Samsung 9100 PRO vs SanDisk Optimus GX PRO 8100

Buy the Samsung 9100 PRO if the two drives cost about the same and you want Samsung Magician, broad retail familiarity, or a matching Samsung storage setup. Buy the SanDisk Optimus GX PRO 8100—the renamed WD_BLACK SN8100—if it is meaningfully cheaper or its lower listed active power suits your build.

The specification sheets do not produce a clear performance winner. At 4TB, SanDisk lists slightly higher peak sequential speeds and random-read IOPS; Samsung lists higher random-write IOPS. Both use TLC NAND, DRAM, PCIe 5.0 x4, NVMe 2.0, a five-year limited warranty, and a 2,400TBW endurance rating.

Most gaming and everyday PC buyers should skip both and buy a mature PCIe 4.0 drive. These flagships make sense when you regularly move very large files, use storage-heavy creator or development workloads, and have a properly cooled Gen5 M.2 slot.

This is a research-based comparison. SolderMag has not benchmarked these drives side by side, so we are not declaring a real-world speed, thermal, latency, or sustained-write winner. The figures below come from the manufacturers' current data sheets, which use different test platforms and should not be treated as one controlled benchmark.

Quick verdict

There is no good reason to pay a large premium for either drive over the other. At 4TB, their rated endurance and warranty length match, their peak specifications overlap, and both provide first-party management software.

The Samsung 9100 PRO is the safer default at a price tie. Samsung Magician gives it a familiar firmware, health, security, and migration tool, and the 9100 PRO name is less likely to be confused with an older or renamed listing.

The Optimus GX PRO 8100 is the value pick when discounted. SanDisk rates its 4TB model for up to 14,900MB/s sequential reads and 14,000MB/s writes, with lower average active-power figures than Samsung lists for the 4TB 9100 PRO. Those are useful paper advantages, not proof that it will run faster or cooler in your exact PC.

If this drive is mainly for Windows, games, and applications, buy a less expensive Gen4 model instead. Our best 4TB NVMe SSD guide explains why the Samsung 990 PRO, WD Black SN850X, and value-focused alternatives remain sensible for most builds.

Samsung 9100 PRO vs Optimus GX PRO 8100 specifications

The table compares the 4TB, non-heatsink retail models linked in this guide. Confirm the capacity, heatsink, seller, and model number before ordering.

Rated speeds are "up to" figures. The manufacturers used different CPUs, motherboards, operating systems, and test tools in their published conditions. The sensible conclusion is that both sit in the top Gen5 performance class—not that a small number in this table predicts the winner in your workload.

The Optimus GX PRO 8100 is the WD_BLACK SN8100 under a new name

SanDisk began moving the WD_BLACK SSD portfolio to the Optimus name on 5 January 2026. The company says the WD_BLACK SN8100 is now branded SanDisk Optimus GX PRO 8100, with updated packaging and branding but unchanged performance.

That creates a practical buying trap. Retail pages, reviews, firmware discussions, and remaining stock may use either name. An SN8100 result is not automatically an obsolete or different controller, but you still need to confirm the capacity, heatsink configuration, model number, seller, and warranty region.

For the 4TB non-heatsink SanDisk model in this guide, look for model SDSP82400TAN. Do not assume every listing containing "8100" is the same product; SanDisk also sells other Optimus tiers with similar numbering.

Which SSD is faster?

On the specification sheets, the answer changes with the test:

• SanDisk lists a 100MB/s sequential-read advantage and a 600MB/s sequential-write advantage at 4TB.
• SanDisk lists up to 2.3 million random-read IOPS, compared with Samsung's 2.2 million.
• Samsung lists up to 2.6 million random-write IOPS, compared with SanDisk's 2.4 million.

These gaps are too small and too test-dependent to settle the buying decision. Peak sequential speed describes ideal large transfers, while random IOPS figures depend heavily on queue depth, thread count, test span, drive state, firmware, and platform.

Game loading, app launches, Windows updates, code builds, scratch work, and long writes stress storage differently. We would not buy one drive over the other for a few percentage points of vendor-rated speed.

The useful question is whether you can feed a Gen5 SSD at all. A PCIe 4.0 slot caps both drives below their headline bandwidth. Sharing chipset lanes, filling the drive, exhausting its dynamic cache, or letting the controller overheat can also matter more than the difference between 14,800 and 14,900MB/s.

Cooling and platform fit matter more than the paper winner

Both drives need a PCIe 5.0 x4 M.2 slot to reach their advertised class of performance. They can operate in older compatible slots, but buying a premium Gen5 drive for a Gen4-only system wastes much of the reason to own it.

Use a motherboard heatsink or buy the correct heatsink version if your board does not include one. Check clearances around the GPU and CPU cooler. A tall retail heatsink can conflict with a motherboard cover, while a bare drive under a decorative plate needs the thermal pad to make proper contact.

Samsung lists 9.0W average active read power and 8.2W write power for the 4TB 9100 PRO. SanDisk lists 6.5W and 7.0W for its 4TB model. Those numbers suggest an efficiency advantage for SanDisk under each company's test, but they are not a matched thermal test. We have not verified controller temperature, throttling behaviour, idle power, or laptop battery impact.

For a laptop, check the service manual before buying. A high-capacity Gen5 drive may be double-sided, the bay may not provide adequate cooling, and the firmware may restrict Gen5 operation. A fast Gen4 drive is often the more predictable portable upgrade.

Software and security

Samsung Magician supports firmware updates, drive health checks, performance tools, secure erase, data migration, and security configuration for supported Samsung drives. It is the clearer reason to prefer the 9100 PRO when the hardware decision is otherwise tied.

SanDisk provides Dashboard software for Windows for drive information, firmware updates, health monitoring, and related management tasks. The current Optimus GX PRO sheet also lists TCG Opal 2.02 support.

Samsung lists AES 256-bit hardware encryption, TCG Opal 2.0, and IEEE 1667. Security support is only useful if your operating system, firmware, and deployment policy configure it correctly. Do not treat an encryption line in a data sheet as proof that a drive is encrypted out of the box.

Buyers using Linux, macOS, a NAS, or an appliance should check tool support before assuming either Windows-focused dashboard will cover their maintenance workflow.

Capacity: 2TB, 4TB, or 8TB?

Both families are available from 1TB through 8TB, but performance, endurance, power, NAND layout, and physical construction can vary by capacity.

Choose 2TB for a main PC where games, applications, and active projects fit comfortably. It usually offers a more sensible total cost and keeps more of the budget available for RAM, GPU, backups, or cooling. Start with our best 2TB NVMe SSDs before paying for flagship Gen5 bandwidth.

Choose 4TB when you want one large project and game drive, regularly handle large media or dataset transfers, and have a current desktop platform. This is the fairest capacity for comparing these two products because both are rated at 2,400TBW.

Choose 8TB only after checking drive thickness, cooling, workload value, backup cost, and the exact price gap to two smaller drives. One 8TB SSD is convenient, but it also concentrates more data in one device. Capacity never replaces a backup.

Do not mix specifications between capacities. Samsung's 1TB model, for example, carries lower sequential-write and endurance figures than its 4TB model. A retailer's family page can hide those differences behind one product title.

Is PCIe 5.0 worth paying for?

Gen5 is worth considering when:

• you move very large local video, scientific, model, or dataset files;
• your application can produce sustained storage traffic beyond a strong Gen4 drive;
• you copy between two storage devices fast enough to avoid another bottleneck;
• your workstation has a direct CPU-connected Gen5 slot and proper M.2 cooling;
• the premium does not displace more important RAM, GPU, backup, or network upgrades.

Gen5 is usually not worth paying for when:

• the drive is mainly a game library;
• you are upgrading a PS5;
• the system has only PCIe 4.0 M.2 slots;
• most files arrive over a 1GbE or 2.5GbE network;
• the drive will sit in a USB4 enclosure;
• you are choosing it for Windows boot time or general browsing.

A USB4 enclosure cannot expose the internal drive's full Gen5 bandwidth. Our USB4 NVMe enclosure guide is a better place to choose an external setup.

Who should buy the Samsung 9100 PRO?

Buy the Samsung if:

• it costs about the same as the exact SanDisk capacity;
• you already use Samsung Magician and want one management workflow;
• the stronger listed random-write figure matches your reason for buying, while accepting that it is not a controlled comparison;
• Samsung's stated encryption features matter to a properly configured deployment;
• you want the least confusing product name and retail trail.

The linked Amazon US product is the 4TB non-heatsink model, MZ-VAP4T0B/AM, ASIN B0DX2GJ1YR. Confirm that exact capacity and configuration at checkout.

Who should buy the SanDisk Optimus GX PRO 8100?

Buy the SanDisk if:

• it is meaningfully cheaper than the equivalent Samsung;
• the lower vendor-listed active-power figures suit your shortlist;
• you understand that Optimus GX PRO 8100 and WD_BLACK SN8100 are the same performance family under SanDisk's new branding;
• SanDisk's 0°C to 85°C listed operating range matters to your specification process;
• you are comfortable using SanDisk Dashboard on Windows.

The linked Amazon US product is the 4TB non-heatsink model, SDSP82400TAN, ASIN B0GHY9WB4F. Some older coverage calls the family WD_BLACK SN8100; verify the exact current model rather than buying from the name alone.

Who should skip both?

Skip both if:

• you want the best value for gaming or normal desktop use;
• your M.2 slot is limited to PCIe 4.0;
• the motherboard lacks suitable Gen5 cooling;
• you need a PS5 upgrade;
• your workload is mainly network-limited;
• you are buying an external drive for a USB4 enclosure;
• the price premium would prevent you from buying a separate backup.

For most buyers, the premium Gen4 choice is still between Samsung's 990 PRO and WD's SN850X. Read our Samsung 990 PRO vs WD Black SN850X comparison for that decision. The TEAMGROUP MP44 4TB review covers a less expensive high-capacity option and the important MP44-versus-MP44Q naming trap.

Alternatives to consider

Samsung 990 PRO: buy this mature Gen4 model when you want Samsung Magician, broad compatibility, and high-end performance without paying for unused Gen5 bandwidth.

WD Black SN850X: choose it for a gaming PC or PS5 when the exact heatsink configuration and current price make sense. It is also the older brand counterpart to SanDisk's current Optimus transition, but it is a different Gen4 product from the GX PRO 8100.

TEAMGROUP MP44: consider it for a large game or project library when it costs meaningfully less. Its DRAM-less design and component-disclosure caveat make it a different value proposition, not a direct flagship substitute.

A second backup drive: if the choice is between a faster primary SSD and a current independent backup, buy the backup. Our SSD failure-rates explainer explains why warranty and endurance figures do not remove failure risk.

Buying checklist

1. Confirm the motherboard or laptop has a PCIe 5.0 x4 M.2 2280 slot.
2. Check whether that slot shares lanes with the GPU, another M.2 slot, or SATA ports.
3. Choose the capacity before comparing performance figures.
4. Match the exact heatsink or non-heatsink configuration to the installation.
5. Verify the full model number and seller.
6. Compare the current price rather than a list-price claim.
7. Install the manufacturer's current firmware and management tool where supported.
8. Keep adequate free space and cooling for sustained work.
9. Back up important data independently.

FAQ

Is the SanDisk Optimus GX PRO 8100 the same as the WD Black SN8100?

Yes. SanDisk says the WD_BLACK SN8100 transitioned to the SanDisk Optimus GX PRO 8100 name from 5 January 2026, with updated branding and packaging but unchanged performance. Capacity, heatsink, model, seller, and warranty region still need checking.

Is the Samsung 9100 PRO faster than the Optimus GX PRO 8100?

Not conclusively. Samsung lists higher 4TB random-write IOPS, while SanDisk lists slightly higher sequential speeds and random-read IOPS. The manufacturers use different test systems, and SolderMag has not run a matched benchmark.

Do these PCIe 5.0 SSDs need a heatsink?

Plan on proper cooling. Use a compatible motherboard heatsink or the correct retail heatsink version, and check physical clearance. Cooling quality, airflow, workload, and ambient temperature affect whether a drive maintains peak performance.

Can I use either SSD in a PCIe 4.0 slot?

They are backward-compatible with suitable PCIe M.2 slots, but the older interface limits bandwidth. A less expensive premium Gen4 drive is usually a better purchase for a Gen4-only system.

Are these good PS5 SSDs?

They are poor-value choices for that job. PS5 storage uses a PCIe 4.0 interface and requires a compatible heatsink and physical fit. A proven Gen4 model is the sensible route.

Should I buy a 9100 PRO instead of a 990 PRO?

Choose the 9100 PRO only when your Gen5 desktop and workload can use the extra sequential bandwidth and the price premium is reasonable. For gaming and normal desktop work, the 990 PRO class is already fast enough.

Which 4TB drive has the better endurance rating?

Neither on the published figure. Both 4TB models are rated for 2,400TBW and carry five-year limited warranties, subject to each manufacturer's terms and whichever limit is reached first.

Final recommendation

Choose the Samsung 9100 PRO when prices are close. Its software and cleaner product identity make it the easier default, while the two drives are too close on paper to justify chasing a small peak-speed difference.

Choose the SanDisk Optimus GX PRO 8100 when it is meaningfully cheaper. The lower vendor-listed active-power figures and slightly higher peak sequential specifications are useful, but they are not enough to justify paying more without matched testing.

Skip both if this is mainly a gaming or everyday PC upgrade. A good Gen4 SSD plus a separate backup is the better use of money for most buyers.

Sources

• Samsung 9100 PRO data sheet, revision 2.0: https://download.semiconductor.samsung.com/resources/data-sheet/Samsung_NVMe_SSD_9100_PRO_Datasheet_Rev.2.0.pdf
• SanDisk Optimus GX PRO 8100 data sheet: https://documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-8100-internal-nvme-ssd.pdf
• SanDisk Optimus rebrand explanation: https://www.sandisk.com/en-se/product-portfolio/optimus-ssds
• SanDisk Optimus GX PRO 8100 product page: https://www.sandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-8100-internal-nvme-ssd.html
• Samsung Magician software information: https://semiconductor.samsung.com/consumer-storage/magician/
• Exact Amazon US Samsung 9100 PRO 4TB non-heatsink listing, model MZ-VAP4T0B/AM, ASIN B0DX2GJ1YR: https://www.amazon.com/dp/B0DX2GJ1YR?tag=soldermag-20
• Exact Amazon US SanDisk Optimus GX PRO 8100 4TB non-heatsink listing, model SDSP82400TAN, ASIN B0GHY9WB4F: https://www.amazon.com/dp/B0GHY9WB4F?tag=soldermag-20

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