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Toshiba BG4 KBG40ZNT256G

KBG40ZNT256G

The Toshiba / Kioxia BG4 KBG40ZNT256G is a fast PCIe SSD in the small 2242 M.2 form factor.

TypeSSD
SizeM.2 2242
Capacity256 GB
InterfaceNVMe
Announced20.08.2020

Benchmarks

Performance Rating - DiskSpd
11.6 pt (13%)
Seagate ST1000LM014 Solid State Hybrid Drive
0.687 -94%
...
Crucial P2 1TB CT1000P2SSD8
9.79 -16%
SK hynix HFB1M8MQ331C0MR
10.1 -13%
Samsung SSD 860 Evo 256GB M.2
10.4 -10%
Foresee 512GB
10.9 -6%
Apple SSD SM0512F
10.9 -6%
Kingston OM8SEP4256Q-A0
10.9 -6%
Apple SSD AP0512
11.1 -4%
SK hynix BC501 HFM256GDGTNG
11.2 -3%
Toshiba BG4 KBG40ZNS128G
11.4 -2%
Toshiba BG4 KBG40ZNT256G
11.6
EDGE NextGen SSD 1TB
11.6 0%
SSSTC CL1-8D512-HP
11.6 0%
Intel SSD 600p SSDPEKKW512G7
11.8 2%
Kingston RBUSNS8154P3512GJ
12.4 7%
256 GB NVMe
12.4 7%
Toshiba KBG30ZMV256G
12.7 9%
Lite-On CL1-8D512
12.8 10%
Silicon Power SP128GIMEA3K5EV0
12.8 10%
Toshiba KBG30ZPZ128G
12.9 11%
...
Kingston Fury Renegade G5 8TB
88.2 660%
0%
100%
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AS SSD - Score Total
1363 Points (8%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Score Write
279 Points (4%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Score Read
748 Points (12%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Access Time Write *
0.2 ms (0%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Access Time Read *
0.3 ms (1%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - 4K-64 Write
155 MB/s (3%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - 4K-64 Read
547 MB/s (11%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - 4K Write
77.8 MB/s (15%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - 4K Read
39.5 MB/s (13%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Sequential Write
464 MB/s (4%)
+ 1 benchmarks and specifications   + Show comparison chart
AS SSD - Sequential Read
1617 MB/s (13%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd 4k_q1t1_write
73.8 MB/s (17%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd 4k_q1t1_read
32.9 MB/s (10%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd 4k_q32t16_write
59 MB/s (1%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd 4k_q32t16_read
661 MB/s (8%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd seq_write
915 MB/s (9%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd seq_read
1500 MB/s (18%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd seq_q8t1_write
1034 MB/s (7%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd seq_q8t1_read
2088 MB/s (13%)
+ 1 benchmarks and specifications   + Show comparison chart
DiskSpd - DiskSpd Loop seq_q8t1_read
2027 MB/s (12%)
+ 1 benchmarks and specifications   + Show comparison chart
01002003004005006007008009001000110012001300140015001600170018001900200021002200Tooltip
- Range of benchmark values
red legend - Average benchmark values
* Smaller numbers mean a higher performance

Add one or more devices and compare

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v1.35
log 08. 20:59:18

#0 ran 0s before starting gpusingle class +0s ... 0s

#1 no ids found in url (should be separated by "_") +0s ... 0s

#2 not redirecting to Ajax server +0s ... 0s

#3 did not recreate cache, as it is less than 5 days old! Created at Sat, 07 Feb 2026 01:05:03 +0100 +0.003s ... 0.003s

#4 composed specs +0.005s ... 0.008s

#5 did output specs +0s ... 0.008s

#6 getting avg benchmarks for device 3821 +0.034s ... 0.041s

#7 got single benchmarks 3821 +0.004s ... 0.046s

#8 got avg benchmarks for devices +0s ... 0.046s

#9 min, max, avg, median took s +3.303s ... 3.348s

#10 return log +0.725s ... 4.074s

Notebook reviews with Toshiba BG4 KBG40ZNT256G

Lenovo ThinkPad X12 laptop review: Detachable with Intel Core i3 is quite slow

Lenovo ThinkPad X12 laptop review: Detachable with Intel Core i3 is quite slow

We have already reviewed the Lenovo ThinkPad X12 Detachable with i7, and now we will update our review of the i3 version. There is one thing to say in advance: we cannot recommend the CPU downgrade to the i3.
Intel Core i3-1110G4 | Intel UHD Graphics 620 | 12.30" | 1.1 kg
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Klaus Hinum (Update: 2022-05- 9)