Is RM650X (V1) stable enough for this build?

[Guest]

So the situation is that my rig has a Corsair RM650X (V1, not V2. It was bought in 2017.) and my girlfriend uses a BitFenix Whisper M 750W. We want to add custom replacement cables to her rig but CableMod hasn't tested their cables on BitFenix units so it feels too risky. My idea was that we could simply swap PSUs, but I've been told it's recommended to use a PSU that's AT LEAST 100W more than your expected wattage. Now PCPartPicker says her build is about 469W, other calculators say it's up to 530W. She doesn't overclock her CPU or GPU, actually has the GPU undervolted to 1900mhz 1000mv to reduce heat.

 

I'm just a bit paranoid my PSU wouldn't be good enough, so I'm asking for advice here. Here is her rig (without the PSU): 

PCPartPicker Part List

Type	Item	Price
CPU	AMD Ryzen 5 3600X 3.8 GHz 6-Core Processor	$199.99 @ Amazon
CPU Cooler	Corsair H100i RGB PLATINUM 75 CFM Liquid CPU Cooler	$159.99 @ Best Buy
Motherboard	Asus ROG STRIX B450-F GAMING ATX AM4 Motherboard	$129.99 @ Best Buy
Memory	Corsair Vengeance RGB Pro 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory	$84.99 @ Amazon
Storage	Corsair MP510 480 GB M.2-2280 NVME Solid State Drive	$74.98 @ Amazon
Storage	Corsair MP510 960 GB M.2-2280 NVME Solid State Drive	$134.99 @ Amazon
Video Card	Asus Radeon RX 5700 XT 8 GB STRIX Gaming OC Video Card	$449.99 @ B&H
Case	Lian Li PC-O11 Dynamic ATX Full Tower Case	$139.99 @ B&H
Case Fan	Corsair HD120 RGB 54.4 CFM 120 mm Fans 3-Pack
Case Fan	Corsair HD120 RGB 54.4 CFM 120 mm Fans 3-Pack
Monitor	Samsung LC27F398FWNXZA 27.0" 1920x1080 60 Hz Monitor	$179.99 @ Amazon
Monitor	Samsung C27JG50 27.0" 2560x1440 144 Hz Monitor
Keyboard	Corsair K70 RGB RAPIDFIRE Wired Gaming Keyboard	$500.00 @ Amazon
Mouse	Corsair SCIMITAR PRO RGB Wired Optical Mouse	$79.99 @ Newegg
Headphones	Corsair VOID PRO RGB (White/Black) 7.1 Channel Headset
Custom	Corsair Fan Controller Commander Pro (CL-9011110-WW)	$72.05 @ Amazon
Custom	Corsair Vengeance RGB Pro Light Enhancement Kit - Black PC Memory CMWLEKIT2	$38.99 @ Amazon
Custom	RGB Strip LED Lights for Corsair iCUE Commander PRO, Smart RGB Lighting, Individually Addressable RGB LED Strips (4 x 40cm)	$33.99 @ Amazon
	Prices include shipping, taxes, rebates, and discounts
	Total	$2279.92
	Generated by PCPartPicker 2020-07-30 14:26 EDT-0400

On top of that she usually has a drawing tablet plugged in and charges some devices using USB, which I'm aware doesn't draw a lot of power but I just wanna mention it.

[Haro]

2 minutes ago, RonnyDouglas said:

been told it's recommended to use a PSU that's AT LEAST 100W more than your expected wattage

No not really. If the PSU can provide the advertised wattage then it's fine. And your system doesn't consume more than 350ish watts at worst. 

The rmx will be more than enough. 

[Guest]

You're nowhere near stressing that RM650x.

 

[.Apex.]

That PC won't be anywhere near 500W, it's more like 300-350W at best, the calculators aren't accurate and they make a lot of safe assumptions about a lot of components, it would never recommend a PSU lower than what your system needs, but you have to keep in mind that their recommendation is already inflated.

 

Also even if it is at 500W that still won't stress the RM650X in any way, that PSU can handle the full 650W load with no issues.

[Guest]

What a relief. Thanks for the answers guys!