Short answer: fully modular is easiest to build with and keeps your case tidy, which is why most of my picks are fully modular. Semi modular and non modular units work just as well electrically, and they’re fine on a budget if your case has room for spare cables.
The three types
| Type | What it means | Best for |
|---|---|---|
| Fully modular | Every cable detaches, including the motherboard cable | Tidy builds, small cases, easy upgrades |
| Semi modular | The main motherboard and processor cables are fixed, the rest detach | A middle ground on price |
| Non modular | Every cable is fixed to the unit | Budget builds with room to hide cables |
Does it affect performance?
No. Modular is about convenience. It doesn’t change how much power the unit delivers or how clean that power is. A good non modular unit beats a poor fully modular one every time.
What you actually connect
A typical gaming PC uses only a handful of cables:
| Cable | What it powers | Almost every build? |
|---|---|---|
| 24-pin | The motherboard | Yes |
| 8-pin processor (EPS) | The processor, near the top of the board | Yes, one or two |
| Graphics card | The card: 12V-2x6 or 8-pin PCIe | Yes, unless the card has no power plug |
| SATA | SSDs, hard drives, some fans and lighting hubs | Often one |
| Molex | Older fans and accessories | Rarely |
With a non modular unit, all the others come attached anyway. They need to be tied up and tucked somewhere, usually in the basement shroud or behind the motherboard tray.
Why most of my picks are fully modular
Of the 116 power supplies on my list, 106 are fully modular, 2 are semi modular and 8 are non modular. Every Tier A unit is fully modular.
- Easier building. You can fit the power supply first and add cables as you go.
- Better airflow and looks. No spare cables crammed into the case.
- Easier upgrades. Adding a drive or changing a graphics card means adding a cable, not rerouting a bundle.
- Custom cables. You can fit sleeved cables made for your model.
When non modular makes sense
- You’re on a tight budget and the case has a shroud or plenty of room behind the motherboard tray.
- You build it once and rarely open the case.
- You want to avoid any chance of mixing up cables later, since fixed cables can’t be swapped by mistake.
One rule for modular cables
Modular cables are not interchangeable between brands or models. Read why you should never reuse them before you swap a power supply.
Cable management tips
- Plan the routes before plugging in. Fit the 24-pin and processor cables first, since they’re the hardest to reach later.
- Run the graphics card cable without a sharp bend near the plug.
- Keep the spare modular cables in the box with the power supply so they never get mixed up.
Picks by type
- Fully modular, compact · Tier ASeasonic Core GX ATX 380 Plus Gold · Fully modular · ATX · 650/750/850WJust 140mm deep, so it suits smaller cases.Check 850W price
- Fully modular, side sockets · Tier ACorsair RMx Shift80 Plus Gold · Fully modular · ATX · 750/850/1000WCables run straight to the back of the case. Check your case suits it.Check 850W price
- Semi modular, budget · Tier CThermaltake SMART BM380 Plus Bronze · Semi modular · ATX · 650/750/850WBronze, at 650W to 850W.Check 650W price
- Non modular, budget · Tier CRaidmax Cobra ATX 3.180 Plus Gold · Non modular · ATX · 650/750/850WGold rated with ATX 3.1, at 650W to 850W.Check 750W price
For small cases, fully modular matters more than usual. See the best SFX power supplies.
Questions
Does modular affect performance?
No. It is about convenience and cable management, not power quality.
Is semi modular worth it?
It’s a reasonable middle ground. The cables you always use are fixed, and the rest are optional.
Do modular connectors add resistance?
Each connection adds a tiny amount, but on a good unit it makes no practical difference.
Can I make a non modular power supply modular?
No. The cables are wired inside the unit. Don’t cut or modify them.
What should I do with spare modular cables?
Keep them with the power supply in a labelled bag, in case you need them later.
Sources
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