Doing a build with a 9800x3d and 5070ti and the sites are recommending a PSU that is as low at 750w. Would 750w limit performance on either the CPU or GPU with 750w? I figured the bare minimum would be 800-850w for the 9800x3d and 5070ti combo.

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OffensiveOdor@reddit

I personally just get a 1000w or 1200w psu with every new build I do.

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Would you enjoy saving $$$ with little to no noticeable difference in performance? I see the 4080 used is only $780 on eBay, and a used 7800X3D is around $280 on my local FB marketplace. RAM is similarly $200-300 for 32GB 6000 or better RAM.

You literally cannot see the performance difference in those two setups. Cooler Master MWE Gold 750 V3 is only $80, its a good PSU, the 850 v3 is only $99, but they have used for $70, which I am not ashamed to use.

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Plenty_Article11@reddit

Nvidia recommends a 700w with that card, and they are generally fairly conservative.

Tests have shown the 9800x3d can draw up to 160w, but when gaming its more like 60w-80w

With a power draw of 300w for card and 80w for CPU, I wouldn't be ashamed to run it on a Platinum 500w (these are rare), or a tier A or B 600w Gold power supply.

750w is fine, 850w is fine.

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DJKaotica@reddit

I have a Corsair SF750, so SFX, 80+ Platinum certified, driving a 9800x3d and a 5080 (Gigabyte GeForce RTX 5080 AERO OC SFF 16G) and haven't had any issues with it.

Initially using Windows 11, now using CachyOS.

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Ket_Yoda_69@reddit

Websites will often suggest those things as a way to move the merchandise even when a higher wattage like 850 might more appropriate for a lot of users. I have a 1000w with a 3080ti and a 5900x (got that all at the start of the pandemic mind you). That might be overkill but with all of the things I have plugged into my computer too, and the power spikes things can have, I wanted to have a nice cushion of space without going to something like a 1200w for what I have.

Using a tool like this can help give a rough estimate of what the cpu+gpu draw along with drives: https://www.newegg.com/tools/power-supply-calculator

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YSvetta@reddit

I'm using 750W on my 9800x3d + 5080 rig. You'd be fine with a high quality 750W psu.

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my5cworth@reddit

I run my x3d & 5070ti on an existing 750W corsair just fine...HOWEVER, if I was building a new rig I wouldn't go below 850W.

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dirtydragondan@reddit

exactly this.

currently 5800X3d + 5070 on a corsair RM750x PSU

its well in range with headroom.
But going any more (newer/hungrier x3d and more than 5070) would aim for 850W base for the same assurances.

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Syrath36@reddit

Better to go over for future proofing is how I approach it. I moved to a 9800x3d and 5080. I went with 1k watts.

I also have other small USB devices drawing power or using a sata that can add up as well.

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PragmaticNeighSayer@reddit

If you can afford a 5070 Ti and 9800x3d, you can afford $170 for a quality 1200w Platinum PSU. Don’t skimp on the most important part of the build.

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DZCreeper@reddit

You will be fine, that combo could run on a good quality 550 watt PSU. 300 watt GPU, 162 watt CPU, bit of headroom for VRM switching loss, RAM, storage, fans, etc.

https://www.techpowerup.com/gpu-specs/geforce-rtx-5070-ti.c4243

https://www.techpowerup.com/cpu-specs/ryzen-7-9800x3d.c3891

Just FYI, insufficient wattage would not lower performance, the PC would just turn off entirely at high load.

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1rkella@reddit

There is no way that a 550w PSU would be recommendable for these components...

Transient loads/power excursions would regularly be pushing it over capacity, and most likely damage the PSU over time.

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DZCreeper@reddit

The 3.0 version of the ATX standard requires the PSU handle 200% transient load for 100 microseconds.

I am not recommending a 550 watt PSU but a good quality unit would absolutely work for this hardware configuration.

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trouttwade@reddit

This is interesting, I had a 750 Corsair that couldn’t run a 5070ti and a 12700K.

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dertechie@reddit

Seriously, it’s actually kind of impressive how fast the specs people implemented a fix to the transient issue once it got into the public eye. Especially compared to the continued nonsense that is 12V 2X6.

But I’ll be hearing people fear monger about it for the next decade.

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Significant_Apple904@reddit

550W wouldn't work because of transient spikes. Even though rated at 300W, the power draw could be 350-400W for 1-20ms, and it can easily destroy a 550W PSU in an instant.

But a 750W is definitely enough.

Though personally I don't like pushing PSU close to it's limit, I like to keep peak load under 70% of its capacity, which means 750W is minimum, and 850W is where I feel comfortable.

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dertechie@reddit

Spikes weren’t destroying PSUs even on 2.x PSUs where they were a relevant talking point. They were a problem because the rapid rise in current/power made the PSU’s protections trip and shut things down.

The rating is not a point where everything goes up in smoke if exceeded by 1W. Over Power Protection doesn’t even kick in until 50-100W over the rated spec and is set to shut things down before any damage.

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DZCreeper@reddit

The 3.0 version of the ATX standard requires the PSU handle 160% transient load for 10ms, 180% for 1ms, and 200% 100 microseconds.

I am not recommending a 550 watt PSU but a good quality unit would absolutely work for this hardware configuration and have zero risk of damage.

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RockBandDood@reddit (OP)

Just FYI, insufficient wattage would not lower performance, the PC would just turn off entirely at high load.

Ha, in my uneducated brain, I thought it would somehow throttle performance, not just refuse to run the computer. That makes sense, so I could try a 750W, if it doesnt work, just return it and get a 850.

Thank you. This isnt an entire build upgrade, just upgrading mobo, cpu and power supply. Already have ddr5 and the graphics card, so i am trying to save money where I can cause this is an investment for me, need this computer to survive the hardware crisis. I already got the Ram and GPU, those are the most expensive parts right now, but want to be sure I get the rest of the build correct.

Thanks for your time

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Explosivpotato@reddit

Yeah PSUs aren’t that smart or integrated in desktop pcs. They’ll keep from exploding (generally) by just switching off when overloaded.

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DZCreeper@reddit

Yes, I would start with a 750 watt unit. Some of the top quality units start around $90.

https://pcpartpicker.com/product/yWJBD3/be-quiet-pure-power-13-m-750-w-80-gold-certified-fully-modular-atx-power-supply-bp026us

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trouttwade@reddit

Go with 850 or above. I’m only running a 5070ti and a 12700k and while every source says that’s enough, it wasn’t enough. Just jumped up to a 1000 to have the headroom.

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GT_Hades@reddit

I am on MSI mag a750gl with my 5070ti + 5700x3d

Cpu can reach 115w altho not same as 9800x3d

I think 750 was fine, but for you, 850 would be safer choice

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Utahguy69@reddit

I use a

EVGA Supernova 1600 Watt for my 9800X3D but I also have a 4090 Founder's Edition 24GB. I didn't want any issues with not enough power.

https://www.amazon.com/EVGA-Supernova-Crossfire-Warranty-120-G2-1600-X1/dp/B00MMLUIE8/ref=mp_s_a_1_5?crid=2R4I9D6P4H3A0&dib=eyJ2IjoiMSJ9.Ds8OxEkYpkBbp4Aj6lazQsqnJmyyxbF3qtG8KKR12JsScIRseTXOOW36vsCkuk_maOQt_VgCc8abUz97I0IPKJKqx_DBZl4NEXW_BQo2uGrr9AIQhbC5_6gGhEfxnd2IEUUTwdPnYLm_8Tdc44QXAImGRLsqdrjgHqtp86TUFMK4rBIcxBYTburfJo1mph8QCDAg46BylgmoKKNvv3ZR5Q.2DLffigFbfjdzAGcp8ITsXpMBRbHkWdi_JCCvMIXR-8&dib_tag=se&keywords=evga+supernova+1600&qid=1779063469&sprefix=evga+supernova+1600%2Caps%2C327&sr=8-5

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_-_Rob_-_@reddit

I have a 750w with a 9800x3d and a 5070. No issues.

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VacuousMike@reddit

I have a 5080 FE and a 7800x3D I use a 1000w power supply most power supply’s are at peak efficiency at 50% - 60% power draw

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dackling@reddit

Just for anecdotal evidence, my current PC has a 9800x3d and 5070ti, and I am using a 750w PSU and everything is just peachy.

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MilkyThing@reddit

I'm running that exact combo on a 750w psu (Corsair RMx). No issues at all. I wanted 850w as it was the same price but unfortunately they were sold out.

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Falafel-Wrapper@reddit

I have a 5090 and 9800x3d. I use a 1000w.

I use my computer 8-10 hours a day, a regular power draw during intensive gaming is close to 800w.

So yea for your build a quality 750w would be absolutely fine.

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Extreme996@reddit

850W shouldnt be much more expensive and I think its good to have headroom.

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ShallNtb@reddit

I run my 5070ti and i7 12700k on my MSI 650 gold. No issues.

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Duka65@reddit

You’ve already had good replies. But yeah, no harm getting the 850w, especially with the narrow price gap between the two. If some hefty future card comes out or whatever you’ll be fine.

My EVGA 550 G2 power supply finally got replaced this past year after 11 years of use. It saw a few different mobos and CPUs, and like 4 GPUs. Only upgraded because I made the jump to the 9070xt and 9850X3D

A good PSU is worth the investment and will last a long time.

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1rkella@reddit

A quality 750w power supply would be sufficient, but with the price difference between a 750w and 850w PSU, I'd probably just go for the higher capacity to have extra headroom.

A PSU in general isn't going to "limit" performance, as it doesn't communicate its capacity with the PC. It will either have enough capacity to run the components, or it will shut down if it's being overdrawn.

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RockBandDood@reddit (OP)

A PSU in general isn't going to "limit" performance, as it doesn't communicate its capacity with the PC. It will either have enough capacity to run the components, or it will shut down if it's being overdrawn.

I have messed around with computers for 20 years and did not know that it would just shut down if the power requirements were too high.

Thank you for that insight, and youre right, the price difference isnt a ton, but this upgrade is kinda on a quick budget, I got the RAM and GPU last year; but need a mobo, powersupply and cpu - trying to get them before the prices go bonkers because of supply chain issues around the world

Part of me is saying 'wait for the cpu sales to drop and theyll lower prices'... other part of me is saying 'they aint ever lowering prices of cpus cause they are, like nvidia, making money on their cpus in bulk for data centers"

So at the least, I wanna get the cpu immediately then look at psu and mobo afterwards

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1rkella@reddit

If you're in the US, the price difference between a quality 750w and 850w PSU is currently around $5

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AdstaOCE@reddit

850W aren't usually much more expensive, so may as well go with that. And then if you don't need CUDA you can save a lot going for the 9070XT as well.

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RockBandDood@reddit (OP)

Understood, thanks for the quick response, I appreciate it.