# Fanxiang S770 2TB Review — Full-Speed PCIe 4.0 NVMe with DRAM (2026)

The 2 TB Fanxiang S770 is the sweet spot of the lineup — it gets the full 6,800 MB/s write speed, double the DRAM, and the best endurance rating, but the same quality-control caveats follow it up the stack.

Quick answer: Buy the Fanxiang S770 2 TB if you want the most performance per dollar in a PCIe 4.0 drive and you are comfortable treating it as a fast-but-disposable component — a game library drive, a scratch disk, or bulk storage where nothing on it is irreplaceable. It is not the right drive for your only boot drive with no backup strategy, and it is a poor fit if you expect a smooth warranty experience. The Silicon Power US75 or Lexar NM790 at 2 TB cost slightly more but come from companies with functioning support departments, and for most buyers that premium is worth paying.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 2 TB |
| Interface | M.2 4.0 x 4 |
| Controller | Innogrit IG5236 |
| Memory type | YMTC 128-l TLC |
| DRAM cache | Yes |
| Sequential read | 7300 MB/s |
| Sequential write | 6800 MB/s |
| Random read IOPS | 860000 |
| Random write IOPS | 675000 |
| Endurance | 1400 TBW |
| MTBF | 2000000 |
| Warranty | 5 years |

## Performance

Rated sequential throughput is 7,300 MB/s reads and 6,800 MB/s writes over PCIe 4.0 x4, with random IOPS in the range of 860,000 reads and 675,000 writes. Those figures place the S770 2 TB among the faster PCIe 4.0 drives on the market, competitive with first-wave flagships that cost significantly more at launch. The 2 GB DRAM buffer gives the IG5236 controller room to handle larger mapping tables without hammering the NAND, which helps random I/O consistency under mixed workloads.

The drive uses a dynamic pseudo-SLC write cache to reach its rated speeds. Independent testing on the 1 TB variant showed a cache of roughly 340 GB; the 2 TB model should offer a proportionally larger cache, likely in the 600–700 GB range. Once the cache fills, writes fall back to native TLC speed, which is a fraction of the peak rating. For gaming, OS boot, and general productivity this is a non-issue — the cache recovers quickly and the vast majority of consumer transfers land well inside the cache window. Only buyers moving multiple hundreds of gigabytes in a single session will notice the post-cache drop.

## Endurance, TBW & Warranty

Fanxiang covers the S770 2 TB with a 5-year warranty limited by 1,400 TBW of endurance. At a heavy consumer write rate of 50 GB per day, that endurance budget stretches to roughly 77 years — the warranty clock will run out decades before the NAND wears out under normal use. The 2 million hour MTBF rating is present but, as with all SSD MTBF figures, it describes failure rates across a large population of drives rather than predicting any individual unit's lifespan. The real warranty question is whether Fanxiang will actually honour a claim: multiple user reports across Amazon and forums describe support tickets going unanswered, with buyers ultimately relying on retailer return windows rather than manufacturer RMA.

## Pros and Cons

**Pros:**

- 7,300 MB/s reads and 6,800 MB/s writes — full-speed PCIe 4.0
- 2 GB DDR4 DRAM cache for consistent random I/O
- 1,400 TBW endurance rating on the 2 TB model
- Includes heatsink, thermal pads, screwdriver, and M.2 screw
- Strong value at current street pricing
**Cons:**

- Unannounced NAND and controller swaps between production batches
- Customer support repeatedly reported as unresponsive for warranty claims
- Double-sided PCB limits compatibility with some laptops and the PS5
- YMTC 128L NAND linked to data corruption in user forum reports


## Verdict

Buy the Fanxiang S770 2 TB if you want the most performance per dollar in a PCIe 4.0 drive and you are comfortable treating it as a fast-but-disposable component — a game library drive, a scratch disk, or bulk storage where nothing on it is irreplaceable. It is not the right drive for your only boot drive with no backup strategy, and it is a poor fit if you expect a smooth warranty experience. The Silicon Power US75 or Lexar NM790 at 2 TB cost slightly more but come from companies with functioning support departments, and for most buyers that premium is worth paying.

## Frequently Asked Questions

### Does the Fanxiang S770 2TB have a DRAM cache?

Yes, and the 2 TB model gets 2 GB of DDR4 DRAM — double what the 1 TB variant typically carries. The DRAM cache stores the logical-to-physical mapping table on the drive itself rather than borrowing system RAM via HMB, which improves sustained random I/O consistency and reduces latency under heavy mixed read/write workloads. For a budget-oriented drive, having a genuine DRAM cache at this capacity is one of the S770's strongest selling points.

### Is the Fanxiang S770 2TB good for gaming?

For gaming, the S770 2 TB is excellent on paper. Game load times, texture streaming, and DirectStorage workloads all benefit from the 7,300 MB/s sequential reads, and the 2 GB DRAM cache keeps random access snappy during mixed loads like background updates plus active gameplay. In real-world game load comparisons, the difference between this drive and a PCIe 5.0 flagship is typically under one second. The concern is not performance — it is longevity. If this is a secondary game library drive and your saves are cloud-backed, the value proposition is strong.

### What is the TBW endurance of the Fanxiang S770 2TB?

The 2 TB S770 is rated for 1,400 TBW. At a very heavy consumer write rate of 50 GB per day, that equates to roughly 77 years of writes before the NAND endurance budget is exhausted. The 5-year warranty will expire long before the TBW ceiling is reached. The 1 TB model carries 700 TBW, and the 4 TB model is estimated at roughly 2,800 TBW.

### Is the Fanxiang S770 compatible with the PS5?

It meets the core requirements — PCIe 4.0 x4, M.2 2280, and reads above Sony's 5,500 MB/s recommendation — but the double-sided PCB means total assembly height with a heatsink must be measured carefully against the PS5's 11.25 mm clearance limit. Users on Amazon report successful PS5 installations with measured reads around 6,540 MB/s. Use the included heatsink and verify fit before closing the bay cover.

### Does the Fanxiang S770 2TB need a heatsink?

Use the included heatsink. The IG5236 controller draws meaningful power under load and the double-sided PCB with YMTC NAND generates heat on both surfaces. In a desktop case with good airflow the bare drive may survive, but inside a PS5 or a cramped ITX build, the heatsink is the difference between sustained writes and thermal throttling. Fanxiang ships one in the box — there is no reason not to install it.

### How does the Fanxiang S770 compare to the Samsung 990 EVO?

The S770 2 TB uses a DRAM-backed IG5236 controller while the Samsung 990 EVO is a DRAM-less HMB design, which gives the S770 a theoretical edge in sustained mixed-I/O workloads. Samsung counters with far more consistent NAND sourcing, proven firmware, and a warranty process that actually works. In sequential throughput the two are close; in long-term predictability and support, Samsung wins by a wide margin. The S770 makes sense only if the price gap is large and you accept the support trade-off.

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Last updated: 2026-08-10. Source: https://ssdrive.net/fanxiang-s770-2-tb