# ADDLINK G55H 4TB at a glance: internals, speed, and limits (2026)

The ADDLINK G55H 4TB is a PCIe 5.0 x4 NVMe SSD built around the Phison E31T controller, targeting buyers who want Gen 5 sequential speeds without the premium of a full DRAM-equipped flagship.

Quick answer: The ADDLINK G55H 4TB makes a straightforward case for itself: PCIe 5.0 sequential speeds, a 5-year warranty with 2,400 TBW, and an integrated heatsink, at a price that undercuts most DRAM-equipped Gen 5 drives. It suits desktop builders who want the bragging rights of a 10,300 MB/s read SSD and have a motherboard with a PCIe 5.0 M.2 slot — and who are not running sustained write-heavy server-style workloads where dedicated DRAM cache would matter.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 5.0 |
| Controller | Phison E31T 4 Channel |
| Memory type | Kioxia 218-L TLC |
| DRAM cache | HMB |
| Sequential read | 10300 MB/s |
| Sequential write | 9000 MB/s |
| Random read IOPS | 1000000 |
| Random write IOPS | 1000000 |
| Endurance | 2400 TBW |
| MTBF | 1500000 |
| Warranty | 5 years |

## Performance

The ADDLINK G55H 4TB is rated at 10,300 MB/s sequential read and 9,000 MB/s sequential write, achieved over a PCIe 5.0 x4 NVMe interface. These figures are consistent with what Phison specifies for the E31T at its 4 TB configuration, where the additional NAND channels per package improve write parallelism over the 1 TB and 2 TB SKUs.

Because the G55H uses HMB rather than a dedicated on-board DRAM chip, the drive borrows a small region of system RAM to cache the NAND address map. In day-to-day workloads — OS boots, application launches, moderate file transfers — this difference from a DRAM-equipped drive is largely imperceptible. The gap becomes more apparent during sustained sequential writes that exhaust the SLC write cache, or in heavy random-write queues where a dedicated DRAM buffer would provide lower latency. Expect the 4 TB model to handle the SLC-to-TLC folding better than smaller capacities simply because it has more raw NAND to spread writes across.

The bundled heatsink keeps the controller at reasonable temperatures during extended workloads; the E31T has been measured at roughly 4–6 W under load, which is notably lower than the 8–12 W range typical of the E26-based drives. In a case with decent airflow the heatsink is sufficient; in an enclosed chassis or near warm components, seating the drive in a motherboard slot with its own heatsink remains an option since the G55H heatsink is removable.

## Endurance, TBW & Warranty

ADDLINK backs the G55H with a 5-year warranty, valid until the drive's percentage-used counter reaches its limit — readable via CrystalDiskInfo or any S.M.A.R.T. monitoring tool. The 4 TB model is rated for 2,400 TBW (terabytes written), derived from ADDLINK's published formula of 600 TBW per 1 TB of capacity across the lineup.

To put 2,400 TBW in context: a desktop user writing 50 GB per day would exhaust the endurance rating in roughly 131 years. A content creator writing 200 GB per day — large video files, scratch disk usage — would cross that threshold in about 33 years. Even aggressive daily workloads rarely approach endurance limits within the warranty period on a 4 TB drive; for most buyers, the 5-year coverage window is the practical constraint, not the TBW figure. MTBF is rated at 1,500,000 hours, consistent with mainstream consumer NVMe drives.

## Pros and Cons

**Pros:**

- 10,300 MB/s sequential read over PCIe 5.0 x4
- 9,000 MB/s sequential write — highest in E31T lineup
- 2,400 TBW endurance at 4 TB capacity
- 5-year manufacturer warranty
- Bundled aluminum heatsink included (8.75 mm)
- PS5 compatible (M.2 2280, exceeds 5,500 MB/s minimum)
- Lower power draw than DRAM-equipped Gen 5 drives (~4–6 W)
**Cons:**

- HMB, not DRAM — sustained random I/O lags behind DRAM-equipped peers
- PCIe 5.0 slot required for full speed; only ~7,000 MB/s in Gen 4 slots
- 4-channel E31T controller has a lower performance ceiling than 8-channel E26 drives
- 2-year warranty listed on some retailer pages — verify 5-year coverage at point of purchase
- Heatsink adds 8.75 mm height, may conflict with M.2 slot clearance on some boards


## Verdict

The ADDLINK G55H 4TB makes a straightforward case for itself: PCIe 5.0 sequential speeds, a 5-year warranty with 2,400 TBW, and an integrated heatsink, at a price that undercuts most DRAM-equipped Gen 5 drives. It suits desktop builders who want the bragging rights of a 10,300 MB/s read SSD and have a motherboard with a PCIe 5.0 M.2 slot — and who are not running sustained write-heavy server-style workloads where dedicated DRAM cache would matter.

Skip it if your workload involves continuous large-file writes for hours at a stretch, or if your platform only supports PCIe 4.0 — in that case a DRAM-equipped PCIe 4.0 drive like the WD Black SN850X delivers better sustained random performance at a similar price. For mainstream desktops and PS5 storage expansion, the G55H 4TB is a well-rounded choice at its capacity tier.

## Frequently Asked Questions

### What controller does the ADDLINK G55H 4TB use?

The G55H uses the Phison PS5031-E31T, a 4-channel PCIe 5.0 NVMe controller manufactured on TSMC's 7nm process. It is a DRAMless design that uses Host Memory Buffer (HMB) instead of a dedicated DRAM chip. This is not the same as the higher-end Phison E26 or E28, which are 8-channel designs with broader DRAM support and higher peak throughput — the E31T is positioned as a cost-efficient mainstream PCIe 5.0 option.

### What is HMB and does it affect performance?

Host Memory Buffer (HMB) is a feature defined in the NVMe specification that lets a DRAMless SSD borrow a small allocation of system RAM — typically 64 MB — to store the logical-to-physical NAND address map. This reduces production cost compared to soldering DRAM chips onto the drive PCB. The practical effect is minimal for sequential transfers and burst random reads, but under sustained queued random writes HMB drives can show higher latency than drives with dedicated on-board DRAM caches. Most desktop workloads do not expose this difference.

### Is the ADDLINK G55H compatible with the PlayStation 5?

Yes. The G55H uses the M.2 2280 form factor and delivers sequential reads well above the PS5's 5,500 MB/s minimum speed requirement. The included heatsink is 8.75 mm tall, which fits within the PS5's M.2 expansion bay clearance. ADDLINK explicitly lists PS5 compatibility on the product page.

### How many TBW does the ADDLINK G55H 4TB have?

The 4 TB G55H is rated for 2,400 TBW (terabytes written). ADDLINK applies a consistent formula of 600 TBW per 1 TB of capacity across the G55H lineup, so the 1 TB model is rated at 600 TBW and the 2 TB at 1,200 TBW. At a write rate of 100 GB per day, the 4 TB model's endurance would last approximately 65 years — the 5-year warranty is the practical limit for almost every buyer.

### What warranty does the ADDLINK G55H 4TB come with?

ADDLINK provides a 5-year limited warranty on the G55H series. The warranty period begins from the date of purchase and is also subject to the drive's percentage-used endurance counter — readable via CrystalDiskInfo using S.M.A.R.T. data. Some third-party retailer listings may incorrectly show a shorter warranty; always verify coverage against the official ADDLINK product page.

### Will the ADDLINK G55H work in a PCIe 4.0 motherboard?

Yes, the G55H is backward compatible with PCIe 4.0 and PCIe 3.0 M.2 slots. However, the drive's peak sequential speeds of 10,300 MB/s read and 9,000 MB/s write require a PCIe 5.0 x4 slot. In a Gen 4 slot the throughput caps at approximately 7,000 MB/s, which is still competitive with the top PCIe 4.0 drives. If your platform only has Gen 4 support, a purpose-built PCIe 4.0 SSD with DRAM may offer better value.

### How does the ADDLINK G55H 4TB compare to the Corsair MP700 Elite?

Both drives use the Phison E31T controller and Kioxia TLC NAND, so sequential performance is nearly identical. The primary difference is that the Corsair MP700 Elite pairs the E31T with a dedicated DRAM cache, which improves sustained random I/O consistency. The G55H typically costs less and includes a heatsink by default. For workloads dominated by sequential transfers — video editing scratch, game storage, large file copies — the performance gap is negligible. For workloads with heavy sustained random writes, the MP700 Elite's DRAM advantage may be worth the price premium.

### What NAND does the ADDLINK G55H 4TB use?

The G55H uses Kioxia 218-layer 3D TLC NAND, also identified as BiCS8. This is among the most advanced NAND nodes available in consumer SSDs as of 2024, offering a good balance of density, write endurance, and read latency. TLC (Triple-Level Cell) stores 3 bits per cell; the drive uses an SLC write cache to accelerate burst writes before folding data back to native TLC density.

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Last updated: 2026-08-17. Source: https://ssdrive.net/addlink-g55h-4-tb