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Would an 80+ Gold 650W PSU run two 770/280x's?

Tacitus
By Tacitus
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Posted

Hey everyone, so the title is in the question:

 

As for the rest of the planned specs I'm looking at a locked i5, an SSD, HDD, 8GB RAM.

 

I'm currently only buying one GPU but intend to buy a second whenever the respective manufacturers' next generation of cards come along. This solution is better for me for long-term performance because as it stands I cannot afford to invest in a single, better GPU, before people suggest that :P

 

So, would it be fine?

 

Cheers

 

Chris

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No, it's not enough wattage.

 

I suggest a strong 850W+ 80+ Gold PSU if you don't want it to be loud or hot, but if you are fine with that a 750W is the minimum.

Main Rig: CPU: AMD Ryzen 7 5800X | RAM: 32GB (2x16GB) KLEVV CRAS XR RGB DDR4-3600 | Motherboard: Gigabyte B550I AORUS PRO AX | Storage: 512GB SKHynix PC401, 1TB Samsung 970 EVO Plus, 2x Micron 1100 256GB SATA SSDs | GPU: EVGA RTX 3080 FTW3 Ultra 10GB | Cooling: ThermalTake Floe 280mm w/ be quiet! Pure Wings 3 | Case: Sliger SM580 (Black) | PSU: Lian Li SP 850W

 

Server: CPU: AMD Ryzen 3 3100 | RAM: 32GB (2x16GB) Crucial DDR4 Pro | Motherboard: ASUS PRIME B550-PLUS AC-HES | Storage: 128GB Samsung PM961, 4TB Seagate IronWolf | GPU: AMD FirePro WX 3100 | Cooling: EK-AIO Elite 360 D-RGB | Case: Corsair 5000D Airflow (White) | PSU: Seasonic Focus GM-850

 

Miscellaneous: Dell Optiplex 7060 Micro (i5-8500T/16GB/512GB), Lenovo ThinkCentre M715q Tiny (R5 2400GE/16GB/256GB), Dell Optiplex 7040 SFF (i5-6400/8GB/128GB)

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After conducting research, I have to conclude with a no; it would be a big push. I'd go for at least 700-750w.

Compatible with Windows 95

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No, it's not enough wattage.

 

I suggest a strong 850W+ 80+ Gold PSU if you don't want it to be loud or hot, but if you are fine with that a 750W is the minimum.

 

PC Partpicker estimates 618W, are you really saying they are that wildly inaccurate?

 

I'm also not entirely convinced since most people say a decent 500W PSU suffices for a single-card build, so I doubt a second one will take another 350W

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PC Partpicker estimates 618W, are you really saying they are that wildly inaccurate?

 

I'm also not entirely convinced since most people say a decent 500W PSU suffices for a single-card build, so I doubt a second one will take another 350W

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It's doable and has been done.

Going with a 750w is probably better though--at least for the 280x's.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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No, it's not enough wattage.

 

I suggest a strong 850W+ 80+ Gold PSU if you don't want it to be loud or hot, but if you are fine with that a 750W is the minimum.

 

PC Partpicker estimates 618W, are you really saying they are that wildly inaccurate?

 

I'm also not entirely convinced since most people say a decent 500W PSU suffices for a single-card build, so I doubt a second one will take another 350W

 

Though you both are probably right, I do feel I'm pushing it  a bit and not leaving room for OCing the GPUs. I should probably just man up and spend an extra £15 on the PSU for some more Watts :(

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It's doable and has been done.

Going with a 750w is probably better though--at least for the 280x's.

 

Thanks for that. I take it what I said about the OCing of the GPU's is probably where the problem lies?

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PC Partpicker estimates 618W, are you really saying they are that wildly inaccurate?

 

I'm also not entirely convinced since most people say a decent 500W PSU suffices for a single-card build, so I doubt a second one will take another 350W

I am, yes.

 

PSU calculators aren't always accurate. They can and will over and undercompensate for certain hardware. You want headroom. Running a supply "balls to the wall" can only shorten it's life, and again, the PSU will get hot. Not warm, hot. I have a Cooler Master Silent Pro M 700W, and when I ran my rig plus an 8800 GTX on it, it got hot. eXtreme PSU Calculator "claims" that the setup would only run about 621W and yet it ran pretty hot. And the Silent Pro M is a very solid unit. It's an extra 15 quid, and it will better prepare you for higher power output cards. 

Main Rig: CPU: AMD Ryzen 7 5800X | RAM: 32GB (2x16GB) KLEVV CRAS XR RGB DDR4-3600 | Motherboard: Gigabyte B550I AORUS PRO AX | Storage: 512GB SKHynix PC401, 1TB Samsung 970 EVO Plus, 2x Micron 1100 256GB SATA SSDs | GPU: EVGA RTX 3080 FTW3 Ultra 10GB | Cooling: ThermalTake Floe 280mm w/ be quiet! Pure Wings 3 | Case: Sliger SM580 (Black) | PSU: Lian Li SP 850W

 

Server: CPU: AMD Ryzen 3 3100 | RAM: 32GB (2x16GB) Crucial DDR4 Pro | Motherboard: ASUS PRIME B550-PLUS AC-HES | Storage: 128GB Samsung PM961, 4TB Seagate IronWolf | GPU: AMD FirePro WX 3100 | Cooling: EK-AIO Elite 360 D-RGB | Case: Corsair 5000D Airflow (White) | PSU: Seasonic Focus GM-850

 

Miscellaneous: Dell Optiplex 7060 Micro (i5-8500T/16GB/512GB), Lenovo ThinkCentre M715q Tiny (R5 2400GE/16GB/256GB), Dell Optiplex 7040 SFF (i5-6400/8GB/128GB)

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You can, just it would be safer to go with a 750 watt gold.

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I am, yes.

 

PSU calculators aren't always accurate. They can and will over and undercompensate for certain hardware. You want headroom. Running a supply "balls to the wall" can only shorten it's life, and again, the PSU will get hot. Not warm, hot. I have a Cooler Master Silent Pro M 700W, and when I ran my rig plus an 8800 GTX on it, it got hot. eXtreme PSU Calculator "claims" that the setup would only run about 621W and yet it ran pretty hot. And the Silent Pro M is a very solid unit. It's 15 quid, and it will better prepare you for higher power output cards. 

 

You sure you're on top of your statistics, that PSU definitely isn't £15 :P

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You sure you're on top of your statistics, that PSU definitely isn't £15 :P

It's a separate sentence. :D Meaning that 15 extra quid isn't much to part with for a higher wattage PSU.

Main Rig: CPU: AMD Ryzen 7 5800X | RAM: 32GB (2x16GB) KLEVV CRAS XR RGB DDR4-3600 | Motherboard: Gigabyte B550I AORUS PRO AX | Storage: 512GB SKHynix PC401, 1TB Samsung 970 EVO Plus, 2x Micron 1100 256GB SATA SSDs | GPU: EVGA RTX 3080 FTW3 Ultra 10GB | Cooling: ThermalTake Floe 280mm w/ be quiet! Pure Wings 3 | Case: Sliger SM580 (Black) | PSU: Lian Li SP 850W

 

Server: CPU: AMD Ryzen 3 3100 | RAM: 32GB (2x16GB) Crucial DDR4 Pro | Motherboard: ASUS PRIME B550-PLUS AC-HES | Storage: 128GB Samsung PM961, 4TB Seagate IronWolf | GPU: AMD FirePro WX 3100 | Cooling: EK-AIO Elite 360 D-RGB | Case: Corsair 5000D Airflow (White) | PSU: Seasonic Focus GM-850

 

Miscellaneous: Dell Optiplex 7060 Micro (i5-8500T/16GB/512GB), Lenovo ThinkCentre M715q Tiny (R5 2400GE/16GB/256GB), Dell Optiplex 7040 SFF (i5-6400/8GB/128GB)

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It's a separate sentence. :D Meaning that 15 extra quid isn't much to part with for a higher wattage PSU.

 

Oh sorry, I mistook the full stop for a comma. My bad :P

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It depends what you do with the cards, if youre planning to throw a custom bios at it and push it to extreme levels when mining well yeah then a 650W won't be enough but just for gaming with the default settings/bios then yeah sure. I wouldn't do prime95 + furmark though

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First, go to Cooler Masters PSU calculator: Link. Now that you get the wattage of your total system you can then determine what PSU you will need. Do not forget about the 60% efficiency curve so you won't use more power and waste it. For example a 650W PSU x(times) 60% = 390W for the best efficiency.

 

This website is pretty close to what is calculated  with my Kill-A-Watt meter just about +- 15 watts

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Thanks for that. I take it what I said about the OCing of the GPU's is probably where the problem lies?

Not necessarily. A mild or even decently high oc is doable depending on the psu

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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I have a Cooler Master Silent Pro M 700W, and when I ran my rig plus an 8800 GTX on it, it got hot. eXtreme PSU Calculator "claims" that the setup would only run about 621W and yet it ran pretty hot. And the Silent Pro M is a very solid unit. It's an extra 15 quid, and it will better prepare you for higher power output cards.

He isn't necessarily running the same psu as you. There are better psus that run cooler than the silent pro m at the same load.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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Hey everyone, so the title is in the question:

 

As for the rest of the planned specs I'm looking at a locked i5, an SSD, HDD, 8GB RAM.

 

I'm currently only buying one GPU but intend to buy a second whenever the respective manufacturers' next generation of cards come along. This solution is better for me for long-term performance because as it stands I cannot afford to invest in a single, better GPU, before people suggest that :P

 

So, would it be fine?

 

Cheers

 

Chris

 

 

Assuming that the 650W has a single 12V rail it could power it.  Here is the breakdown:

Locked I5: 77/84W

GTX 770/R9-280x @ stock: 500W (250W/each, 275W max for the 770, 300W max for the 280x when OC'ed)

584w+10%(system) =641W.

 

In theory a Power Supply is capable of pushing out about 10% over it's maximum capability.  But I'd recommend against it.

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