[SOLVED] RX 580 on 450wt?

[reaganbfrazier]

I have an evga 450bt and I want to run an RX 580 4gb, i5-2400, 8gb DDR3, and a regular 7.2rpm hdd. I know the amd recommendation is 500 but I saw the card for 60$ and couldn't pass it up. Thanks.

 

[Darkbreeze]

Nice that you got the card for a good price, but it will never run, at least not correctly and not for long, with that power supply.

You can drive around on four temporary tires too, but it's a bad idea and eventually something bad is likely to happen. Same thing. And eventually, could be in five minutes, or in five days.

Get a better power supply and get one that is a MINIMUM of 550w. These cards are known to easily spike over 500w when the whole system is factored in. Especially if it's a model that requires more than just a single 8 pin connector, and some of them are.

 

[reaganbfrazier]

Super weird as amd reccomends a 500 watt, and everyone else I've talked to says they over exaggerate on how much wattage you need just to play it safe. Also should mention it's the 4gb model, maybe the reason I got it so cheap.

 

[reaganbfrazier]

Nice that you got the card for a good price, but it will never run, at least not correctly and not for long, with that power supply.

You can drive around on four temporary tires too, but it's a bad idea and eventually something bad is likely to happen. Same thing. And eventually, could be in five minutes, or in five days.

Get a better power supply and get one that is a MINIMUM of 550w. These cards are known to easily spike over 500w when the whole system is factored in. Especially if it's a model that requires more than just a single 8 pin connector, and some of them are.

I'd like to say this guys calculations would be decent, and I have no intent of oc'ing any of my parts

How To - CNET

CNET editors and users share the top tech 'how to' tips and tricks with advice for getting the most out of all your gadgets.

www.cnet.com

 

[reaganbfrazier]

I'd like to say this guys calculations would be decent, and I have no intent of oc'ing any of my parts

How To - CNET

CNET editors and users share the top tech 'how to' tips and tricks with advice for getting the most out of all your gadgets.

www.cnet.com

ofc the tdp of the i5-2400 is a bit more but it's still under the total wattage

 

[Darkbreeze]

Yes, the 4GB models will pretty much all be single 8 pin connectors, but the fact is there are really VERY few GOOD 500w power supplies on the market today. Anything of any real quality is going to be 550w, 650w, etc. Most 500w, 600w, 700w models are based on very old platforms and any of the OLD platforms like that that WERE good have been phased out long ago, so if you see a unit that is 500, 600 or 700w, it is PROBABLY not a quality unit. Obviously, knowing the model would be required before determining that for certain, but what is for certain is that 450w is not sufficient.

Plus, those power requirement recommendations are generally INITIAL recommendations. Practically all AMD cards since the HD series cards have been known to moderately increase in power draw as the driver platform matures. In some cases, more than moderately.

There is no way anybody with any sense would approve or recommend the use of a 450w unit regardless of how good it was, with an RX 580. And that BT unit, while not a fire bomb, isn't that good.

 

[Darkbreeze]

I'd like to say this guys calculations would be decent, and I have no intent of oc'ing any of my parts

I'd say the manufacturers calculations, and those given as a result of EXTENSIVE testing at RealHardTechX, are far closer to reality than what some unknown dude suggests, but obviously you can do what you want. Clearly you intended to from the start so I'm not sure why you even bothered to ask if you already knew what you were going to do other than you simply wanted somebody to agree with you. Not going to happen on this forum.

http://www.realhardtechx.com/index_archivos/Page362.htm

 

[reaganbfrazier]

bruh just wanted to know if my computer was going to spontaneously combust if I used it for a couple weeks Jesus

 

[reaganbfrazier]

Sorry for coming off as ignorant, if I limit power consumption in msi afterburner, can I possibly use this psu for a little while until I can buy a new 550wt. Thanks man.

 

[Darkbreeze]

Yes, it will. Maybe. Ok, probably not "combust", but an underpowered, lower quality PSU can definitely cause some damage if you're pulling more than it can accomodate and it's protections fail. Having quality protections is generally a feature that most obviously separates good quality units from mediocre or budget models so while it might work, it is definitely a potential risk that you take in doing so.

Personally, if you value your hardware INCLUDING the power supply, which is fine for use with some other system you might have or to resell and get some of your costs back, I wouldn't risk it. No sense damaging a perfectly good PSU or any other hardware just to avoid spending 50-60 bucks on a suitable unit.

While it is unlikely that BT unit is going to do anything spectacular or damage other hardware, it is certainly a potential outcome. It's a VERY budget oriented model. Nobody would call that a quality unit and keep a straight face.

 

[reaganbfrazier]

So if I were to set my power to 80% in afterburner, I would in theory be ok for a temporary amount of time.

 

[Darkbreeze]

It actually has very little to do with any setting you could ever manipulate. Most systems will briefly use peak power for both CPU and GPU cards at startup, well before your Afterburner settings could have any effect on power limits. This could have a variety of effects including putting the PSU in a usage scenario that dramatically increases ripple or amplifies voltage regulation tolerances, both of which could have an effect not only on the graphics card but the motherboard, CPU, drives, etc. as well.

You can certainly try it though. You might not have any problems, in the short term. I would certainly not recommend using it like that for very long though. Well, actually I wouldn't "recommend" doing it at ALL, but if you're GOING to do it, then I WOULD recommend that it be for as short a time as possible.

If this were a 450w Seasonic Focus or Corsair SF, or even something like an FSP Hydro X unit, I wouldn't be terribly worried about it because those units can likely supply moderately higher outputs than they are rated for, temporarily, but that BT unit is probably fully at the extent of it's capabilities for the actual rating which it lists.