ConnexionAntec 900 Case Review (2026)
Antec launched the original 900 case way back in 2006 which means this brand new 900 marks the 20th anniversary of this model. The name is the only thing they have retained while everything else has changed, and that is good as the original 900 was a bit weird. One major change is that the original 900 was aimed squarely at gamers while this new 900 is more of a workstation case, with acres of space and huge amounts of cooling.
Time stamps
00:00 Intro
00:39 Starting the tear down
01:55 Getting to the rear
02:23 Storage details
03:23 Fan connections / cooling support
05:39 System hardware
06:46 The PSU iShift kit
09:03 CPU cooler + GPU going in
10:10 Thermal tests
11:33 Closing thoughts
Specification:
- Motherboard support: ATX, E-ATX, SSI-CEB and SSI-EEB.
- Power supply support: ATX.
- Expansion slots: 8.
- Included fans: 3x 140mm Tranquil front intake, 2x 120mm P12R on the PSU shroud, 1x 140mm Tranquil rear exhaust.
- Fan mounts: 3x 120mm/140mm or 2x 200mm front, 3x 120 or 2x 140mm roof, 2x PSU shroud, 1x 120mm/140mm rear.
- Radiator mounts: 360mm/420mm front, 280mm/360mm roof.
- 5.25-inch optical drive bays: None.
- Internal drive bays: 4x 3.5-inch/2.5-inch, 5x 2.5-inch.
- Front I/O ports: 1x USB 3.0 type-A, 1x USB 3.1 type-C, audio.
- Dimensions: 622mm H x 547mm D x 250mm W.
Testing
To put this case through its cooling paces we will be using a test system consisting of an AMD Ryzen Threadripper 9980X, Palit RTX 5080 graphics and an SSD. This system allows us to produce a substantial amount of heat and effectively test the Antec 900‘s cooling capabilities.
Test System:
- Processor: AMD Ryzen Threadripper 9980X
- CPU Cooler: AMD Threadripper AIO cooler
- Motherboard: Gigabyte TRX50 AI TOP
- Memory: 128GB G.Skill T5 Neo RDIMM DDR5-6400 in Quad Channel
- Graphics card: Palit RTX 5080 Gamerock OC 16GB
- Power supply: Antec Signature 2200 Platinum 2200W
- SSD: Crucial T705 Gen5 M.2 NVMe
- OS: Windows 11
The loads on our test system were very high with a total system power draw of 880W at the wall socket, split evenly between the 64-core Threadripper CPU and RTX 5080 graphics card. We found the Antec 900 was able to cool efficiently without too much noise, however when we ramped up the fans to around 2,000rpm the noise levels became offensive.
Closing Thoughts
In the 20 years since Antec launched the original 900, every single aspect of PCs, gaming and workstations has changed. While we like the nod to the original name we feel it is slightly confusing and best forgotten, as the Antec 900 (2026) is completely different to the Antec 900 (2006), and we mean that in a good way.
You can pack a huge amount of hardware in this cavernous case, and you can see that our huge Threadripper motherboard and mighty Palit RTX 5080 graphics card are somewhat lost in all that space. The upside is that you can run your cooling system low and slow and still get a good temperatures with low noise. On the other hand we recommend you don't move your finished PC around too much as it is likely to weigh a tonne.
MSRP pricing for the Antec 900 is £249/€289 EURO inc VAT.
Pros:
- Massive main compartment.
- Smart styling.
- Easy access to the storage bays and power supply.
Cons:
- A PWM hub is not included.
- The position of the top fan/radiator mounts don't have much flexibility.
- The accessory kit doesn’t include spare catches for the panel mounts.
KitGuru says: The new Antec 900 is big and beefy and well-suited to your next workstation build.
Ultra X9 Series 3 with discrete-level GPU acceleration, unlocking exceptional power for AI, rendering, and gaming on the go.
