Is a 750W PSU Enough for RTX 4070 Ti + Ryzen 9 7900X? Need help with my build!
Posted by AdAcceptable957@reddit | buildapc | View on Reddit | 10 comments
Hey fellow PC enthusiasts, I’ve been working on my dream PC build and could use your expertise. I’ve put together the following components:
https://pcpartpicker.com/list/Qpgb28
Initially, I planned to go with the Ryzen 7 7700X, but I’ve stumbled upon a deal for the Ryzen 9 7900X. I’m tempted to make the upgrade, but I’m concerned that my 750W PSU might not cut it.
I’ve used the OuterVision power supply calculator, and it suggests that my PSU should be sufficient. However, I’ve seen from YouTube builds with similar setups that use 850W PSUs. Could you offer your insights and advice on whether my 750W PSU is enough?
Edit: Added the PCPartPicker
thesuncarl@reddit
i know its been 1 year but the 4070 ti allows 3 PCIes right. and the 700 watt psu has only 2. are you using it with only 2. if so hows the build? cuz im currently having issues with mine.
my build:
850 watt psu that also has only 2 PCIes
4070 ti
ryzen 9 7950x
Rog strix X670E-E motherboard
corsair iCUE H150i
and 6 fans. 92mm i think. not sure
the recommended watt was 700
it shuts down with no blue screen. just suddenly everything turns off and restarts. the windows error says kernel-power with an event id 41 task 63. meaning it failed due to weak power.
im thinking of getting a 1000 watt psu and hoping it fixes the issue
Ansar6211-@reddit
Hey, did changing the PSU fix your problem? I'm having similar issues and recently bought a 1000 watt PSU to try and fix it.. I'm still only utilizing 2 PCIes and want to see if that worked out with you or if I should use 3
thesuncarl@reddit
I was able to fix the issue… after 1 and a half years. almost drove me to insanity. yup im using it with 2 PCIes.
what happened was the c670e-e motherboards has c-state and heard it in a forum that it was a bit buggy. c- state is a power saving mode which turns off unused components.
so updated the bios which no longer crashed the whole pc but still the apps/games got crashed. so i disabled c-state and now everything works fine.
Ansar6211-@reddit
Hmm I'll try that if I crash again, thanks for the explanation and im glad you got it fixed! Im having my monitors turning off and then fans ramp up usually when I play dx12 games. Been trying to fix it for a couple of months and is driving me insane lol
Thanks!
AdAcceptable957@reddit (OP)
I’m using this PSU, and here’s my build: GPU: RTX 4070 Ti CPU: Ryzen 7 7700X Motherboard: GIGABYTE X670 Aorus Elite AX Cooler: NZXT Kraken 280 Fans: 6 ARCTIC P12 PWM PST + 4 ARCTIC P14 PWM PST RAM: G.SKILL Trident Z5 Neo RGB Series (AMD Expo) DDR5, 32GB (6000 MT/s, CL30-38-38-96)
I’m not sure if my PSU is sufficient, but I’ve been running this build for about a year and a half without any issues so far.
Low-Blackberry-9065@reddit
The 7700x is slightly faster than the 7900x in gaming. Get the cheaper of the 2, the perf is very very close.
Better yet get a 7800x3d if you can afford it as it's quite a bit faster than either.
You don't need an AIO for any of these cpus. A good air cooler like the peerless will be enough and costs much less.
A 750w psu will be enough for any of them.
The 4070ti is not a great buy at typical prices. It's ~20% faster than a 4070 and costs ~40% more.
Either get a 4070 or a 7900xt (it's 10% faster than the TI).
Edit: put your build in pcpartpicker localized to your area
StillBeingAFailure@reddit
I'm using the 7900X because I basically got it half-price. My GPU is the 4070 Super (not Ti) and I'm planning on sticking another GPU into my system. However, I might not do so. My PSU is currently 1400W platinum (it was from a company promotion so I got it for free), however, I am thinking of putting a UPS on my system, which would be only 800W. I could go for a 2000W UPS, but it's like 13x the price ($200 for 800W to $2600 for 2000W) In that case, I might go for an 800W UPS and take out my secondary GPU. With the current system I've described (just CPU and GPU), plus an AIO, 4 M.2 SSDs, 3 SATA SSDs, an external HDD, and potentially other power consumption from plugged-in devices, would I need to go for the 2000W UPS or could I go for the lower 800W one? I'm trying to stay with lithium ion only, and I was trying to find something 1500W or over. so I could have an extra 100W for things like my monitor. Realistically, I could just buy another UPS for the monitor too. What do you think?
Low-Blackberry-9065@reddit
4070s is a <300w GPU.
The 7900x can go a bit over 150w if under heavy allcore workloads so 2 gpus + cpu would already put you very close to the 800w limit of the UPS, with the other parts and the efficiency loss of the PSU it will be over the limit under heavy load. You'd need one hell of an ups to resist more than a few seconds of such power draw (I'm talking about capacity, different from the max output power).
There is no benefit to gaming in having 2 GPUs.
StillBeingAFailure@reddit
So yes, I wouldn't really care about capacity, I just need it to be able to supply up to 2000W in case of emergencies so I can shut off the desktop and switch to devices with internal batteries. If there's still enough power left in the UPS, I could maybe even use it to power the monitor and plug my laptop into it. If you happen to find a recommendation that maybe I haven't found, let me know though. Thanks!
StillBeingAFailure@reddit
The second GPU is used for running AI models, and it's a bit older. However, the computer's measured power draw at full load in LM Studio (AI software) is about 1000-1100W, so it uses quite a lot of power. Luckily, I found some 1500W, 1800W, and 2000W lithium battery UPS units that I'm looking into. Thanks for the concern though! Also, I am only looking to have enough power at that load for like maybe 1-5 minutes. My goal would be to put the PC into a low power state or even shut it off during that time. Desktops aren't exactly meant to be used with batteries. If you need a battery-powered device, that's what laptops are for. They basically already have a UPS unit in them, and the one I'm using right now is pretty high-end. Although it's nowhere near my desktop's power level, in a power outage, I would be very comfortable using it on pretty much anything gaming or coding related, and the battery lasts up to 10 hours depending on my use-case. If I plugged the laptop into the remaining UPS's power, I would probably have enough power for a few days of usage on the lowest settings, maybe one day if I put the laptop to full load. That's just for the specific unit I'm looking at, and I'm assuming my laptop uses 7W in the lowest possible state, 30W in a medium state, and 240W at full load (these have all been accurately measured by my power supply unit that displays wattage).