Buying Guide
The Best 650W PSUs for Gaming by Warranty
We weighed four power supplies on rated output and native 12V-2x6 cable count, and the Thermaltake Smart BM3 650W costs the least.
By The PC Journal editorial team
11 min read4 products evaluated
A 650W PSU suits a mid-range gaming PC, and a long warranty is a sign of build quality. Every pick is 650W, ordered by warranty length.
The order reflects wattage, native 12V-2x6 cables and warranty from maker specifications; we did not test these power supplies ourselves, and a missing native 12V-2x6 cables is flagged, not filled in.
Quick Picks
Our 4 recommendations at a glance. Tap a pick for the full verdict.
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)
Lowest Price Here
Thermaltake Smart BM3 650W
A lower price than the SAMA GT650 White and the rest when we checked.
Best for: Spending as little as possible.
Our take Check price for Thermaltake Smart BM3 650W (opens in a new tab)
Strong Alternative
SAMA GT650 White
An ECO silent mode for low-load quiet.
Best for: Buyers who want ECO silent mode for low-load quiet.
Our take Check price for SAMA GT650 White (opens in a new tab)
Premium Pick
be quiet! Pure Power 12 650W
A temperature-controlled 120mm be quiet! fan at the highest price in the group.
Best for: Buyers for whom price is not the deciding factor.
Our take Check price for be quiet! Pure Power 12 650W (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| 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) |
| A lower price than the SAMA GT650 White and the rest when we checked. | Spending as little as possible. | Check price for Thermaltake Smart BM3 650W (opens in a new tab) |
| An ECO silent mode for low-load quiet. | Buyers who want ECO silent mode for low-load quiet. | Check price for SAMA GT650 White (opens in a new tab) |
| A temperature-controlled 120mm be quiet! fan at the highest price in the group. | Buyers for whom price is not the deciding factor. | Check price for be quiet! Pure Power 12 650W (opens in a new tab) |
Our Picks
Also Consider1 of 4
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
- If budget leads, the Thermaltake Smart BM3 650W was cheaper at our last price check.
Why we like it
Its 135mm FDB fan has a zero RPM mode, and it uses 100% Japanese capacitors. It shares a gold 80 plus rating with the be quiet! Pure Power 12 650W; the Thermaltake Smart BM3 650W goes with a bronze 80 plus rating. Like the SAMA GT650 White, it has fully modular cabling, while the Thermaltake Smart BM3 650W uses semi-modular cabling.
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. On price it sat third of 4, between the cheaper SAMA GT650 White and the pricier be quiet! Pure Power 12 650W, 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 Thermaltake Smart BM3 650W at the time of writing
Lowest Price Here2 of 4
Thermaltake Smart BM3 650W on Amazon (opens in a new tab)
The Thermaltake Smart BM3 650W stands out for Japanese 105°C main capacitor, and it adds semi-modular cables: fixed main cables, detachable extras.
Best for
- Spending as little as possible.
Skip if
- Pass on it if a shorter 5-year warrant rules it out for your setup.
Why we like it
It also offers a 650W rated output and offers a 5 years warranty. It is 80 Plus Bronze and ATX 3.1 compliant for PCIe Gen 5 cards, with industrial-grade protections built in. No other pick in this guide offers a bronze 80 plus rating; compare the MONTECH Century II 650W, which has a gold 80 plus rating.
You get semi-modular cabling here, which sets it apart from the SAMA GT650 White and its fully modular cabling. Like the MONTECH Century II 650W and be quiet! Pure Power 12 650W, it has a black colour, while the SAMA GT650 White uses a white colour. It cost the least of the 4 picks at the time of writing, with the SAMA GT650 White the next step up. There is no published native 12V-2x6 cable count figure, whereas the MONTECH Century II 650W offers 1.
Key dimensions & specs
- Wattage: 650W
- Warranty: 5 years
- 80 Plus rating: Bronze
- ATX version: ATX 3.1
- Form factor: ATX
- Cabling: Semi-modular
- Fan: 120mm
- Fan stop: Yes
- Colour: Black
Pros
- A 650W rating
- ATX 3.1 compliance
- A fan that stops at low load
- Japanese 105°C main capacitor
Cons
- A shorter 5-year warranty
- Only 80 Plus Bronze efficiency
- No published native 12V-2x6 cable count
Strong Alternative3 of 4
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
- Buyers who want ECO silent mode for low-load quiet.
Skip if
- The maker gives no warranty, so look elsewhere if that figure decides it for you.
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. Like the MONTECH Century II 650W, it has fully modular cabling, while the Thermaltake Smart BM3 650W uses semi-modular cabling.
A white colour is unique to it among these picks, while the MONTECH Century II 650W 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.
Its price falls between the Thermaltake Smart BM3 650W and the MONTECH Century II 650W, based on our last check. Buyers who need a confirmed warranty should compare it with the MONTECH Century II 650W, which offers 10 years.
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
Cons
- No published warranty
- Costs more than the Thermaltake Smart BM3 650W at the time of writing
Premium Pick4 of 4
be quiet! Pure Power 12 650W on Amazon (opens in a new tab)
be quiet!'s Pure Power 12 650W has a native 12V-2x6, two PCIe 8-pin connectors and a single strong 12V rail.
Best for
- Buyers for whom price is not the deciding factor.
Skip if
- Its warranty is not published, which rules it out if you need that number.
Why we like it
It is 80 Plus Gold rated at up to 92.7% efficiency, and LLC topology gives tight voltage regulation. The 120mm fan is temperature-controlled. One 12V rail handles short GPU power excursions.
It shares a gold 80 plus rating with the MONTECH Century II 650W; the Thermaltake Smart BM3 650W goes with a bronze 80 plus rating. No depth is rated for the be quiet! Pure Power 12 650W, so check the maker's page against your case's PSU bay. It was the highest-priced of the 4 picks at the time of writing, so the case for it rests on what it adds over the MONTECH Century II 650W and the rest.
Key dimensions & specs
- Wattage: 650W
- Native 12V-2x6 cables: 1
- PCIe 8-pin connectors: 2
- 80 Plus rating: Gold
- ATX version: ATX 3.1
- Form factor: ATX
- Fan: 120mm
- Colour: Black
Pros
- A 650W rating
- A native 12V-2x6 cable for 16-pin cards
- ATX 3.1 compliance
- Temperature-controlled 120mm be quiet! fan
Cons
- No published warranty
- Costs more than the Thermaltake Smart BM3 650W at the time of writing
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- How these picks were ranked
- We set side by side four power supplies on rated output, native 12V-2x6 cable count, warranty and 80 Plus rating, using each maker's published specs. We did not test them in-house.
- What every pick has in common
- All 4, from the MONTECH Century II 650W to the be quiet! Pure Power 12 650W, state rated output, ATX version and form factor and share ATX 3.1 ATX version.
- Where the specs have gaps
- The Thermaltake Smart BM3 650W gives no native 12V-2x6 cable count; the SAMA GT650 White and the be quiet! Pure Power 12 650W give no warranty.
- Price range
- From the Thermaltake Smart BM3 650W to the be quiet! Pure Power 12 650W, all sat in the $50 to $100 tier when we checked.
What to Look for in a 650W PSUs for Gaming by Warranty
Key buying criteria so you get the right fit the first time.
How much warranty you need
Here warranty runs from 5 years on the Thermaltake Smart BM3 650W to 10 years on the MONTECH Century II 650W. Start with the MONTECH Century II 650W if warranty decides it. No figure for the SAMA GT650 White and the be quiet! Pure Power 12 650W.
Cabling
The MONTECH Century II 650W and the SAMA GT650 White list Fully modular; the Thermaltake Smart BM3 650W lists Semi-modular. Rule out the mismatches before looking at price.
What to check at home
The MONTECH Century II 650W comes with a native 12V-2x6 cable, so a 16-pin card plugs in without an adapter. The Thermaltake Smart BM3 650W has no stated native 12V-2x6 cable; confirm the cable kit before pairing it with a 16-pin card.
Extras that separate them
The Thermaltake Smart BM3 650W: semi-modular cables: fixed main cables, detachable extras. The SAMA GT650 White: embossed white cables. The be quiet! Pure Power 12 650W: a single strong 12V rail.
Where your budget lands
All 4 sat in one tier when we checked, from the Thermaltake Smart BM3 650W at the low end to the be quiet! Pure Power 12 650W at the top, so decide on features first.
How to Choose a 650W PSUs for Gaming by Warranty
By priority
| Priority | Consider | Why |
|---|---|---|
| Buyers who want 10-year warranty at a low price | MONTECH Century II 650W | A 10-year warranty at a low price |
| Spending as little as possible | Thermaltake Smart BM3 650W | A lower price than the SAMA GT650 White and the rest when we checked |
| Buyers who want ECO silent mode for low-load quiet | SAMA GT650 White | An ECO silent mode for low-load quiet |
| Buyers for whom price is not the deciding factor | be quiet! Pure Power 12 650W | A temperature-controlled 120mm be quiet! fan at the highest price in the group |
Scroll sideways to see every column.
Key specs side by side
The MONTECH Century II 650W leads on warranty at 10 years, ahead of the Thermaltake Smart BM3 650W at 5 years. "Not listed" means the maker leaves that figure out.
| Power supplie | Wattage | Native 12V-2x6 cables | Warranty | 80 Plus rating |
|---|---|---|---|---|
| MONTECH Century II 650W | 650W | 1 | 10 years | Gold |
| Thermaltake Smart BM3 650W | 650W | Not listed | 5 years | Bronze |
| SAMA GT650 White | 650W | 1 | Not listed | Not listed |
| be quiet! Pure Power 12 650W | 650W | 1 | Not listed | Gold |
Scroll sideways to see every column.
Frequently Asked Questions
Which has the longest warranty: the MONTECH Century II 650W or the Thermaltake Smart BM3 650W?
The MONTECH Century II 650W leads at 10 years, with the Thermaltake Smart BM3 650W at 5 years. The SAMA GT650 White and the be quiet! Pure Power 12 650W don't state a figure, so they sit outside this comparison.
Why is the be quiet! Pure Power 12 650W our Premium Pick pick?
It earns the label for a temperature-controlled 120mm be quiet! fan at the highest price in the group. It suits buyers for whom price is not the deciding factor.
Do the MONTECH Century II 650W and the Thermaltake Smart BM3 650W differ on 80 Plus rating?
The MONTECH Century II 650W and the be quiet! Pure Power 12 650W use Gold; the Thermaltake Smart BM3 650W uses bronze. The maker of the SAMA GT650 White 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 third of 4.
What extras do the MONTECH Century II 650W and the Thermaltake Smart BM3 650W include?
The MONTECH Century II 650W: a 10-year warranty at a low price. The Thermaltake Smart BM3 650W: Japanese 105°C main capacitor. The SAMA GT650 White: an ECO silent mode for low-load quiet.
Bottom Line
Our first pick is the MONTECH Century II 650W, chosen for a 10-year warranty at a low price. Look at the Thermaltake Smart BM3 650W for a lower price than the SAMA GT650 White and the rest when we checked, the SAMA GT650 White for an ECO silent mode for low-load quiet and the be quiet! Pure Power 12 650W for a temperature-controlled 120mm be quiet! fan at the highest price in the group if those matter more to you.
Check for the PCIe cables your GPU needs.