I just built a new PC with 9800x3D CPU and 9070 with some SSD, HDD and fans. I am still using my 10 year old corsair RM750i. it works fine so far. Do I need to buy a bigger PSU. My mother has 8+4 pin power connector I only got 1x8 pin. and the GPU has the new 12VHPWR port and I am using 2x8pin.
I don't overclock, is it OK to continue to use my old PSU
Thanks. I haven't gotten any switch off. If I got one, I will buy a new psu. I only did one hardware test and it was fine. The game I am playing on the GPU only draws 80w.
The main issue is for a new PSU I need to redo all the cable. that's the main issue that I don't want to change. And I saw the recent NZXT PSU deal then I thought maybe worth buy a new one. But if I don't need a new one I saved even more
I'm still using an AX860 from 2013 so age isn't an issue.
PSU's absolutely wear with time. Capacitors wear, its ability to deliver stable power wears, they get less stable.
I get what you're saying that age isn't necessarily an indicator, but age is definitely an issue. Even at low power usage the PSU is nowhere near as good as when it was new. The rating it had at new probably doesn't apply anymore.
It's one of those things where a PSU is great until it goes pop, then you just hope it doesn't take anything important with it.
pcpartpicker shows my build only need about 600w
This part list is private.
Be careful with PC Parts picker and double check everything it spits out. I spent a fair bit of time with it recently and the accuracy of the information in their database is not all that great.
@RichardF89: I'm not an expert on memory power usage, but I'd be very surprised if 100W was correct. With that kind of power dissipation you'd need a fan on the two modules.
It's likely to be somewhere in the 10W ~ 20W range, if you are really pushing the system.
I have 96GB (2 x 48GB) DDR5-5600 modules in my system and they are luke warm to the touch. The built in temp sensor on the modules reports 38C. The total power draw of my system, with a Ryzen 7, 2 x 10GbE RJ45 active, 4 x Noctua fans, LSI SAS9211-8i, 2 x SATA SSDs and 12 x SATA WD Red Pro HDDs is 80W under light load and can spike to 150W under very heavy load. That's measured at the socket. So, there's no way that the memory could ever draw anywhere near 100W.
@RichardF89: I'm already thinking about adding another two 26TB drives, but sitting on the fence in case something with larger capacity & CMR becomes available.
Do I Need to Buy a New PSU?
No.
Bigger PSU? No
That said, I would not run a brand new mb and cpu and GPU off a 10 year old PSU
YMMV
Your Milo may vanish?
in terms of power requirement, no replacement needed.
in terms of missing 4pin on CPU, not required either. you can just leave it not plugged in.
8Pin CPU power = 4 positive + 4 negative wires, with standard 18AWG wire, they easily achieve 8Amps per wire. 4 wire * 8 Amp * 12 Volt = 384 watt,
There's a lot of headroom running just 8 pin, your 9800x3D draws no where near 300w.
thanks
I would have concerns running the 12V connector… they’re risky as is, but adding an 8pin>12V converter adds unnecessary risk. Personally I’d be going a new PSU with 12V connection.
Just make sure to completely change all the old cables out. I know it can be a pain but better safe than sorry.
I assume when you said 12v (voltage), you actually meant new new 12pins GPU power connector (12vHPWR). Because the GPU 8pin cable is on 12volt anyway.
The issue with the new 12vHPWR (12-pin GPU cable) is that it’s hard to fully seat the connector.
If it isn’t firmly plugged in, some pins won’t make contact, forcing the load onto fewer wires. This can double—or in the worst case,6 times the current load, on a single wire, causing the connector overheating and melting.
The problem isn’t the 8pin to 12pin adapter, but the 12vHPWR connector’s poor fit and the lack of a GPU-side check to block power when the plug isn’t secure.
You are correct, that is what I meant. I agree the problem isn’t the adapter it’s the connector itself. I personally wouldn’t want to be using that connector at all (and I didn’t when I bought my 9070XT) but on top of that I prefer not to use adapters in general. Old mate is using a weak connector with an adapter. At least fix one potential point of issue, if you can’t fix the main.
@RichardF89
The Corsair RM750-i is a top-tier A+ rated power supply. See here
I'd keep using it for as long as the system is trouble free. Buying a new power supply that is as good as what you have will require a bit of homework (use the above spreadhseet and only buy A+ PSUs) and a lot of dollars.
thanks
I'm still using an AX860 from 2013 so age isn't an issue.
You'll be fine with a 750W for power. The question is how well it manages power spikes. If you get frequent switch offs, then replace it. If you have the budget to do so now, then always better.