A4-H2O SFF Build PSU Question

[Danger198]

Budget (including currency):NA

Country: United States

Games, programs or workloads that it will be used for: Primary use workstation for K3s, secondary use 2k gaming on 165Hz monitor

Other details: I currently have a Lian Li 750w SFX Gold PSU, I’m upgrading my graphics card tomorrow and am unsure if I should also upgrade my power supply. Let me know your thoughts… Also, I’m not using custom length cables for anything so everything is an extremely tight fit.

CPU: 7800x3d

GPU: Upgrading to 3090Ti

CPU Cooler: MSI Mag Coreliquid 240mm AIO Cooler

Motherboard: MSI 650I Mini ITX

PSU: Lian Li 750w SFX Gold

RAM: G.Skill DDR5-6000 32GB

 

[IzzMazy]

I mean technically you are under NVIDIAs recommendation by 100 watts. And even then most people would recommend a 1000 watt supply. So most definitely yes.

[Danger198]

2 minutes ago, IzzMazy said:

I mean technically you are under NVIDIAs recommendation by 100 watts. And even then most people would recommend a 1000 watt supply. So most definitely yes.

Ok thanks, what are my best options?

[IzzMazy]

7 minutes ago, Danger198 said:

Ok thanks, what are my best options?

Typically I am diehard EVGA so I would 100% recommend one of their 1000 watt supplies. Since you have an sfx build I am gonna go out on a limb and assume that you are limited to SFX power supplies so my next best recommendation, and as it appears, only real option, would be the Corsair SF1000L.

[Danger198]

17 minutes ago, IzzMazy said:

Typically I am diehard EVGA so I would 100% recommend one of their 1000 watt supplies. Since you have an sfx build I am gonna go out on a limb and assume that you are limited to SFX power supplies so my next best recommendation, and as it appears, only real option, would be the Corsair SF1000L.

Realistically I’m not sure that -L would fit into my build without custom length cables, are there any options that you know of that are true SFX? The case I’m using is only 11L. This reddit post says it’s too tight of a fit without custom cables: 

[IzzMazy]

9 minutes ago, Danger198 said:

Realistically I’m not sure that -L would fit into my build without custom length cables, are there any options that you know of that are true SFX? The case I’m using is only 11L. This reddit post says it’s too tight of a fit without custom cables: 

It looks like corsair has a non -L variant https://www.corsair.com/us/en/p/psu/cp-9020257-na/sf-series-sf1000-fully-modular-80-plus-platinum-sfx-power-supply-cp-9020257-na

[leclod]

You could also (try to) keep your psu and undervolt your gpu.

I just reduced my 3070 to 160W (while loosing some perf, but that's my choice)

Edited August 10 by leclod

[Blue4130]

2 hours ago, IzzMazy said:

I mean technically you are under NVIDIAs recommendation by 100 watts. And even then most people would recommend a 1000 watt supply. So most definitely yes.

They make that recommendation based on a system with a 10900k. That uses double what a 7800x3d uses.

2 hours ago, Danger198 said:

CPU: 7800x3d

GPU: Upgrading to 3090Ti

CPU Cooler: MSI Mag Coreliquid 240mm AIO Cooler

Motherboard: MSI 650I Mini ITX

PSU: Lian Li 750w SFX Gold

RAM: G.Skill DDR5-6000 32GB

 

Using techpowerup reviews as a base, you could likely sneak by, especially if you undervolt a tad.

7800x3d - 77W stock, 91w with PBO

3090 - 383w for founders edition (igors lab got down to 285w under load with an asus tuf undervolted)

 

Take this as grain of salt, but with tweaking, you could keep using what you have.

 

[Danger198]

7 hours ago, leclod said:

You could also (try to) keep your psu and undervolt your gpu.

I just reduced my 3070 to 160W (while loosing some perf, but that's my choice)

 

7 hours ago, Blue4130 said:

They make that recommendation based on a system with a 10900k. That uses double what a 7800x3d uses.

Using techpowerup reviews as a base, you could likely sneak by, especially if you undervolt a tad.

7800x3d - 77W stock, 91w with PBO

3090 - 383w for founders edition (igors lab got down to 285w under load with an asus tuf undervolted)

 

Take this as grain of salt, but with tweaking, you could keep using what you have.

 

Thank you guys! These are the answers I was looking for. I knew that the 7800x3d is one of the lowest power draw CPUs and that undervolting the GPU is possible in this situation just wasn’t certain. Definitely going to try and make this PS work.