I have a PC with an Intel Xeon 2640 v3 that uses about 72W at maximum load (I tested it with a stress test until it stabilized). I'm considering getting a second-hand 3070 for around 170€ to use on my living room TV at 2K/4K 60Hz. I know there will be some performance bottleneck, but I'm mainly looking for good resolution rather than high FPS.
My main concern is whether my PSU, a Be Quiet! 500W from eight years ago, can handle the additional load. Doing the math, it seems like the total would be around 350W (72W for the CPU plus 220W for the GPU plus another 60W for other components). I've also thought about undervolting the GPU to save some power.
One more thing that's bothering me is that my PSU has a single 12V 6+2 cable split into two outlets, which I understand isn't ideal. I'm looking for some advice on whether this setup would be safe and reliable or if I'm pushing my luck here.
4 Answers
If you're not planning to push the components hard, you might be okay, especially with older parts. I'd suggest considering alternatives though. For instance, GPUs from the Radeon series and some newer models can offer decent performance with lower power consumption, which would keep you within safe limits.
I've got a somewhat similar setup with an undervolted 2080 Ti and a 450W PSU that I've been using for years, so I get what you're going for. However, while your Be Quiet! PSU is probably decent quality, I'd be cautious. Even if it seems okay now, pushing it with a powerful GPU like the 3070 could lead to problems down the line. It's tricky because while it could technically work, if something goes wrong, it could really damage your system.
Totally understand your reluctance. You could play it safe and look into getting a new PSU later on if you really get into gaming.
Yeah, I think it's a bad idea to push that PSU. Even though undervolting helps, I just wouldn’t risk such an old power supply with a new GPU. Sticking to the limits is key for the PSU because if it fails, it could damage everything else. Online PSU calculators can help give you a better idea, but I’d err on the side of caution for your build.
You make a good point about potential risks, I'll definitely check out the calculators.
I’d say you're on the edge but if you're careful, it could work. You'd just be operating at the limit. That split connector isn't ideal, sure, but many systems run fine that way; just make sure to keep an eye on temps and power usage. Also, some 3070s only need one 8-pin, so if yours is one of them, you should be fine at lower loads. Just remember, spikes can reach up to 279W!
Wow, I didn’t know about those spikes being so high! Thanks for the heads up.
I do have my eye on a 6700 XT as well; good to know it's an option.