# Silicon Power XS70 4TB Review — A High-Capacity Phison E18 Value Pick (2026)

The Silicon Power XS70 4 TB is the rare PCIe 4.0 drive that combines a flagship Phison E18 platform with 176-layer TLC NAND at a price per gigabyte that undercuts nearly every name-brand competitor in the 4 TB tier.

Quick answer: The Silicon Power XS70 4 TB is the right pick for a buyer who wants maximum PCIe 4.0 capacity at a minimum price and does not need the last few percent of performance or the warranty infrastructure of a tier-one brand. The Phison E18 and Micron 176-layer TLC combination is proven and reliable, and the 3,000 TBW endurance rating is more than sufficient for any consumer workload including video editing and large dataset processing. Buy it as a game library, media archive, or content-creation scratch disk where $/GB matters more than benchmark leadership. Skip it if endurance is your top priority — the Seagate FireCuda 530 offers 5,100 TBW at 4 TB with data recovery services — or if you want the absolute fastest E18 implementation, in which case the Kingston KC3000 and WD Black SN850X are better tuned. The XS70's value proposition is simple: flagship-tier hardware at a price that often dips below mid-range competitors.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 4.0 x 4 |
| Controller | Phison PS5018-E18 |
| Memory type | Micron 3D TLC |
| DRAM cache | Samsung DDR4 |
| Sequential read | 7300 MB/s |
| Sequential write | 6800 MB/s |
| Random read IOPS | 750000 |
| Random write IOPS | 1000000 |
| Endurance | 3000 TBW |
| MTBF | 1600000 |
| Warranty | 5 years |

## Performance

The Silicon Power XS70 4 TB is rated for 7,300 MB/s sequential reads and 6,800 MB/s sequential writes, with random performance of up to 750,000 IOPS reads and 1,000,000 IOPS writes. These are strong numbers that land in the upper tier of PCIe 4.0 drives, though the XS70 trails the fastest E18 implementations — the Seagate FireCuda 530 reaches 7,300/6,900 MB/s with higher IOPS, and the Kingston KC3000 4 TB hits 7,000/7,000 MB/s. The differences are academic in most consumer workloads: the XS70 loads games, transfers large video projects, and handles 4K media ingest at speeds indistinguishable from any other premium Gen4 drive.

The Phison E18's dynamic pSLC cache on the 4 TB variant is generously sized — with more NAND available for cache duty, the drive sustains full write speed for transfers well beyond what a 1 TB or 2 TB drive can manage before exhausting to direct-to-TLC mode. Once the cache fills, writes settle at approximately 1,500 to 1,800 MB/s, consistent with other E18 implementations using Micron 176-layer NAND. Independent reviewers at Tom's Hardware rated the XS70 4.5 out of 5, praising its combination of flagship performance and aggressive pricing, though noting that the heatsink is more aesthetic than functional and that the drive trails the KC3000 and FireCuda 530 in some sustained-write and mixed-workload tests. For the PS5, the XS70 with the heatsink SKU fits the expansion bay and returns approximately 6,500 MB/s in the console's built-in speed test, safely above Sony's 5,500 MB/s minimum. The drive runs at typical E18 temperatures — mid-70s Celsius under sustained load without additional cooling, dropping to the 60s with a motherboard M.2 cover or the included heatsink.

## Endurance, TBW & Warranty

Silicon Power backs the XS70 4 TB with a 5-year limited warranty and an endurance rating of 3,000 TBW. At 3,000 TBW, the drive is rated to absorb roughly 1.6 TB of writes per day for the full warranty period — an endurance envelope that covers even demanding workstation use. At a typical consumer workload of 30 GB/day, the endurance stretches beyond 270 years, making write exhaustion functionally irrelevant. The TBW scales proportionally across the lineup: approximately 750 TBW for 1 TB, 1,500 TBW for 2 TB, and 3,000 TBW for 4 TB. The MTBF is rated at 1.6 million hours, a standard population statistic. Silicon Power is a smaller brand than Samsung or WD, and its warranty support infrastructure is less globally established — buyers who prioritize warranty service experience should factor this into the decision. The XS70 does not include hardware-based AES-256 encryption.

## Pros and Cons

**Pros:**

- 7,300 MB/s reads — flagship PCIe 4.0 throughput
- 4 TB capacity at aggressive sale pricing (often $200-215)
- Phison E18 + Micron 176L TLC is a proven, reliable platform
- 3,000 TBW endurance with 5-year warranty
- PS5 compatible with heatsink SKU
- Full channel saturation on 4 TB ensures peak sustained write performance
**Cons:**

- Trails other E18 drives (KC3000, FireCuda 530) in some sustained and random tests
- Included heatsink is more cosmetic than functional per multiple reviewers
- Silicon Power is a smaller brand — warranty support less proven than Samsung/WD/Crucial
- No AES 256-bit hardware encryption
- Power efficiency is average — not ideal for laptops under battery


## Verdict

The Silicon Power XS70 4 TB is the right pick for a buyer who wants maximum PCIe 4.0 capacity at a minimum price and does not need the last few percent of performance or the warranty infrastructure of a tier-one brand. The Phison E18 and Micron 176-layer TLC combination is proven and reliable, and the 3,000 TBW endurance rating is more than sufficient for any consumer workload including video editing and large dataset processing. Buy it as a game library, media archive, or content-creation scratch disk where $/GB matters more than benchmark leadership. Skip it if endurance is your top priority — the Seagate FireCuda 530 offers 5,100 TBW at 4 TB with data recovery services — or if you want the absolute fastest E18 implementation, in which case the Kingston KC3000 and WD Black SN850X are better tuned. The XS70's value proposition is simple: flagship-tier hardware at a price that often dips below mid-range competitors.

## Frequently Asked Questions

### Is the Silicon Power XS70 4TB good for gaming?

Yes, the XS70 4 TB is an excellent gaming drive, particularly for users with large game libraries. The 7,300 MB/s read speed loads titles within a fraction of a second of the fastest PCIe 4.0 drives, and the 4 TB capacity can hold dozens of modern AAA titles without resorting to external storage. The Phison E18 controller handles mixed read/write workloads well, meaning background game updates or installations do not cause stuttering during gameplay.

### Is the Silicon Power XS70 compatible with the PS5?

Yes, the XS70 with the included heatsink SKU is PS5-compatible. The rated 7,300 MB/s sequential read speed exceeds Sony's 5,500 MB/s minimum, and independent testing measured approximately 6,500 MB/s in the PS5's built-in speed test. The heatsink version fits within the PS5 expansion bay's 110 x 25 x 11.25 mm dimensions. If you have the bare-drive version, an aftermarket heatsink is required for PS5 installation.

### Does the Silicon Power XS70 have a DRAM cache?

Yes, the XS70 includes DDR4 DRAM cache across all capacities. The Phison E18 is a DRAM-based controller design that requires onboard DRAM to store the flash translation layer mapping table. The 4 TB variant uses a Samsung DDR4 DRAM package. This dedicated buffer ensures consistent random read and write performance under mixed workloads.

### What is the TBW endurance of the Silicon Power XS70 4TB?

The XS70 4 TB is rated for 3,000 TBW of endurance over its 5-year warranty period, equivalent to approximately 1.6 TB of writes per day. This is solid for a 4 TB Phison E18 drive, though it trails the Seagate FireCuda 530's class-leading 5,100 TBW at the same capacity. The 1 TB variant carries approximately 750 TBW, and the 2 TB variant approximately 1,500 TBW.

### How does the XS70 compare to the Kingston KC3000?

Both drives use the same Phison E18 controller and Micron 176-layer TLC NAND foundation, but Kingston's firmware tuning generally extracts slightly better performance — the KC3000 4 TB hits 7,000/7,000 MB/s sequential versus the XS70's 7,300/6,800 MB/s, and Kingston's random IOPS are higher. The KC3000 also carries higher endurance at 3,200 TBW for 4 TB. However, the XS70 typically sells for less money, especially on sale, making it the better value if raw price-per-gigabyte is the deciding factor.

### Does the Silicon Power XS70 need a heatsink?

For desktop use with a motherboard M.2 cover or moderate airflow, the XS70 runs within safe temperatures without a dedicated heatsink — the Phison E18 throttles at approximately 84 degrees Celsius, and the drive typically stays in the mid-70s under sustained load. For PS5 installation, a heatsink is required and the heatsink SKU or a compatible third-party cooler should be used. The included heatsink provides modest cooling improvement but is not a high-performance thermal solution.

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Last updated: 2026-05-17. Source: https://ssdrive.net/silicon-power-xs70-4-tb