KIOXIA Exceria 1TB PCIe 5.0 vs KIOXIA BG4 1TB M.2 2230: Spec Comparison
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You are comparing the kioxia exceria g3 1tb nvme SSD vs SSD 1tb bg4 m 2. Both drives offer 1TB of storage capacity from KIOXIA. The main difference lies in their generation and physical size. The Exceria G3 uses the newer PCIe 5.0 interface and a standard M.2 2280 shape. The BG4 relies on PCIe Gen3 and fits into the compact M.2 2230 slot. This affects where you can install them.
Key differences
| Aspect | KIOXIA Exceria 1TB PCIe 5.0 SSD | KIOXIA BG4 1TB M.2 2230 SSD |
|---|---|---|
| Interface | PCIe 5.0 Gen5 x4 | PCIe Gen3 x4 |
| Form Factor | M.2 2280 | M.2 2230 |
| NAND Type | BiCS Flash 3D QLC | not listed |
| Max Read Speed | not listed | 2300 MB/s |
| Max Write Speed | not listed | 1800 MB/s |
| Random Read IOPS | 1,600,000 | 390,000 |
Which one should you choose?
Choose KIOXIA Exceria 1TB PCIe 5.0 SSD if
- You need a drive for a modern desktop or gaming PC with a PCIe 5.0 slot.
- You want higher random read performance for system responsiveness.
- You require the standard M.2 2280 size for easy installation.
Choose KIOXIA BG4 1TB M.2 2230 SSD if
- You are upgrading a compact laptop, ultrabook, or handheld like a Steam Deck.
- Your motherboard only supports M.2 2230 slots.
- You need a single-sided drive for better heat management in tight spaces.
Verdict: Choose the Exceria G3 if you have a modern desktop system and want the fastest possible interface and random access speeds. Pick the BG4 if you are working with small form factor devices like laptops or handheld consoles that only accept the shorter 2230 size.
Exceria G3 vs BG4 Spec Breakdown
Interface Generation
The Exceria G3 utilizes PCIe 5.0 Gen5 x4, a significantly newer standard than the BG4’s PCIe Gen3 x4. This difference matters for bandwidth potential. PCIe 5.0 offers double the raw throughput of Gen3, allowing for faster data movement between the drive and your system. The BG4 relies on the older Gen3 interface, which limits its maximum sequential speeds to 2300 MB/s read and 1800 MB/s write. While Gen3 is still capable for many tasks, the Exceria G3’s newer interface positions it for future-proofing and higher performance ceilings.
Form Factor Size
Physical dimensions dictate where you can install these drives. The Exceria G3 is an M.2 2280 drive, measuring 3.19 inches in length. This is the standard size for most desktop motherboards and newer laptops. The BG4 is an M.2 2230 drive, measuring only 1.18 inches long. This compact size is essential for devices like the Steam Deck, Surface tablets, and ultrabooks with limited space. If you are building a standard PC, the BG4 will not fit. If you are upgrading a handheld console, the Exceria G3 will be too large. Your device slot determines which one you can use.
NAND Type
The Exceria G3 uses BiCS Flash 3D QLC NAND. QLC (Quad-Level Cell) stores four bits per cell, offering higher storage density and lower cost per gigabyte, though it can have lower endurance than TLC. The BG4’s NAND type is not listed in the provided specifications. Without knowing the specific NAND technology in the BG4, we cannot compare endurance or density directly. However, QLC is common in modern high-capacity drives like the Exceria G3. You should check the BG4’s full datasheet if NAND endurance is a critical factor for your workload.
Random IOPS
Random IOPS measure how fast the drive handles small, scattered files, impacting system responsiveness and game load times. The Exceria G3 offers up to 1,600,000 random read IOPS and 1,450,000 random write IOPS. The BG4 provides up to 390,000 random read IOPS and 200,000 random write IOPS. The Exceria G3 significantly outperforms the BG4 in these metrics, often by a factor of four. For tasks involving many small files, such as running large games or professional workflows, the Exceria G3 will feel much snappier and more responsive.
Thermal Design
Heat management is crucial for sustained performance. The BG4 features a single-sided design, which the manufacturer notes helps with less heat and cooler operation. This is beneficial for compact devices with poor airflow. The Exceria G3’s thermal design details are not specified in the data. PCIe 5.0 drives often generate more heat than Gen3 drives due to higher power and speed. Without specific thermal data for the Exceria G3, it is hard to compare directly. However, the BG4’s single-sided layout is a clear advantage for heat dissipation in tight spaces.
Device Compatibility
Compatibility depends entirely on your hardware. The Exceria G3 is compatible with gaming systems and PCs that support PCIe 5.0 and M.2 2280 slots. The BG4 is compatible with all systems having an M.2 2230 slot, including Steam Deck, Surface Tablets, and ultrabooks. You cannot install the Exceria G3 in a Steam Deck, and you cannot install the BG4 in a standard desktop PC motherboard slot designed for 2280 drives. Choose the Exceria G3 for desktops and newer laptops. Choose the BG4 for handhelds and compact ultrabooks.
Choose your KIOXIA SSD by use case
Users needing PCIe 5.0 speed for gaming
The Exceria G3 supports PCIe 5.0 Gen5 x4. This interface provides higher bandwidth potential than Gen3. It delivers up to 1,600,000 IOPS random read speeds. These specs ensure fast load times for large gaming libraries. You benefit from the newer standard if your system supports it.
Owners of compact laptops or handhelds
The BG4 uses the M.2 2230 form factor. This 30mm length fits devices like Steam Deck and Ultrabooks. The Exceria G3 is M.2 2280, which is too large for these slots. If your device requires the smaller 2230 size, this is your only viable option.
Those prioritizing single-sided thermal efficiency
The BG4 is single-sided. This design helps with heat dissipation and cool operation. It is suitable for tight spaces in laptops and tablets. The Exceria G3 does not specify single-sided construction. If thermal management in a confined space is critical, the BG4 design is preferable.
The products compared
KIOXIA Exceria 1TB PCIe 5.0 SSD
Best for: Standard desktop gaming and media workloads
- Storage Capacity
- 1TB
- Interface
- PCIe 5.0 Gen5 x4
- Form Factor
- M.2 2280
- Compatibility
- Gaming
- Dimensions
- 5.91 × 5.91 × 7.87 inches
View on Amazon: KIOXIA Exceria 1TB PCIe 5.0 SSD Affiliate link
The Kioxia Exceria G3 1TB uses BiCS Flash 3D QLC NAND in a standard M.2 2280 form factor. It supports PCIe 5.0 Gen5 x4 interfaces for high-speed data transfer. Random read speeds reach 1,600,000 IOPS, while random write speeds hit 1,450,000 IOPS. This configuration suits users needing fast load times and system responsiveness for gaming or large media projects. It offers a compact storage solution for modern PCs.
Pros
- PCIe 5.0 Gen5 x4 interface for high bandwidth
- 1,600,000 IOPS random read speed
- 1,450,000 IOPS random write speed
- BiCS Flash 3D QLC NAND for high density
Cons
- QLC NAND may have lower endurance than TLC options
- M.2 2280 size is too large for small form factor builds like the BG4
- No DRAM cache mentioned in specifications
Good fit if
- You need a standard M.2 2280 drive for a desktop or laptop
- You prioritize sequential read/write speeds for gaming
- You want high random IOPS for system responsiveness
Skip if
- You are building a small form factor PC requiring M.2 2230
- You need maximum drive endurance for heavy write workloads
- You are using a motherboard that only supports PCIe 4.0
Verdict: Kioxia Exceria G3 1TB PCIe 5.0 delivers high random IOPS and PCIe 5.0 speeds for standard desktop builds. It fits gamers and creators who need fast load times in a standard M.2 2280 slot, but avoids it if you require smaller form factors or higher endurance NAND.
KIOXIA BG4 1TB M.2 2230 SSD
Best for: Steam Deck and ultrabook upgrades
- Storage Capacity
- 1TB
- Interface
- PCIe Gen3 x4
- Max Read Speed
- 2300 MB/s
- Max Write Speed
- 1800 MB/s
- Form Factor
- M.2 2230
- Compatibility
- Laptop, Desktop
View on Amazon: KIOXIA BG4 1TB M.2 2230 SSD Affiliate link
The Kioxia BG4 is a 1TB NVMe drive built for compact M.2 2230 slots. It offers sequential read speeds up to 2300 MB/s and write speeds up to 1800 MB/s on a PCIe Gen3 x4 interface. This single-sided design helps manage heat in tight spaces. It fits systems like Steam Deck and ultrabooks. You get reliable storage in a small footprint.
Pros
- Sequential read speeds reach 2300 MB/s
- Compact M.2 2230 form factor fits small devices
- Single-sided design reduces heat buildup
- Compatible with Steam Deck and ultrabooks
Cons
- Uses PCIe Gen3 interface instead of newer Gen4 or Gen5
- Limited to 1TB storage capacity
- Smaller physical size may limit compatibility with standard 2280 slots
Good fit if
- You need an SSD for a Steam Deck or similar handheld
- You are upgrading an ultrabook with a 2230 slot
- You require a single-sided drive for better thermal management
Skip if
- You need the highest possible PCIe Gen4 or Gen5 speeds
- Your device only supports the standard 2280 form factor
- You require more than 1TB of storage space
Verdict: The Kioxia BG4 1TB M.2 2230 SSD is a practical solution for users with compact devices like the Steam Deck. It delivers solid Gen3 speeds in a space-saving design, making it ideal for ultrabooks and handhelds where size matters more than raw bandwidth.
Specifications side by side
| Spec | KIOXIA Exceria 1TB PCIe 5.0 SSD | KIOXIA BG4 1TB M.2 2230 SSD |
|---|---|---|
| Storage Capacity | 1TB | 1TB |
| Interface | PCIe 5.0 Gen5 x4 | PCIe Gen3 x4 |
| Form Factor | M.2 2280 | not stated |
| Max Read Speed | not stated | 2300 MB/s |
| Max Write Speed | not stated | 1800 MB/s |
| Compatibility | Gaming | Laptop, Desktop |
| Dimensions | 5.91 × 5.91 × 7.87 inches | 1.18 × 0.86 × 0.1 inches |
| Size | 1 To | not stated |
| Model | EXCERIA G3 | KBG40ZNS1T02 |
Frequently asked questions
Can the KIOXIA Exceria G3 fit in a Steam Deck?
No, the Exceria G3 is not suitable for a Steam Deck. It uses the standard M.2 2280 form factor, measuring 3.19 inches in length. The Steam Deck requires the smaller M.2 2230 size. You should choose the KIOXIA BG4 instead, as it is specifically designed for compact handheld devices and ultrabooks where space is limited.
Is the KIOXIA BG4 compatible with standard desktop motherboards?
Yes, the BG4 works in standard desktops, but you need an adapter. The drive uses the M.2 2230 form factor, which is shorter than the common 2280 slot. You will need an M.2 2230 to 2280 adapter bracket to install it in a standard desktop motherboard slot. It supports PCIe 3.0 x4 for basic connectivity.
Which drive offers better random read performance?
The KIOXIA Exceria G3 offers superior random read performance. It delivers up to 1,600,000 IOPS for random reads. This high speed supports fast load times for gaming and media workloads. The BG4 focuses on compact size rather than raw bandwidth, making the Exceria G3 the better choice for performance-intensive tasks on a desktop.
What is the physical size difference between the two drives?
The Exceria G3 is significantly larger than the BG4. The Exceria measures 3.19 inches long, 0.87 inches wide, and 0.09 inches thick. The BG4 is much more compact, measuring only 1.18 inches long, 0.86 inches wide, and 0.1 inches thick. This size difference determines which devices can physically accept each drive.
Does the Exceria G3 support PCIe 3.0 slots?
The Exceria G3 is designed for PCIe 5.0 interfaces. While it may work in older slots, it is optimized for the newer Gen5 x4 standard to achieve its full potential. If your system only supports PCIe 3.0, the BG4 is the more appropriate choice. It natively supports PCIe 3.0 x4, ensuring full compatibility with older hardware.
Which SSD is better for an ultrabook upgrade?
The KIOXIA BG4 is the better option for ultrabook upgrades. Ultrabooks often have limited space, requiring the M.2 2230 form factor. The BG4 fits this compact requirement while providing 1TB of storage. The Exceria G3 is too large for most ultrabooks and is intended for standard desktop builds where space is not a constraint.