Rank #1 in Best PC Cases 2026: 10 Ranked, and Why the Fan Count Misleads
Corsair FRAME 4000D RS ARGB Mid-Tower ATX Case
Price and rating as shown on Amazon when we collected them. Both change.
The Corsair FRAME 4000D RS ARGB is the case at the top of this guide: £87.99, rated 4.7 out of 5 across 1,888 ratings. It is a mid tower built around Corsair's FRAME modular system, with three RS ARGB PWM fans already fitted in the front and an InfiniRail steel rail for rearranging the rest.
It is also the listing where the fan figures hold up. The title says 3x pre-installed RS ARGB fans, the second bullet says the same, and the spec table's "Number of Fans" field reads 3 — the contents, not a capacity. The capacity is quoted separately, as "up to twelve 120mm fans" in the Compatible Devices line, so the two numbers are describing two different things rather than contradicting each other. The other figures sit in the same table: Fan Size reads 140 mm, the InfiniRail bullet quotes up to 200 mm in the front and 140 mm in the roof, Internal Bays Quantity reads 3, and Antenna Location reads "Gaming". Everything on this page is taken from the Amazon listing, not from a test of our own.
How those 1,888 ratings break down
An average hides its own shape. This is the spread behind the 4.7 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £87.99 |
|---|---|
| Rating | 4.7 out of 5, from 1,888 ratings |
| Fans fitted | 3x Corsair RS ARGB PWM, pre-installed in the front |
| Fans the case holds | Up to twelve 120mm, per the Compatible Devices line |
| Fan size | 140 mm (as listed) |
| Internal bays | 3 (as listed) |
| Expansion slots | 7 |
| Antenna location | Gaming (as listed) |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“An absolute beast of a case, with loads of room for components and cabling. Fans are strong and provide strong cooling, looks beautiful (especially with the controllable front RGB fans). Removal of side and top panels, and and reassembly made easy with thumbscrews, and sliding side panels make it a piece of cake to open up to install / replace internal components”
Verified purchase“Love this case. Used with X870 MOB, 9070XT and a 360 AIO. Big difference compared to my old case for air flow. Lots of mods, easy access and just overall a very good case.”
What it is up against
The rivals it was ranked against in Best PC Cases 2026: 10 Ranked, and Why the Fan Count Misleads.
Questions people ask
How many fans come with the Corsair FRAME 4000D RS ARGB?
Three. The title says "3x Pre-Installed RS ARGB Fans", the second bullet says three Corsair RS ARGB PWM fans are pre-installed in the front, and the spec table's Number of Fans field also reads 3. On this listing the field matches the box.
Does "Number of Fans: 3" mean the case holds only three fans?
No. The same listing's Compatible Devices line gives a capacity of up to twelve 120mm fans, so the 3 is the contents figure and the twelve is the capacity figure. Both are on the Corsair FRAME 4000D RS ARGB product page.
Why does the spec table list "Antenna Location: Gaming"?
It does, as listed. A case has no antenna. That field appears on the FRAME 4000D RS ARGB listing and tells you nothing about the chassis.
Which motherboard and graphics card sizes does it take?
The Supported Motherboard field reads ATX, and the Compatible Devices line lists ATX motherboards, full-size graphics cards and expansion cards up to 400mm in length.
How many USB ports does the front panel have?
Three. Both the Total USB 3.0 Ports and Total USB Ports fields read 3.
Is a power supply included with the Corsair FRAME 4000D RS ARGB?
The listing does not say one is included. It lists standard PSUs among the compatible devices and gives the mounting type as rear mount.
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