Buying Guide
The Best Fully Modular 650W PSUs
Three power supplies ranked on rated output and native 12V-2x6 cable count; the SAMA GT650 White is the cheapest route in.
By The PC Journal editorial team
11 min read3 products evaluated
Full modularity helps in small builds with limited space. Every pick is a 650W fully modular unit, ordered from the lowest price.
We ranked these power supplies on wattage, native 12V-2x6 cables and ATX version using manufacturer specifications; where a maker leaves out native 12V-2x6 cables, we say so rather than guess, since we have not benched them.
Quick Picks
Our 3 recommendations at a glance. Tap a pick for the full verdict.
Lowest Price Here
SAMA GT650 White
The cheapest way into this group, below the MONTECH Century II 650W.
Best for: Getting ECO silent mode for low-load quiet for the least money.
Our take Check price for SAMA GT650 White (opens in a new tab)
Also Consider
MONTECH Century II 650W
A 10-year warranty at a low price.
Best for: Buyers who want 10-year warranty at a low price.
Our take Check price for MONTECH Century II 650W (opens in a new tab)
Premium Pick
CORSAIR RM650e (ATX 3.1)
105°C-rated capacitors at the highest price in the group.
Best for: Buyers for whom price is not the deciding factor.
Our take Check price for CORSAIR RM650e (ATX 3.1) (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| The cheapest way into this group, below the MONTECH Century II 650W. | Getting ECO silent mode for low-load quiet for the least money. | Check price for SAMA GT650 White (opens in a new tab) |
| A 10-year warranty at a low price. | Buyers who want 10-year warranty at a low price. | Check price for MONTECH Century II 650W (opens in a new tab) |
| 105°C-rated capacitors at the highest price in the group. | Buyers for whom price is not the deciding factor. | Check price for CORSAIR RM650e (ATX 3.1) (opens in a new tab) |
Our Picks
Lowest Price Here1 of 3
SAMA GT650 White on Amazon (opens in a new tab)
SAMA's GT650 White is a fully modular white unit with embossed white cables, a native 12V-2x6 cable and an ECO silent mode.
Best for
- Getting ECO silent mode for low-load quiet for the least money.
Skip if
- Look at the other picks if you need a feature not covered above.
Why we like it
Japanese capacitors support long-term durability, and a native 12V-2x6 connector feeds current graphics cards. It is 80 Plus Gold rated. A white colour is unique to it among these picks, while the CORSAIR RM650e uses a black colour.
The SAMA GT650 White comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the SAMA GT650 White, so check the maker's page against your case's PSU bay. It also brings ATX 3.1 compliance. It was the cheapest of the group when we checked; the MONTECH Century II 650W was the next step up.
Key dimensions & specs
- Wattage: 650W
- Native 12V-2x6 cables: 1
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 120mm
- Fan stop: Yes
- Colour: White
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Fully modular cables
Also Consider2 of 3
MONTECH Century II 650W on Amazon (opens in a new tab)
Montech's Century II 650W brings a native 12V-2x6 cable, fully modular cables and a 10-year warranty to a low-cost 80 Plus Gold unit.
Best for
- Buyers who want 10-year warranty at a low price.
Skip if
- Skip it if price comes first: the SAMA GT650 White cost less when we checked.
Why we like it
Its 135mm FDB fan has a zero RPM mode, and it uses 100% Japanese capacitors. It shares a black colour with the CORSAIR RM650e; the SAMA GT650 White goes with a white colour. The MONTECH Century II 650W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter.
No depth is rated for the MONTECH Century II 650W, so check the maker's page against your case's PSU bay. Another plus is ATX 3.1 compliance. On price it sat second of 3, between the cheaper SAMA GT650 White and the pricier CORSAIR RM650e, at the time of writing.
Key dimensions & specs
- Wattage: 650W
- Native 12V-2x6 cables: 1
- Warranty: 10 years
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 135mm
- Fan stop: Yes
- Colour: Black
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- A 10-year warranty
- ATX 3.1 compliance
Cons
- Costs more than the SAMA GT650 White at the time of writing
Premium Pick3 of 3
CORSAIR RM650e (ATX 3.1) on Amazon (opens in a new tab)
The CORSAIR RM650e stands out for 105°C-rated capacitors, and it adds Modern Standby support for fast wake from sleep.
Best for
- Buyers for whom price is not the deciding factor.
Skip if
- The maker gives no native 12V-2x6 cable count, so look elsewhere if that figure decides it for you.
Why we like it
It also offers a 650W rated output and offers a 120mm fan. It is Intel ATX 3.1 certified, handles 2x GPU transient spikes, and a 120mm rifle-bearing fan follows a quiet fan curve. It shares a black colour with the MONTECH Century II 650W; the SAMA GT650 White goes with a white colour.
The CORSAIR RM650e has no stated native 12V-2x6 cable; confirm the cable kit before pairing it with a 16-pin card. No depth is rated for the CORSAIR RM650e, so check the maker's page against your case's PSU bay. It was the most expensive pick when we checked, so weigh what it adds over the MONTECH Century II 650W. If rated output is your priority, the SAMA GT650 White (650W) is the stronger choice.
Key dimensions & specs
- Wattage: 650W
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Fully modular
- Fan: 120mm
- Colour: Black
Pros
- A 650W rating
- ATX 3.1 compliance
- Fully modular cables
- 105°C-rated capacitors
Cons
- No published native 12V-2x6 cable count
- Costs more than the SAMA GT650 White at the time of writing
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- The figures behind the order
- We set side by side three power supplies on rated output, native 12V-2x6 cable count, ATX version and form factor, using each maker's published specs. We did not test them in-house.
- What every pick has in common
- All 3, from the SAMA GT650 White to the CORSAIR RM650e, state rated output, ATX version and form factor and share ATX 3.1 ATX version and Fully modular cabling.
- Where the specs have gaps
- The CORSAIR RM650e gives no native 12V-2x6 cable count; the CORSAIR RM650e gives no fan stop.
- Price range
- At our last check the picks ran from the SAMA GT650 White ($50 to $100) to the CORSAIR RM650e ($100 to $150).
What to Look for in a Fully Modular 650W PSUs
Key buying criteria so you get the right fit the first time.
Fit and compatibility
The SAMA GT650 White comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. The CORSAIR RM650e has no stated native 12V-2x6 cable; confirm the cable kit before pairing it with a 16-pin card.
Extras that separate them
The SAMA GT650 White: embossed white cables. The MONTECH Century II 650W: a 135mm fan with a zero-RPM mode. The CORSAIR RM650e: Modern Standby support for fast wake from sleep.
Where your budget lands
$50 to $100 buys the SAMA GT650 White and the MONTECH Century II 650W; $100 to $150 buys the CORSAIR RM650e at our last check.
Start from what matters most
Getting ECO silent mode for low-load quiet for the least money: the SAMA GT650 White. Buyers for whom price is not the deciding factor: the CORSAIR RM650e.
Use the warranty as a quality signal
Long warranties of seven to twelve years show how long a maker expects a unit to last. A power supply often moves from one build to the next, so the warranty matters.
How to Choose a Fully Modular 650W PSUs
By priority
| Priority | Consider | Why |
|---|---|---|
| Getting ECO silent mode for low-load quiet for the least money | SAMA GT650 White | The cheapest way into this group, below the MONTECH Century II 650W |
| Buyers who want 10-year warranty at a low price | MONTECH Century II 650W | A 10-year warranty at a low price |
| Buyers for whom price is not the deciding factor | CORSAIR RM650e | 105°C-rated capacitors at the highest price in the group |
Scroll sideways to see every column.
Key specs side by side
The SAMA GT650 White, the MONTECH Century II 650W and the rest, as their makers list them.
| Power supplie | Wattage | Native 12V-2x6 cables | ATX version | Form factor |
|---|---|---|---|---|
| SAMA GT650 White | 650W | 1 | ATX 3.1 | ATX |
| MONTECH Century II 650W | 650W | 1 | ATX 3.1 | ATX |
| CORSAIR RM650e | 650W | Not listed | ATX 3.1 | ATX |
Scroll sideways to see every column.
By price at the time of writing
The SAMA GT650 White was the lowest-priced pick and the CORSAIR RM650e the highest when we checked; tiers move with Amazon pricing.
| Price tier | Power supplies |
|---|---|
| About $50 to $100 | SAMA GT650 White, MONTECH Century II 650W |
| About $100 to $150 | CORSAIR RM650e |
Frequently Asked Questions
Why is the SAMA GT650 White our Lowest Price Here pick?
It earns the label for the cheapest way into this group, below the MONTECH Century II 650W. It suits getting ECO silent mode for low-load quiet for the least money.
Does the SAMA GT650 White have fan stop, and which others do?
The SAMA GT650 White and the MONTECH Century II 650W have it. The maker of the CORSAIR RM650e doesn't say.
Will the SAMA GT650 White work with my setup?
The SAMA GT650 White comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. No depth is rated for the SAMA GT650 White, so check the maker's page against your case's PSU bay. In this guide it ranks first of 3, as our Lowest Price Here pick.
What extras do the SAMA GT650 White and the MONTECH Century II 650W include?
The SAMA GT650 White: an ECO silent mode for low-load quiet. The MONTECH Century II 650W: a 10-year warranty at a low price. The CORSAIR RM650e: 105°C-rated capacitors.
Should I pick the SAMA GT650 White or the CORSAIR RM650e?
The SAMA GT650 White suits getting ECO silent mode for low-load quiet for the least money; the CORSAIR RM650e suits buyers for whom price is not the deciding factor.
Bottom Line
Our first pick is the SAMA GT650 White, chosen for the cheapest way into this group, below the MONTECH Century II 650W. Look at the MONTECH Century II 650W for a 10-year warranty at a low price and the CORSAIR RM650e for 105°C-rated capacitors at the highest price in the group if those matter more to you.
Count the PCIe plugs against your GPU before ordering.