Question PSU advice for 3900X build?

Feb 7, 2020
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Hi everyone, new here! I hope you can help me, I'm building a new system which I haven't done in a long time, with the following parts but I'm having a hard time choosing PSU and which wattage, I hope someone can help advise me!

CPU: AMD Ryzen 9 3900X
CPU Cooler: Noctua NH-D15
Motherboard: Gigabyte X570 AORUS PRO ATX
Memory: Corsair Vengeance LPX 32 GB (2 x 16 GB) DDR4-3200
Storage: 1x Samsung 970 Evo 500 GB M.2-2280 NVME, 1x Samsung SATA SSD, 1x SATA HDD 7200RPM
Video Card: RTX 2070 SUPER 8 GB
Case: Fractal Design Define R6
Case Fan: 2x Noctua NF-A14 PWM 82.5 CFM 140 mm Fan, 1x Stock Case Fan

Estimated Wattage as shown on PCPARTPICKER: 450W

PSU's I've been looking at are Corsair RMx, Seasonic Prime Ultra Platinum and BeQuiet! Straight Power 11, looking at reviews these seem to be pretty good, I'm currently leaning towards RMx only because I already own one in another build from some years back (I can't use it as it's still being used).

My budget for PSU is about £120, I want reliability more than anything, but I'm not sure which wattage to go for. I won't game on this system, it's for 3D/2D animation/light sculpting and digital painting so I don't think I'm that likely to max out CPU+GPU at same time, I also won't overclock, so I'm not sure what's best to hit a good efficiency point.

I was going to go with 550W, but I can't help but feel it's low, would 650W be better?

Thank you so much for any help!
 
Feb 7, 2020
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Thanks! Is 750w a little too much though? I imagine much of the time the system will pull 100-300w since I mostly work in the viewports, 3D rendering will be on GPU, video rendering on CPU.

Guru3D says:
"GeForce RTX 2070 Super - On your average system we recommend a 550 Watt power supply unit."
I can afford any RMx PSU of 550/650/750 and up to 650 for Seasonic PRIME Ultra Platinum, I'm not sure how much the 3900X/2070S combo needs in the real world.

I noticed the X570 motherboards all have those extra CPU pin sockets, 8+4, is the extra +4 necessary?
 

Nemesia

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Nov 6, 2019
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Thanks! Is 750w a little too much though? I imagine much of the time the system will pull 100-300w since I mostly work in the viewports, 3D rendering will be on GPU, video rendering on CPU.

Guru3D says:


I can afford any RMx PSU of 550/650/750 and up to 650 for Seasonic PRIME Ultra Platinum, I'm not sure how much the 3900X/2070S combo needs in the real world.

I noticed the X570 motherboards all have those extra CPU pin sockets, 8+4, is the extra +4 necessary?
It's good to have headroom on the PSU. The 2070 Super recommend a 550 Watts PSU. You could possibly buy a 650 but the 750 is just 8 more euro and you have more headroom. I'd go for the 750 too.

The extra CPU power connector exist for extreme overclocking. Only use the 8. That's enough power.

All in all the specs looks fine. Nice system :)
 
Reactions: KaseyFa
Feb 7, 2020
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Thank you everyone for all the input I appreciate it!

RMx 650 and 750 are same price, there's also a white RM750x which is £10 less expensive, are those the same PSU or is the white one older? They look a little different. My case has a PSU shroud so I won't see it, it's also the Fractal Define R6 so white cables wouldn't bother me since it has white accents anyways.



Wouldn't want an older PSU though!
 
Feb 7, 2020
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Whoops, there are two white RM750x models, one is £89 (-10) and one is £115 (+15), this one looks like the black one above.



Confused!
 

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