QLC vs TLC NAND: What Difference Does It Make?

What are QLC and TLC NAND?

NAND flash memory is the storage technology inside solid-state drives (SSDs). The terms QLC and TLC refer to how many bits of data each memory cell can hold. TLC, or triple-level cell, stores 3 bits per cell. QLC, or quad-level cell, stores 4 bits per cell.

The more bits per cell, the more data can be packed into the same physical space. That is why QLC drives can offer larger capacities at a lower cost per gigabyte. However, the trade-off is that writing to cells with more bits is generally slower and wears them out faster. This article explains what that means for an editing laptop.

Speed and Endurance Differences

In simple terms, TLC NAND tends to offer faster write speeds and better endurance than QLC. Endurance refers to how many times data can be written to the drive before it wears out. Video editing involves writing large files, such as footage imports, project files, and render exports, so endurance matters for the main drive.

QLC drives can still be fast for reading data, which is what happens when you open a project or play back a timeline. But sustained writes, like exporting a long video, may slow down. TLC is generally more consistent under heavy write loads.

For a video editor, the difference is most noticeable when moving large amounts of footage or exporting final videos. TLC is often the safer choice for the drive that holds your operating system, editing software, and active projects.

Cost and Capacity Considerations

QLC NAND allows manufacturers to offer higher capacities at a lower price. For example, a 2TB QLC drive may cost less than a 2TB TLC drive. This can be attractive if you need a lot of storage for footage archives.

However, the cost difference is not the only factor. For an editing laptop, the main drive should prioritize performance and endurance. A QLC drive can be a good choice for a secondary drive used to store completed projects or less frequently accessed footage.

When comparing listings, look at the storage type if it is stated. Many listings simply say 'SSD' without specifying NAND type. If the type is not stated, you can check the maker's page for the model line, but often it is not disclosed. In that case, rely on the brand's reputation and the drive's stated capacity and warranty.

What to Read on a Laptop Listing

When reading a laptop listing, the storage section usually states the capacity, such as 1TB or 2TB, and the type, such as 'SSD' or 'NVMe SSD'. The NAND type (QLC or TLC) is rarely mentioned in the title or bullet points.

If the type is not stated, you can look for other clues. For example, a listing that emphasizes 'high endurance' or 'professional grade' may be more likely to use TLC, but this is not guaranteed. The most reliable way is to check the laptop maker's official page for the specific model, though even there the NAND type may not be listed.

For an editing laptop, the storage capacity and speed are more important than the NAND type alone. A 1TB TLC drive is generally better for editing than a 2TB QLC drive if you are working with large 4K projects, because the TLC drive will handle sustained writes better. For more on storage, see the storage types guide and the storage capacity guide.

How This Affects Your Choice

For video editing, the main drive should be fast and reliable. TLC NAND is the safer choice for the primary drive because it handles heavy write workloads better. If you need extra storage for footage, a QLC drive can be a cost-effective secondary option.

Consider the size of your projects. If you edit 4K footage, you will be writing large files regularly. A TLC drive will maintain consistent performance over time. If you mostly edit short clips and do not export frequently, QLC might be acceptable, but TLC is still recommended.

When comparing laptops, look at the storage capacity and whether it is an SSD. The NAND type is a detail that is often not stated, so focus on what you can verify: capacity, interface (like NVMe), and the brand's reputation. For more on storage, see the storage types guide and the storage capacity guide.

What to Pick for Your Situation

The table below summarizes what to look for based on your editing needs. Remember that the NAND type is not always stated, so use the capacity and the laptop's overall specs as your primary guide.

If you are choosing between two laptops with the same capacity and price, and one is known to use TLC (for example, from the maker's page), that is the better choice for editing. If the type is unknown, prioritize a laptop with a reputable SSD and enough capacity for your projects. For more guidance, see the best video editing laptop guide and the best laptop for 4K video editing guide.

What to pick for your situation

Questions

Is QLC NAND bad for video editing?

QLC is not inherently bad, but it has lower endurance and slower write speeds compared to TLC. For heavy video editing, TLC is preferred for the main drive. QLC can work for secondary storage or lighter workloads.

How can you tell if a laptop has QLC or TLC NAND?

The NAND type is rarely stated in laptop listings. You can check the maker's official page for the model, but it may not be disclosed. If not stated, focus on the SSD's capacity and the laptop's overall reputation.

Does QLC affect battery life?

Battery life is not directly affected by NAND type. It depends on the laptop's power management and components. The SSD's power draw is minimal compared to the display and processor.

Can you upgrade the SSD later to a TLC drive?

Many laptops allow SSD upgrades, but some have soldered storage. Check the laptop's specifications for upgradeability. If you plan to upgrade, ensure the laptop has an accessible M.2 slot.

Is TLC always faster than QLC?

In general, TLC offers faster sustained write speeds than QLC. However, real-world performance depends on the SSD controller and cache. Some high-end QLC drives can be fast for reads, but TLC is more consistent for writes.

What is the difference between QLC and TLC in terms of lifespan?

TLC has higher endurance, meaning it can handle more write cycles before failing. For video editing, where you write large files, TLC is more durable over time.