Quick Answer

For SA builders on X870, choose TLC (Triple-Level Cell) over QLC (Quad-Level Cell) for a Gen 5 NVMe primary drive. TLC Gen 5 drives like the Crucial T705 1 TB (R1,200–R1,800 at Evetech) deliver 14,500/12,700 MB/s and maintain full speed throughout their warranty life. QLC Gen 5 drives are cheaper but drop to Gen 3 equivalent speeds (3,500 MB/s) after the SLC write cache is exhausted — typically during large game downloads or video editing workloads.

TLC vs QLC: The Key Differences

Metric TLC Gen 5 (T705) QLC Gen 5
Sequential read 14,500 MB/s 14,000 MB/s
Sustained sequential write 12,700 MB/s 3,000–4,000 MB/s (after SLC cache)
TBW (1 TB) 600 TBW 300–400 TBW
ZAR price (1 TB) at Evetech ~R1,200–R1,800 ~R800–R1,200
Best for Games + creation Light use, read-heavy

The TLC vs QLC distinction matters most when writing large amounts of data continuously — a 50 GB game download writes the data fast enough to exhaust a QLC drive's SLC cache (typically 20–40 GB), after which write speed drops dramatically. TLC drives maintain rated speed throughout.

X870 Platform and Gen 5 NVMe Compatibility

X870 boards (Ryzen 9000 series) include PCIe 5.0 on the primary GPU slot. For Gen 5 NVMe, X870 requires a board with a native PCIe 5.0 M.2 slot (check spec sheet) or a PCIe 5.0 adapter card. X870E boards more commonly include native Gen 5 M.2 slots; X870 boards vary.

TLC Gen 5 Options at Evetech

  • Crucial T705 1 TB: ~R1,200–R1,800, 14,500/12,700 MB/s, TLC, includes heatsink
  • Samsung 9100 Pro 1 TB (if available): next-gen TLC Gen 5, check Evetech stock
  • WD Black SN850X 1 TB (Gen 4 TLC): ~R900–R1,100 — if your X870 board lacks a Gen 5 M.2 slot, this is the value alternative

FAQ

Is QLC Gen 5 NVMe good enough for gaming on X870 in SA?

For gaming-only builds: yes, with caveats. Game launches and in-game texture streaming are mostly read operations, where QLC and TLC perform similarly. The problem is when games update (large writes) — a 50 GB patch write can exhaust a QLC drive's cache and slow the download for 10–20 minutes. TLC avoids this completely.

How many TBW does a gaming SA build write per year on a Gen 5 drive?

Typically 10–30 TB/year for a heavy gamer (game installs, patches, saves, OS activity). Even a modest 300 TBW QLC drive would last 10–30 years at this rate — TBW is rarely the practical limit. The sustained write speed difference is more relevant than endurance for SA gaming builds.

Does the X870 heatsink on the M.2 slot keep a Gen 5 TLC drive cool enough in SA?

Most premium X870 boards include an M.2 heatsink that holds Gen 5 TLC drives at 60–70°C under sustained loads. Ambient temperatures in SA (25–32°C summer) push temps 3–5°C higher than European test conditions — the heatsink is not optional for Gen 5 TLC on X870 in SA.

TIP

X870 build buying a Crucial T705, choose the heatsink-included SKU — it's typically only R100–R200 more expensive than the bare drive version and saves you the hassle of sourcing a compatible third-party M.2 heatsink for a Gen 5 drive running at 80°C without cooling.