Cloudzat NAS SSD Buyer Guide
SANDISK NAS 800 vs WD Red SN700: NAS NVMe Comparison
NAS 800 is a newer PCIe 5.0 NAS NVMe family with capacities up to 7.68TB, while WD Red SN700 is an established NAS-oriented NVMe option.
Choose the exact model on your NAS compatibility list. NAS 800 favors newer high-performance all-flash systems; SN700 can remain attractive where it is already validated.
Quick answer
The short answer
NAS 800 is a newer PCIe 5.0 NAS NVMe family with capacities up to 7.68TB, while WD Red SN700 is an established NAS-oriented NVMe option.
What should you choose?
Choose the exact model on your NAS compatibility list. NAS 800 favors newer high-performance all-flash systems; SN700 can remain attractive where it is already validated.
Interactive calculator
NAS 800 vs WD Red SN700 Value Calculator
Enter the NAS interface, workload, RAID and daily writes that match your deployment. Results are planning estimates; your NAS vendor's compatibility list and firmware support remain the final authority for an exact model.
Live Amazon NAS SSD listings
Current NAS SSD Price Options
Compare current Amazon listings for the NAS SSD families relevant to this guide. SATA and NVMe products are kept separate, and exact model and capacity details are shown where available.
At-a-glance comparison
Use this table to compare the specifications that materially change the NAS buying decision.
| Feature | SANDISK NAS 800 | WD Red SN700 |
|---|---|---|
| Interface | PCIe 5.0 NVMe | PCIe 3.0 NVMe |
| Form factor | M.2 2280 | M.2 2280 |
| Largest NAS 800 capacity | 7.68TB | Capacity-dependent SN700 range |
| NAS 800 max endurance | 14,000 TBW | Capacity-dependent |
| Decision priority | New-platform performance/endurance | Established compatibility/value |
Who should choose NAS 800 and who should choose SN700
NAS 800 is aimed at newer NAS platforms that can exploit PCIe 5.0, very high endurance and capacities through 7.68TB. WD Red SN700 is an established PCIe 3.0 NAS NVMe family that may appear on more legacy compatibility lists. Choose the drive that the NAS actually supports and that meets the workload; a Gen5 label is not valuable when the host link is Gen3.
Compare current street price at the same capacity
Launch products and mature products can have very different discounts. Normalize the closest capacities, calculate cost per usable terabyte and include the number of M.2 slots required. A cheaper SN700 can be rational in an older NAS, while a higher-capacity NAS 800 may reduce slot count in a dense all-flash system. The Amazon table keeps the families separate so pricing remains readable.
Before you buy
Match the physical interface
A 2.5-inch SATA bay and an M.2 NVMe slot are not interchangeable. Confirm both the form factor and electrical interface.
Check vendor compatibility
NAS compatibility can vary by model, firmware and whether the slot is approved for cache, tiering or primary storage.
Size endurance
Estimate real daily writes and rebuild/scrub overhead rather than buying only on headline throughput.
Respect the network ceiling
A fast PCIe 5.0 SSD cannot make a 1GbE or 2.5GbE client link deliver NVMe-class network throughput.
PCIe 5.0 versus PCIe 3.0 is the obvious interface gap
NAS 800 is a PCIe 5.0 NVMe device, whereas WD Red SN700 uses PCIe 3.0. A modern Gen5 NAS can give Sandisk much more sequential headroom. In a Gen3 slot, the interface advantage largely disappears. Check the NAS lane generation and width before drawing conclusions from drive specifications.
NAS 800 offers a 7.68TB high-capacity option
The 7.68TB NAS 800 is useful for compact systems where each M.2 slot is valuable. SN700 availability and capacities vary by market and model, so compare the exact part number you can actually buy. Density can outweigh price per drive when the alternative requires more SSDs than the chassis can hold.
Endurance should be compared by exact capacity
Sandisk publishes up to 14,000 TBW for its 7.68TB model. WD endurance ratings differ across SN700 capacities. Avoid comparing the highest number from one family with a small-capacity model from the other. Translate each candidate’s TBW into expected years at the projected daily writes and RAID write factor.
Sequential speed is only one NAS workload metric
NAS 800’s peak figures are far above SN700, but sequential performance can be hidden behind 10GbE or slower networking. Random I/O, latency, queue depth and simultaneous clients may expose more of the NVMe advantage. For a simple backup target, both drives can be overqualified relative to the network. For VM storage, drive and host latency become much more important.
Mature compatibility can favor SN700
An older drive family has had more time to appear on Synology, QNAP, Asustor and other vendor lists, though qualification varies by specific model. NAS 800 is new in 2026, so support lists may expand after launch. If production support matters, an approved SN700 can be a safer purchase than a faster unlisted SSD.
Thermal behavior depends on both drive and enclosure
A PCIe 5.0 SSD can place more demand on M.2 cooling than a PCIe 3.0 device. The exact NAS airflow and controller workload determine temperatures. Review the vendor’s approved thermal solution and monitor sustained write behavior. Do not choose a thick aftermarket heatsink without checking chassis clearance.
Cache workloads do not always justify Gen5
If the M.2 slot is restricted to cache, the value of maximum sequential speed depends on the caching implementation and the underlying disks. A Gen3 SN700 may already be fast enough to remove the intended bottleneck. Gen5 is more persuasive when the NAS supports primary NVMe pools, heavy random workloads and enough PCIe bandwidth to keep the drive busy.
Serviceability can outweigh the performance delta
For a business NAS, replacement availability and predictable model numbers matter. A drive that is easy to source in the same capacity can simplify RAID maintenance. Keep a compatible spare for important arrays and document the exact SKU. Do not assume another capacity in the same family has identical endurance or performance specifications.
Avoid consumer NVMe substitutes in a price comparison
A broad marketplace search may show cheaper gaming SSDs with impressive speed. They are not automatically equivalent to NAS 800 or SN700 for continuous NAS use. Compare the two NAS families independently, then weigh endurance, support and workload intent before letting a lower consumer-SSD price drive the decision.
NAS 600 and SATA remain valid for older systems
If the NAS cannot create an NVMe storage pool or has only SATA bays, neither NAS 800 nor SN700 is the right primary-storage purchase. A NAS-class SATA SSD such as NAS 600 or WD Red SA500 can be more compatible and still saturate slower client networks. Start with the chassis architecture, then choose the SSD family.
Methodology and sources
This page is a specification, compatibility and buying analysis based on current manufacturer documentation and marketplace data, not hands-on testing. Always confirm the exact NAS compatibility list and firmware before purchase.
As an Amazon Associate, Cloudzat may earn from qualifying purchases. Marketplace listings are not compatibility guarantees. Confirm the exact model, capacity, interface, form factor, endurance, firmware support, seller and warranty source before purchase.
Frequently asked questions
Which interface does SANDISK NAS 800 use?
PCIe 5.0 NVMe in an M.2 2280 form factor.
Which interface does WD Red SN700 use?
WD Red SN700 is a PCIe 3.0 NVMe NAS SSD family.
Will NAS 800 be faster in a PCIe 3.0 NAS?
It will be constrained by the host link, so much of the Gen5 sequential advantage cannot be used.
Which family offers 7.68TB?
SANDISK NAS 800 includes a 7.68TB model.
Which is better for an older NAS?
The drive listed as supported for the exact NAS is usually the safer choice; SN700 may have broader legacy qualification.
Should I compare maximum TBW numbers directly?
Compare the same or closest capacity because endurance ratings scale with capacity.
Is Gen5 necessary for NAS cache?
Not always. Cache behavior, host PCIe lanes and the underlying storage determine whether Gen5 provides a meaningful benefit.
Can either drive be used as primary storage?
Only when the NAS firmware supports an NVMe storage pool for the specific drive/slot configuration.
Which is better for a 10GbE file server?
Either can exceed a single 10GbE sequential stream; workload concurrency, random I/O and compatibility may decide the better purchase.
Why keep the Amazon listings in separate groups?
It prevents a missing NAS 800 listing from being filled with an SN700 or unrelated NVMe product as though it were the same drive.