genuinely part company, Samsung 990 PRO 7450 MB/s against SK Hynix Platinum P51 14700 MB/s, a 49% lead for SK Hynix Platinum P51. The benchmark result agrees. Speed Score puts SK Hynix Platinum P51 16% ahead, 10 against 8.4.
Which should you buy, Samsung 990 PRO or SK Hynix Platinum P51?
Take the Samsung 990 PRO for gen 4 systems that need strong random performance, not just headline sequential numbers. It also earns its place with PS5 expansion, where the single-sided 2280 layout and heatsink option fit Sony's rules exactly. It is not the one for sustained multi-hundred-gigabyte writes. The 226GB cache runs out and the SN850X holds nearly three times as much. Take the SK Hynix Platinum P51 for buyers who want flagship PCIe 5.0 performance from a brand with genuine in-house NAND manufacturing pedigree. SK Hynix's vertical integration is a real differentiator against brands that source flash from third parties. It is equally the pick for anyone comparing the current top three PCIe 5.0 drives on headline speed alone. This drive competes directly at that same tier. Avoid it for buyers who specifically want the most established brand track record in SSDs. Samsung and WD/SanDisk carry longer consumer SSD histories than SK Hynix's newer entry into this specific market segment. Our rating of the Samsung 990 PRO (8/10): still the best-engineered PCIe 4.0 drive. The 2026 price is the only reason to look elsewhere, and right now it is a good reason.
Read the full breakdown: What Changed on Consumercarts: September 2026
Frequently asked questions
Do the Samsung 990 PRO and SK Hynix Platinum P51 differ on bus interface?
Yes. Bus Interface reads PCIe 4.0 x4 on the Samsung 990 PRO versus PCIe 5.0 x4 on the SK Hynix Platinum P51.
Is the Form Factor the same on the Samsung 990 PRO and SK Hynix Platinum P51?
It is. Both are listed at M.2 2280, so it is not a reason to pick one over the other.
Specs and benchmarks
Speed Score
- Samsung 990 PRO
- 8.4/10-16%
- SK Hynix Platinum P51
- 10.0/10Best
How fast this drive is, rated from its read and write speeds, cache and NAND type. 10 is the fastest.
Brand
- Samsung 990 PRO
- Samsung
- SK Hynix Platinum P51
- Other
Model Number
- Samsung 990 PRO
- 990 PRO
- SK Hynix Platinum P51
- Platinum P51
Series
- Samsung 990 PRO
- 990 PRO
- SK Hynix Platinum P51
- SK Hynix Platinum P51
Bus Interface
- Samsung 990 PRO
- PCIe 4.0 x4
- SK Hynix Platinum P51
- PCIe 5.0 x4
Form Factor
- Samsung 990 PRO
- M.2 2280
- SK Hynix Platinum P51
- M.2 2280
Sequential Read
- Samsung 990 PRO
- 7450 MB/s-49%
- SK Hynix Platinum P51
- 14700 MB/s
Controller
- Samsung 990 PRO
- Samsung Elpis
- SK Hynix Platinum P51
- SK hynix Alistar ACNT093
DRAM Cache
- Samsung 990 PRO
- LPDDR4
- SK Hynix Platinum P51
- DRAM
NAND Type
- Samsung 990 PRO
- Samsung V-NAND TLC
- SK Hynix Platinum P51
- TLC
Warranty
- Samsung 990 PRO
- 5 Years
- SK Hynix Platinum P51
- 5 Years
Which one should you pick?
Choose Samsung 990 PRO if you already have it on hand or find it at a lower price.
Choose SK Hynix Platinum P51 if you want the higher speed score (10.0 vs 8.4) and the higher sequential read (14700 MB/s vs 7450 MB/s).
Price comparison
| Retailer | Samsung 990 PRO | SK Hynix Platinum P51 |
|---|---|---|
| Amazon | $385.27 View on Amazon | |
| B&H Photo | View on B&H Photo | |
| Best Buy | View on Best Buy | |
| Newegg | View on Newegg |
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Verdict
Samsung 990 PRO
8 / 10 Expert Rating
Still the best-engineered PCIe 4.0 drive.
More comparisons in SSDs
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- Samsung 990 PRO vs ADATA XPG Gammix S70 (PCIe 4.0 NVMe/7,400 MB/s Read/6,400 MB/s Write/Full-Size Gaming Flagship)