WD Black SN7100 1TB NVMe Gen4

WD Blue SN7100 1TB - Gen4 With DRAM Cache at a Price That Makes Sense

The WD Blue SN7100 is WD's recent addition to the Gen4 mid-range, sitting above the SN770 with two meaningful upgrades: higher sequential speeds (7,250 MB/s vs 5,150 MB/s) and a dedicated DRAM cache. At ₹5,500–8,000 for 1TB, it closes the gap between mid-range and near-flagship Gen4 NVMe performance.

In India's competitive 1TB Gen4 NVMe market, this positions the SN7100 against the Lexar NM790, Samsung 990 EVO Plus, and the older SK Hynix P41 Platinum - all strong drives at similar price points. Here is where the SN7100 lands in that field.

What DRAM Cache Actually Changes

The SN770 is TLC DRAMless. The SN7100 is TLC with DRAM. This distinction matters more for workstation and creator use than pure gaming, but it is real.

A dedicated DRAM cache holds the entire NAND Flash Translation Layer (FTL) in fast memory. When the drive needs to translate a logical block address to a physical NAND location, it checks DRAM first - microseconds versus milliseconds if it had to check NAND. Under sustained random read/write workloads - large project folders, simultaneous game installs, database operations, VM workloads - DRAM-equipped drives maintain lower latency more consistently.

For gaming specifically, the difference between SN770 (DRAMless) and SN7100 (DRAM) is minimal - games are sequential workloads at the SSD level, and both drives handle those with ease. The DRAM advantage shows up in workstation scenarios: running multiple applications simultaneously, large file operations, working with many small files.

Interface:        PCIe Gen4 x4, NVMe 1.4
Sequential Read:  up to 7,250 MB/s
Sequential Write: up to 6,500 MB/s
Form Factor:      M.2 2280
NAND:             TLC
DRAM Cache:       Yes
Warranty:         5 years

SN7100 vs Competitors in India

vs Lexar NM790 1TB (₹4,500–6,500): The NM790 uses TLC NAND and is DRAMless (HMB). Sequential speeds are similar at 7,400 MB/s. It is cheaper. If you want maximum value and the DRAM cache is not a priority, the NM790 is a strong competitor. The SN7100 wins on DRAM cache and WD's 5-year warranty versus Lexar's 5-year warranty - both are solid, but WD India's service network is larger.

vs Samsung 990 EVO Plus 1TB: The 990 EVO Plus is Samsung's Gen4+Gen5 hybrid drive (Gen5 on 2 lanes) - it hits similar sequential speeds. Pricing in India often puts both drives in the same range. The SN7100 is purely Gen4 x4, which is the dominant standard right now. Either is an excellent choice; the decision comes down to brand preference and current pricing.

vs WD Black SN770 1TB: The SN7100 costs ₹500–1,500 more and adds DRAM cache and higher sequential speeds. If the gap is under ₹1,000 at your retailer, the SN7100 is the better buy. For a pure gaming build where the DRAM advantage is minimal, the SN770 is fine.

India Availability

As a recent launch, the SN7100 has built up good stock across Indian retailers. MDComputers, Vedant Computers, Amazon India, and Flipkart all stock it. PrimeABGB typically carries WD's full lineup. Check all five for current pricing - the competitive Gen4 1TB market means prices shift frequently, and you may find meaningful differences between platforms.

Who Should Buy This

Buy the WD Blue SN7100 1TB if you want a capable Gen4 NVMe with a DRAM cache and TLC NAND at a fair price. It is a strong all-rounder for an OS and gaming drive, and the DRAM cache makes it appropriate for creator workflows too.

Skip it in favour of the SN770 if it is more than ₹1,500 more expensive - the DRAM advantage for pure gaming does not justify a large price gap. Consider the WD SN5000 2TB if you need 2TB of fast storage rather than 1TB.