The Nvidia GeForce RTX 3070 isn’t a spring chicken anymore, but the high prices of modern GPUs mean it’s still a compelling option for those building a gaming PC. But while it’s not as power-hungry as its bigger siblings, you’ll still want a good power supply unit to keep it running at its best. That’s where the best power supplies for the Nvidia GeForce RTX 3070 come in.
Given the slightly more budget-friendly nature of the RTX 3070 compared to more powerful cards, we’ve focused on power supplies that offer great value here. Whether you’re after a 650-watt unit or something slightly more robust, our list has you covered.
- Best 750-Watt PSU for RTX 3070: Cooler Master V750 Gold V2 performs excellently at a more affordable price than other top-tier rivals.
- Best 750-Watt PSU for RTX 3070 Alternative: Be Quiet! Pure Power 11 FM 750 W offers excellent value, with its five-year warranty the only significant drawback.
- Best 650-Watt PSU for RTX 3070: Corsair RM650x continues to be one of the best PSUs in this power range, with the slightly noisy fan on the 2021 version being the only major issue.
- Best 650-Watt PSU for RTX 3070 Alternative: Thermaltake Toughpower GF1 650 W is a solid performer, but we recommend waiting for a sale for maximum value.
- Best SFX PSU for RTX 3080: Seasonic SGX 750 offers high-end performance and an impressive 10-year warranty, all at a competitive price.
The Best Nvidia RTX 3070 PSUs
|Efficiency||80 Plus Gold|
Cooler Master took a risk with its V750 Gold V2 power supplies, opting for an unknown and mostly-unproven manufacturer in Gospower. But the gamble has paid off, as the V750 Gold V2 offers excellent performance at a more affordable price than other top-end 750-watt power supplies.
Nvidia’s RTX 30-series cards are known for big power spikes, so having a power supply with good transient handling is essential. The Cooler Master V750 Gold V2 passes with flying colors here, especially on the all-important 12-volt rail.
Tom’s Hardware recorded a 1.06% deviation on the 12-volt rail, surpassing many of the best 750-watt power supplies on the market. It’s not a massive improvement over other units, but it’s good enough for the Cooler Master unit to top the list.
Overall load regulation is the only area where the Cooler Master V750 Gold V2 stumbles slightly. While 5- and 3.3-volt regulation is as solid as they come, the 12-volt rail recorded a deviation of 1.25% in Tom’s Hardware’s testing. That isn’t a ruinous result, but it’s noticeably worse than the sub-1% deviation of all its major rivals.
Ripple suppression sees the Cooler Master come good after that minor setback, though. Tom’s Hardware recorded 13.86 mV of ripple on the 12-volt rail, which puts it in the upper echelon of 750-watt power supplies. It only trails EVGA and Corsair’s 750-watt units in this test, although it doesn’t trail the former by much.
The V750 Gold V2 manages its great transient handling and ripple suppression without any in-cable capacitors, which is impressive. The main upshot is that this fully modular PSU can ship with thin, ribbon-style cables that are great for cable management.
Cooler Master’s V750 Gold V2 is also a remarkably quiet power supply. Testing shows an average noise level of 25.32 dBA, one of the lowest in Tom’s Hardware’s testing. While we don’t think PSU noise is worth getting too worked up about, having a quiet PSU that won’t add to your rig’s noise output is always nice.
Overall, the Cooler Master V750 Gold V2 is an excellent 750-watt power supply unit perfect for the RTX 3070 and RTX 3070 Ti. Its load regulation could be tighter, but it excels everywhere else. Combine that with its reasonable pricing and 10-year warranty, and you’re on to a winner that’ll power your current rig and be good enough for future upgrades.
The Cooler Master V750 Gold V2 is available in black and white. Unfortunately, low stock levels for the black version at the time of writing mean you’ll have an easier time getting a white unit.
|Efficiency||80 Plus Gold|
Be Quiet!’s Pure Power 11 FM 750 W is an excellent mid-range power supply that’s perfect for building an RTX 3070-powered rig on a tighter budget. You will have to accept a shorter warranty, but there isn’t much to complain about beyond that.
The Pure Power 11 FM 750 W won’t blow your socks off when it comes to transient handling, but neither does it disappoint. TechPowerUp recorded a 1.22% deviation on the 12-volt rail. It’s not the best ever, but it’s solid and well within touching distance of some of the best 750-watt power supplies.
It’s more than good enough for any potential power spikes from the RTX 3070, so you shouldn’t have to worry here.
Load regulation is also impressive, with TechPowerUp recording only a 0.8% deviation on the 12-volt rail. It’s still behind our top 750-watt pick, but the gap is much closer than in transient response (0.73% vs. 0.80%). Impressive results, considering the Be Quiet’s $50 cheaper price.
Things are much the same with ripple suppression. Here, the Be Quiet! Pure Power 11 FM 750 W turns in an impressive 19.11 mV of ripple on the 12-volt rail, well below the 120 mV limits set out in the ATX specification. It’s a great result and mighty impressive for the price.
Like many modern modular power supplies, the Be Quiet! ships with capacitor-less thin ribbon cables. Not only does that make the ripple results even more impressive, but it also means you shouldn’t have any major issues with cable management and routing your power cables.
The Pure Power 11 FM 750 W lives up to the company name regarding noise levels, too. While it has no zero-RPM fan mode, the Pure Power 11 FM runs almost silently below 300 watts and stays below 30 dBA throughout most of its range. It’ll break past the 30 dBA ceiling if you max it out, but you shouldn’t do that anyway.
Be Quiet!’s Pure Power 11 FM 750 W is a great-value budget PSU that trades blows with the best while coming in at a significantly lower price. The five-year warranty is slightly disappointing, but you can’t have it all: we’d take a shorter warranty over compromised performance any day of the week.
|Efficiency||80 Plus Gold|
Corsair’s RM series of power supplies is one of the most highly-regarded out there, and the newest revision of the RM650x is a great addition to the range. It’s pricey for a 650-watt power supply, but you definitely get what you pay for here.
Corsair’s 2021 refresh of the RM650x (and other RMx) power supplies perform almost identically to the older versions, albeit at a slightly higher price. The main difference is in the maglev fan, which we’ll touch on later. So you still get excellent electrical performance here, on par with some of the best PSUs in this power class.
Tom’s Hardware tested the transient response of the 2016 RM650x and recorded an incredible 0.54% deviation on the 12-volt rail. This puts it in the upper echelon of power supplies, regardless of wattage. So you can rest assured that the RM650x will handle any power transients from your hardware, including the RTX 3070.
Load regulation isn’t quite as stunning, but the RM650x (2016)’s 1.18% deviation on the 12-volt rail is still impressive. It’s more than good enough for your RTX 3070, so there’s once again nothing to be overly concerned about here.
Worried about whether the old numbers apply to the 2021 RM650x? If so, Guru3D’s testing should provide some peace of mind. Their testing showed excellent load regulation on the 12-volt rail, with the red and blue lines (which represent the lowest and highest voltages, respectively) overlapping almost perfectly.
The Corsair RM650x also boasts excellent ripple suppression, aided partly by in-cable capacitors. Tom’s Hardware measured 10.3 mV of ripple on the 12-volt rail, which is some of the best ripple suppression you’ll get from a 650-watt power supply.
Only EVGA’s Supernova P2 bests the RM650x in this power class. However, the EVGA’s inflated pricing over the past six months means it’s a much poorer deal than the RM650x.
Unfortunately, the 2021 refresh isn’t a total home run. While the electrical performance is still great, the new maglev fan isn’t quite the upgrade we hoped for. While it’s better on paper, it isn’t necessarily an improvement in the real world.
The RM650x’s zero-RPM fan mode keeps noise output nonexistent at low loads, but the maglev fan hits about 35 dBA at 80% load in Guru3D’s testing, which is significantly louder than the old versions. While we don’t think it’ll ruin your rig’s noise profile, it’ll certainly be audible under load.
However, noise output is a minor gripe in the grand scheme of things. By every other metric, Corsair’s RM650x is an amazing 650-watt power supply that continues the range’s legacy. If you want a premium, ultra-reliable 650-watt PSU, start here.
|Efficiency||80 Plus Gold|
Thermaltake may not be a household name for power supplies, but the brand has several high-quality units that are more than worthy of your attention. The Toughpower GF1 650 W is one of them, offering solid performance at an affordable price.
Despite regularly selling for around or below $100, the GF1 boasts impressive load regulation that competes with pricier 650-watt power supplies. It’s a rock-solid PSU as far as voltages go, with the all-important 12-volt rail only recording an 0.23% deviation in Eteknix’s testing.
While Eteknix didn’t specifically test for transient handling, most PSUs that excel in load regulation also do reasonably well (if not better) with transients. So we’re confident that the GF1 has what it takes to handle reasonable voltage spikes from your hardware.
The GF1’s ripple suppression isn’t as impressive as the voltage regulation. While the 5-volt rail is rock solid, the critical 12-volt rail hits a maximum of 18.4 mV of ripple. It’s still well below the 120-mV limits, but it’s certainly one of the poorer performers on our list.
One reason for the slightly worse ripple is likely due to the capacitor-less cables the GF1 ships with. In-cable capacitors can help reduce ripple significantly at the cost of thicker and less flexible cables. Thermaltake made the right choice here: ripple is still manageable even without the capacitors, while the flat ribbon-style cables make cable management much more straightforward.
Overall, Thermaltake’s Toughpower GF1 650 W is a solid, dependable power supply that will serve any RTX 3070-equipped build well. It’s a good deal at its roughly $120 MSRP, but you can often get them for around $100 or lower if you wait for a sale. If you’re not in a rush, that’s what we recommend doing.
|Efficiency||80 Plus Gold|
If you plan to build a compact gaming rig with an RTX 3070, you’ll need a good SFX power supply to match. While most of the best SFX PSUs will do, the Seasonic SGX 750’s excellent electricals and 10-year warranty make it a great choice for most users.
As with many Seasonic-manufactured power supplies, the SGX 750 exhibits excellent load regulation on all rails. KitGuru put the SGX 750 through its paces and recorded less than 1% deviation on all rails. The 12-volt rail is excellent, only deviating by around 0.5% at its worst.
We’re especially impressed by the essentially perfect regulation at 375 and 565 watts. These loads are around what we expect an RTX 3070-powered PC will draw, so this is great news.
KitGuru doesn’t test for transient loads, but we’re confident that the SGX 750 will handle them well, given how excellent its load regulation is. Even if it’s not quite as perfect, it should be well within spec and be capable of dealing with any power spikes from your RTX 3070 or RTX 3070 Ti.
Unsurprisingly, ripple handling is also a highlight of the SGX 750. The 12-volt rail maxes out at around 20 mV of ripple, which isn’t the lowest you’ll ever see but is still a long way away from the 120-mV limits in the ATX spec. The 3.3- and 5-volt rails perform even better, maxing out at an impressive ten mV.
The Seasonic SGX 750 manages these impressive ripple numbers without any in-cable capacitors, either. While you could argue that capacitors would bring the 12-volt ripple down to 10 mV, we don’t think it’s a worthwhile tradeoff. We’d much rather have flat cables to avoid cable clutter in a compact Mini-ITX case.
Despite the potential heat issues of cramming this much power into an SFX form factor, the SGX 750 never relies on high fan speeds to keep components cool. The Seasonic runs well under 30 dBA through most of its range, only becoming audible once you start drawing around 700 watts.
Unlike its closest competitor, the Corsair SF750, the Seasonic comes with a 10-year warranty. So while it may not quite best the Corsair on all fronts, the extra three years of warranty coverage more than makes up for it. Overall, the Seasonic SGX 750 is an excellent SFX PSU perfect for any RTX 3070 or 3070 Ti-powered rig.
Seasonic also sells an SGX 650, which is a compelling option if you don’t think you’ll need the extra headroom of the SGX 750.
What PSU Do I Need for an RTX 3070?
Nvidia recommends a 650-watt power supply for the RTX 3070 and a 750-watt unit for the RTX 3070 Ti. While we generally recommend going with a higher-wattage PSU than Nvidia’s suggestions, we think you’re safe going with Nvidia’s power consumption guidelines here for the RTX 3070.
That said, you should also check the manufacturer’s recommendation for the specific RTX 3070 graphics card you’re buying. It’s especially important if you’re buying a factory overclocked GPU, or plan to do any overclocking yourself.
Asus, for example, recommends a 750-watt power supply for its RTX 3070 TUF Gaming OC. While you could likely get by with a 650-watt PSU, there’s no reason to risk it unless you’re on a really tight budget.
Unsure of how much power your rig will draw? Check out one of the many power supply calculators out there, such as OuterVision’s PSU calculator. Select your hardware (including the RTX 3070) from the drop-down menus, and the calculator will provide a rough estimate of your gaming PC’s power draw and often recommend a suitable PSU.
That said, we don’t recommend going with a sub-650-watt PSU, even if the calculator says otherwise. RTX 30-series cards are known for some significant power spikes. While the RTX 3070’s lower overall power draw helps reduce the severity of the power surges, they’re still capable of overloading a lower-power PSU if you’re unlucky. So we recommend playing it safe and going with a 650-watt PSU at the very least.
Need tips on how to choose a power supply unit? Check out our guide to choosing a power supply for a thorough run-down of all the vital terms and specs.
Nvidia’s GeForce RTX 3070 may seem old hat by now, but it’s still a capable high-end card that can punish cheap PSUs with its power draw and power spikes. So while it’s not quite as demanding as its RTX 3080 sibling, it still demands a high-quality power supply that can provide enough power for it and your other components.
If you’re after a 750-watt PSU, Cooler Master’s V750 Gold V2 is an obvious first choice, with its excellent electricals and reasonable pricing. If you’re on a tighter budget and don’t mind dropping to a 650-watt unit, the Corsair RM650x’s proven performance and build quality make it a great option.
Are you thinking of stepping up to an RTX 3080 instead? We’ve got you covered! Head over to our list of the best power supplies for the RTX 3080 for our recommendations.