Technical Comparison for PCIe Gen4 NVMe Buyers
At first glance, the Crucial T500 and Crucial P310 look very similar. Both are PCIe 4.0 x4 NVMe SSDs in the M.2-2280 form factor, both support NVMe 1.4, and both deliver multi-gigabyte per second sequential performance.
However, the architectural differences under the hood explain why they are positioned differently.
1. NAND Architecture
Crucial T500
- 3D TLC NAND (3 bits per cell)
- Higher native write speed per cell
- Higher endurance rating
- Designed for performance and consistency
Crucial P310
- 3D QLC NAND (4 bits per cell)
- Higher storage density per die
- Lower cost per GB
- Lower native write speed per cell
The key difference is TLC vs QLC.
TLC stores 3 bits per cell, which allows faster programming and better endurance.
QLC stores 4 bits per cell, increasing density but reducing native performance and write lifespan.
For light workloads, the difference is small. Under sustained heavy writes, it becomes more noticeable.
2. DRAM vs HMB Design
T500: Dedicated DRAM Cache
The T500 includes onboard DRAM. This stores the Flash Translation Layer (FTL) mapping tables locally on the SSD.
Benefits:
- Lower latency
- Stronger random I/O performance
- More consistent behavior under load
- Better sustained write handling when the drive fills up
P310: DRAM-less with Host Memory Buffer (HMB)
The P310 does not include dedicated DRAM. Instead, it uses NVMe Host Memory Buffer, borrowing a small amount of system RAM.
Implications:
- Lower manufacturing cost
- Slightly higher latency than DRAM designs
- Good performance for general workloads
- Less consistent under heavy random operations
For gaming and everyday use, HMB works well. For heavy multitasking or workstation scenarios, DRAM still has an advantage.
3. Performance Specifications (Typical 1TB Models)
| Specification | Crucial T500 | Crucial P310 |
|---|---|---|
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 |
| NAND | TLC | QLC |
| DRAM | Yes | No (HMB) |
| Sequential Read | Up to ~7400 MB/s | Up to ~7100 MB/s |
| Sequential Write | Up to ~7000 MB/s | Up to ~6000 MB/s |
| Random Read IOPS | Higher | Slightly lower |
| Random Write IOPS | Higher | Slightly lower |
Sequential performance is close.
The larger difference appears in sustained writes and random workloads.
4. SLC Cache Behavior
Both drives use dynamic pseudo-SLC caching to boost write performance.
When writing small to medium bursts of data:
- Both drives feel extremely fast.
- Real-world difference is minimal.
When writing very large continuous files:
- The T500 maintains higher speeds after cache exhaustion.
- The P310 can drop more sharply once its SLC cache is full, due to QLC’s lower native write speed.
This is important for:
- Large 4K/8K video exports
- Continuous data capture
- Heavy content creation workflows
It is far less relevant for:
- Gaming
- Office tasks
- General consumer use
5. Endurance (TBW)
TLC generally provides higher total write endurance than QLC at the same capacity.
For typical consumer workloads:
- Both drives will last many years.
- Most users will never approach the TBW limit.
For write-intensive environments:
- The T500 is technically the safer long-term choice.
6. Latency and Consistency
Where the T500 differentiates itself is not peak speed but consistency:
- Lower latency due to DRAM
- Better queue depth scaling
- More stable performance under mixed workloads
- Less performance fluctuation when nearly full
The P310 focuses on delivering high Gen4 sequential performance at lower cost per GB, accepting trade-offs in sustained and heavy random performance.
So What’s the Point of This Comparison?
In everyday use, there is not a dramatic difference. Both are modern PCIe Gen4 SSDs that are significantly faster than older Gen3 or SATA drives.
The real distinction is architectural:
- T500 = Performance-oriented TLC + DRAM design
- P310 = Cost-efficient QLC + DRAM-less design
If the system is:
- A gaming PC
- A secondary storage drive
- A general office system
The P310 is often sufficient.
If the system is:
- A primary OS drive in a high-end build
- A workstation
- Handling heavy sustained writes
- Meant for longer endurance margin
The T500 is the technically stronger option.
Final Technical Summary
Both drives are fast.
Both fully utilize PCIe 4.0 bandwidth.
The difference is not peak speed, but architecture, endurance, and consistency under load.
For many buyers, price per TB will decide.
For performance-sensitive users, NAND type and DRAM still matter.