3700x 350 watt enough?

[plaklijm]

Hey guys

I'm planning on building my super small pc in the velka 3 https://www.velkase.com/products/velka-3

I have an 3700x with an mini itx gigabyte x570 board, 32 gb of ram, and planning on buying a new graphics card. 

https://www.youtube.com/watch?v=tFmb5h1lN-w in this video he uses a 2060 mini. and im planning on buying the same 350 watt psu. but im wondering if its possible to use a rtx 2070 mini. and im planning on undervolting my cpu to get less power draw. so maybe that gives me more headroom? im asking before i buy because i dont want to end up with broken hardware or wasting my money.

and if 350 isn enough, i can buy one with higher wattage, but the problem is mostly the noise. and i can replace the fan, so if anyone has tips for that, please say. because i dont want to kill myself. but this one is much quieter out of the box.

so if anyone can help me, it will be appreciated 

 

[Firewrath9]

its gonna be a little close.

https://www.amazon.com/FSP-Supply-Platinum-Certified-FSP500-70UDPB/dp/B01AK9SPBG

something like this will have more headroom. I wouldn't swap fans becuase you might overheat, the reason why the fan is lound becuase it is moving @ thousands of RPM for better aiflow.

[plaklijm]

9 hours ago, Firewrath9 said:

its gonna be a little close.

https://www.amazon.com/FSP-Supply-Platinum-Certified-FSP500-70UDPB/dp/B01AK9SPBG

something like this will have more headroom. I wouldn't swap fans becuase you might overheat, the reason why the fan is lound becuase it is moving @ thousands of RPM for better aiflow.

Thank you, but a 2060 and a 3700x does not reach the 350 watts right. I can undervolt both my CPU and GPU for a little less power draw if that is needed. Because Linus was using a 3700x and 2060. And maybe when I undervolt the 2070? And I don't really mind if my pc is a little bit slower because of undervolting. Because simply said, an undervolted 3700x uses around 65/68 watts, and an undervolted 2070 also draws less than 200 watts. So that are the biggest draws. Maybe the motherboard uses 20 watts or so. But that could be done right?

[Man]

Wattage is just one aspect of a PSU. You also have to consider amperage. 

 

I've seen so called "500W" PSUs which provide just 25 amps on the 12 volt rails i.e 300W with a max operating temperature of just 40c. In real world scenarios, these PSUs will likely provide only about 250 watts of power, before going kaput!

 

The PSU in my old Dell Optiplex machine is rated at only 305W, yet it provides 24 amps on the 12v rails with max operating temperature of 60 degrees. Which means it's actually MUCH BETTER than the aforementioned 500W PSU, despite its meager 305W total rated output. 

 

To answer your question; you need a bare minimum of 30 amperes of 'reliable power' to run both an RTX2070 Super and a 95W CPU. But if I was you; I'd go with at least 40 amps on the 12v, just to be on the safe side. 

 

Hope it helps.

[plaklijm]

21 minutes ago, Man said:

Wattage is just one aspect of a PSU. You also have to consider amperage. 

 

I've seen so called "500W" PSUs which provide just 25 amps on the 12 volt rails i.e 300W with a max operating temperature of just 40c. In real world scenarios, these PSUs will likely provide only about 250 watts of power, before going kaput!

 

The PSU in my old Dell Optiplex machine is rated at only 305W, yet it provides 24 amps on the 12v rails with max operating temperature of 60 degrees. Which means it's actually MUCH BETTER than the aforementioned 500W PSU, despite its meager 305W total rated output. 

 

To answer your question; you need a bare minimum of 30 amperes of 'reliable power' to run both an RTX2070 Super and a 95W CPU. But if I was you; I'd go with at least 40 amps on the 12v, just to be on the safe side. 

 

Hope it helps.

So this one https://www.silverstonetek.com/product.php?pid=784

Should be enough, but not recommended? And also, it's just a 2070 with an 65w CPU so that should be okay? With little undervolting

[-The_Mask-]

No that PSU misses some connectors, it can only be used with a graphics card that requires a single 6 pins connector.

[Kilrah]

I bought this, and it has 2x 6/8pin connectors (although on the same lines): https://www.ebay.com/itm/1U-2U-Chassis-500W-1U-Flex-ATX-80-PLUS-ITX-Power-Supply-AP-MFATX50P8-New/392432849627?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

 

Runs fine with 9900K + 1070, pulling around 380W from the wall under stress test.

 

Stock fan is noisy, but I will receive a Noctua replacement today, hopefully better.

[plaklijm]

1 hour ago, -The_Mask- said:

No that PSU misses some connectors, it can only be used with a graphics card that requires a single 6 pins connector.

Ow that is not handy at all

[plaklijm]

1 hour ago, Kilrah said:

I bought this, and it has 2x 6/8pin connectors (although on the same lines): https://www.ebay.com/itm/1U-2U-Chassis-500W-1U-Flex-ATX-80-PLUS-ITX-Power-Supply-AP-MFATX50P8-New/392432849627?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

 

Runs fine with 9900K + 1070, pulling around 380W from the wall under stress test.

 

Stock fan is noisy, but I will receive a Noctua replacement today, hopefully better.

How are you going to replace it? Because it is a good option, but I don't want to kill myself when opening a PSU, so if you can share how you are going to do it, it would help a lot

[-The_Mask-]

56 minutes ago, Kilrah said:

 

Stock fan is noisy, but I will receive a Noctua replacement today, hopefully better.

Don't do it! A PSU like this needs airflow. It's noisy because the only way a small fan like this can generate some airflow is if it spins really fast. If you replace it with a Noctua which can generate enough airflow, it also will be just as noisy. If you replace it with a Noctua which can't generate enough airflow it's gonna be really dangerous. A PSU that overheads can easily kill your hardware, it can even catch fire.

[Kilrah]

Received fan. 

The stock fan does create more airflow indeed, but it vibrates like hell doing so. At same-ish airflow as the Noctua is capable of it's still the loudest thing in the room while the Noctua is basically inaudible.

For air to be cooling things it has to heat. The air coming out of the PSU was basically less than 5°C above ambient, so it means it's not doing much in the first place. Now after replacement exhaust is at 37°C once settled at 320W or so for half an hour.

So all good in my book. Some components do get hot but they're on the output side as far away from the fan as it gets and they're basically not getting much airflow in the first place becasue the air goes through the vents that are placed closer to the fan location than where they are, so fan airflow wouldn't affect them much.

 

Additional airflow from the case design once it's built into it will make things better anyway.

 

 

[seon123]

5 minutes ago, Kilrah said:

The air coming out of the PSU was basically less than 5°C above ambient, so it means it's not doing much in the first place

That's not how this works at all.