[SOLVED] Corsair Rm650x good enough for my system

[btsv]

Hello,

I bought an amd ryzen 9 3900x and a gigabyte rtx3070 ti OC. Is the corsair rm650x 80+ gold good enough for this system ?

Thanks.

 

[Bazzy 505]

no it isn't, minimum recommended PSU for RTX3070Ti is 750W

 

[hotaru.hino]

I would argue yes, for the following reasons:

• Tom's Hardware measured a power draw of around 280-290W (https://www.tomshardware.com/news/nvidia-geforce-rtx-3070-ti-review)
• They also measured a power draw of around 140W for the Ryzen 9 3900X if using a PBO profile (https://www.tomshardware.com/reviews/ryzen-9-3900x-7-3700x-review,6214-3.html)
• Give or take add 50W for the rest of the system

So far we're at ~500W total. Even if this all comes from the 12V rail, the RM650X can supply practically 650W through the 12V rail. And also in practice, it may never get this bad. For instance, I have a Ryzen 5600X with a RTX 2070 Super. Power consumption floats around 300-320W from the wall when gaming if I leave everything at defaults. But I have my system tuned for efficiency so it really floats around 240W. And measuring my builds for the past decade, I almost never trip over 350W and they tend to float around 200-240W.

 

[Bazzy 505]

I would argue yes, for the following reasons:

• Tom's Hardware measured a power draw of around 280-290W (https://www.tomshardware.com/news/nvidia-geforce-rtx-3070-ti-review)
• They also measured a power draw of around 140W for the Ryzen 9 3900X if using a PBO profile (https://www.tomshardware.com/reviews/ryzen-9-3900x-7-3700x-review,6214-3.html)
• Give or take add 50W for the rest of the system

So far we're at ~500W total. Even if this all comes from the 12V rail, the RM650X can supply practically 650W through the 12V rail. And also in practice, it may never get this bad. For instance, I have a Ryzen 5600X with a RTX 2070 Super. Power consumption floats around 300-320W from the wall when gaming if I leave everything at defaults. But I have my system tuned for efficiency so it really floats around 240W. And measuring my builds for the past decade, I almost never trip over 350W and they tend to float around 200-240W.

But you should also account for PSU age, and transient loads behavior.
This is the very reason why NVIDIA recommends 650W for 3070 and 750W for 3070ti respectivelly.

 

[sizzling]

It should be fine. I’m running a 3700X (PBO on) and 3080 Gigabyte Gaming OC with a 650w Seasonic Prime Ultra Platinum. I have been running this since last September with zero issues. With the 3080 NVidia clearly stated their 750w recommendation was when using a 10900k, a cpu capable of taking over 120w more than my 3700x. There are higher wattage PSU’s that struggle with these gpu’s but from what I read that is due to their transient response performance.

You have a slightly higher wattage cpu but lower wattage gpu. I know it’s not the most accurate but my smart plug tells me my system when gaming averages at about 450w and the peak when stress testing was 546w. These figures are at the wall so actual wattage is a few % lower. This indicates I still have a decent amount of headroom which was inline with my estimates I did at the time.

 

[sizzling]

But you should also account for PSU age, and transient loads behavior.
This is the very reason why NVIDIA recommends 650W for 3070 and 750W for 3070ti respectivelly.

NVidia do state that their estimate is based on using an i9 10900k and acknowledge other setups may have a lower requirement, they are being cautious. Here it says

“4 - Requirement is made based on PC configured with an Intel Core i9-10900K processor. A lower power rating may work depending on system configuration.”

Taken from https://www.nvidia.com/en-gb/geforce/graphics-cards/30-series/rtx-3070-3070ti/

 

[hotaru.hino]

But you should also account for PSU age, and transient loads behavior.
This is the very reason why NVIDIA recommends 650W for 3070 and 750W for 3070ti respectivelly.

They recommend higher wattage PSUs because they're being conservative. They know random people and system builders looking to cheap out wherever possible are going to stuff substandard PSUs in their computers.

With regards to transient load behavior, the RM650X is fine.

Also regarding age, I expect a power supply to deliver within its specs with minimal deviation for at least its warranty period, which Corsair gives 5 years for it.