Is 850w overkill?

[CometLake]

I was going to buy the 750w Seasonic Gold (new version post january 2018), but the local store here sold it out and they offer me the 850w Seasonic Gold (new version post january 2018).

 

Should I search somewhere else, or will the 850w work perfectly fine with my setup? (without consuming extra watts).

 

Another option is the 650w, but according to Cooler Master PSU calculator website, I will be in the limit.

 

Setup: Intel i9 10900k / Asus Maximus XII (Z490) / 32 GB Ram (2x16, can upgrade to 64GB) / One Disk M.2 nvme and 2 Disks SSD sata / NVIDIA 2080 Super Video Card

 

Thank you.

[Prodigy_Smit]

650 watts should be good, PSU calculators are mostly bs anyways.
Wait for more opinions tho before buying as I could be wrong.

[Spotty]

1 minute ago, Smit Devrukhkar said:

PSU calculators are mostly bs anyways.
Wait for more opinions tho before buying as I could be wrong.

No, you're right. Those PSU calculators are bullshit.

Each 1TB SSD adds 80W to the estimation!! LOL! Who approves this shit at Cooler Master, seriously?

 

8 minutes ago, CometLake said:

Setup: Intel i9 10900k / Asus Maximus XII (Z490) / 32 GB Ram (2x16, can upgrade to 64GB) / One Disk M.2 nvme and 2 Disks SSD sata / NVIDIA 2080 Super Video Card

That system is going to consume less than 500W. 850W is more than you need, but it doesn't really matter if you have more than you need. If the 850W is all that's available and you're happy to pay the price then go for it. Otherwise look at other PSU models that are in stock.

[Samfisher]

That setup would prob draw about 400w fully loaded on the CPU and GPU, so a 650w would be great cos the best efficiency is to be had around 50% of capacity.  A 750w if you think you'll add another GPU in the future, but SLi is...kinda dead so unless the 850w price is ok to you, you can just look for a good 650w unit.

[suedseefrucht]

I would not recommend to run a PSU at it's limit. It could be loud and unstable.
With 750W PSU you use 81%

With 850W PSu you use 71%

So both should be fine.

If you can a 750W for a lower price than the 750W, you are safe to go with 750W...

 

With 650W PSU you use 93% which could be critical.

[lazypc]

Every power supply has a different efficiency curve, without seeing graphs for the ones your considering I can only offer an opinion based of general rule of thumb.

Most power supplies are at peak efficiency between 50-70% of rated load.

So at an estimated 500-650 watt load I would go with that 850, especially since it is what is available. Besides, since that Seasonic power adapter leak for the RTX 3080 recommended a 850 watt power supply or better, maybe your leaving some room for a power hungry upgrade in the future.

[Spotty]

4 minutes ago, lazypc said:

Every power supply has a different efficiency curve, without seeing graphs for the ones your considering I can only offer an opinion based of general rule of thumb.

Most power supplies are at peak efficiency between 50-70% of rated load.

Incorrect.

 

But since you asked here's the efficiency curve for the Seasonic Prime Gold 850W

Spoiler

 

Edit: Actually it looks like that's the wrong graph included in the Cybenetics testing report, the efficiency is too high for the 80+ Gold model. I think they included the graph for the Platinum(?) model in the report for the Gold, and vice versa. Also their report for the 850W Titanium is wrong and shows higher efficiency on 115V instead of 230V.

 

 

The graph included in the report for the 750W Prime Gold appears correct.

 

Edited August 26, 2020 by Spotty

[Chris Pratt]

You can't have too much wattage on a PSU. If it doesn't need it all it won't use it all. The only factor in choosing a wattage that's close to what your actual rig needs, is cost, i.e. spending more for more watts than you need.

 

In that regard, you only need around 450W for your setup, which means you'd ideally want a 550-650W PSU. However, the next gen cards, at least from Nvidia, are rumored to be much more power hungry, potentially drawing 400-500W, and there's reports that you will need an 850W PSU as the price of entry. Based on that, if you are considering a GPU upgrade at any point in the future, I'd shoot for an 850W, to be safe.

[lazypc]

Looks like they went for maximum efficiency at idle, which depending on the role of the machine isn't a bad thing.

 

Looking at those graphs there really isn't going to be a noticeable difference between the two for this use case.

[Mateyyy]

I'd say go for the 750W if you plan on attempting to go 5.2GHz+ all-core on that 10900K and also overclocking that 2080 Super as far as you can. Otherwise, 650W, or even 550W would be plenty.

 

I probably wouldn't get the Focus GX/GM though, unless it's your only option, as it tends to be a little on the loud side. I'd rather look for something like a Corsair RMx or be quiet! Straight Power 11.

[Ankerson]

8 hours ago, CometLake said:

I was going to buy the 750w Seasonic Gold (new version post january 2018), but the local store here sold it out and they offer me the 850w Seasonic Gold (new version post january 2018).

 

Should I search somewhere else, or will the 850w work perfectly fine with my setup? (without consuming extra watts).

 

Another option is the 650w, but according to Cooler Master PSU calculator website, I will be in the limit.

 

Setup: Intel i9 10900k / Asus Maximus XII (Z490) / 32 GB Ram (2x16, can upgrade to 64GB) / One Disk M.2 nvme and 2 Disks SSD sata / NVIDIA 2080 Super Video Card

 

Thank you.

 

 

Well factor in the long warranty of the PSUs and future upgrades or builds.

 

750W to 850W is fine.

 

Nothing wrong with going with the 850W PSU as long is it's a good quality unit.

 

PSUs are really an investment due to the long warranties of the better units, 10 to 12 years.

 

Something like a Corsair RMX 750W or 850W would be a nice choice.

 

All depends on how many PSUs you want to have to buy in the next 10-12 years, one? Or 2 or 3?

[GoldenLag]

11 hours ago, CometLake said:

Should I search somewhere else, or will the 850w work perfectly fine with my setup?

will be more than enough. 650w would be enough.

where you located? cuz some places have very nice deals on perticular PSUs. 

[Kisai]

20 hours ago, Spotty said:

No, you're right. Those PSU calculators are bullshit.

Each 1TB SSD adds 80W to the estimation!! LOL! Who approves this shit at Cooler Master, seriously?

 

That system is going to consume less than 500W. 850W is more than you need, but it doesn't really matter if you have more than you need. If the 850W is all that's available and you're happy to pay the price then go for it. Otherwise look at other PSU models that are in stock.

SSD's pull more power than HDD's do under very specific conditions.

 

https://www.micron.com/-/media/client/global/documents/products/technical-marketing-brief/brief_business_case_pcie_ssd.pdf

Micron claims 25w vs the 7.2 for a 15K HDD. However the actual energy use pattern would have to be substantially different as I feel that HDD is a low-ball figure, as the power supplies the "My Book" externals are supplied with are 12V 2A (24w.) So if that's what they based it on, it's quite off the mark.

 

https://cdn.mos.cms.futurecdn.net/PcZPQte765p9FccHhC8ygQ-970-80.png.webp

 

So here we have the exact opposite of the Micron marketing. With the NVMe SSD's being less than half of their same-brand performance mechanical drive. The Optane module here is a PCIe 4X card, and is still half the marketing.

 

Considering that most NVMe drives are 2280's, I actually wonder if it's even fair to compare SSD's in other form factors.

[Spotty]

1 hour ago, Kisai said:

SSD's pull more power than HDD's do under very specific conditions.

Most consumer SSDs draw between 5-10W max. While idle less than 0.1W.

 

PCIe slot SSDs can draw more power. Not M.2 PCIe SSDs, but PCIe slot cards that are sometimes used for server applications. Like the Intel P3608 which can have up to 30-40W max power draw. That's the higher power draw SSD I can find right now, though there might be some even more niche SSDs that might have higher power draw that I'm not aware of. Though those are uncommon in the consumer space, and anyone using those should not be using an online PSU calculator.

U.2 drives might user more power, maybe 10-15W area depending on the drive, but again those are very much server space and not consumer orientated drives.

 

2.5" SATA SSDs are only drawing a few watts. The 2.5" SATA Samsung 860 Evo is max 4W when read/write. That's more or less the same across most of the 2.5" and M.2 SATA drives, with maybe a few watts difference between various models. I think you would have a hard time finding any SATA SSD which draws more than 10W while reading/writing. M.2 NVMe (2280) drives aren't much different either. The Gigabyte Aorus Gen4 PCIe SSD for example is 6.5W when reading/writing. The Samsung 970 Pro NVMe is 8.5W max. So again they will be in the 5-10W range depending on the drive.

 

 

Regardless it's pretty ridiculous that the Cooler Master PSU calculator adds 80W per SSD. Try it. If you add 5 SSDs to the calculator it increases the estimation by 400W. 

 

I'd really like to know who came up with that internally at Cooler Master.

"Hey Steve, how much does a 1TB SSD draw? I'm doing this new PSU calculator and I'm stuck on this one"

"Hmm, I'm not sure, Tim... 80W?"

"80W? Are you sure? That's more power than a GTX 1650 or the average i5 CPU??"

"Yeah, pretty sure, haven't you seen people mounting Noctua NH-D15's to their SSDs to dissipate all that heat?"

 

1 hour ago, Kisai said:

However the actual energy use pattern would have to be substantially different as I feel that HDD is a low-ball figure, as the power supplies the "My Book" externals are supplied with are 12V 2A (24w.) So if that's what they based it on, it's quite off the mark.

That would sound correct for its initial start up when it starts to drive the motor and spin the platters. There is, for only a few seconds, a higher than normal operating power draw during start up. This is why some servers feature staggered start up for their drives. It'll just be a very short burst of maybe up to 20W lasting a second or two and then it'll go down to its average power draw of typically somewhere around 4-10W depending on the drive. That table you posted showing 4.6 to 9.4W seems fairly accurate for operating power consumption not initial start up.

[Ankerson]

Yeah, they don't draw all that much for sure... M.2 and SATA SSDs...

 

The PCIe riser card with drives and PCIe SSD's could draw more as they are plugged right in the PCIe slot on the MB...

 

Some of them will give some wattage just because of the motherboard alone as you can't remove it, can only change it to another form factor. Can't have a computer without a motherboard...

 

Add an SSD and it adds almost nothing.... Like 4 watts or something...

 

I see what they are doing with the Cooler Master one however....

 

They are doing everything at TDP and that is WAAAAAAAAAY TOOOOOOO LOOOOW and seems like they use the SSDs as a buffer... 

 

Configure it without the SSD's and you will see what I am talking about.... LOL

 

Not exactly the right way to do it..... They need to redo it...

 

Ends up being about the same as the others once it's done, the others are more accurate as in the way they do it however.

[CometLake]

Thank you everyone for the responses. I am still waiting for the answer of the local store here to see if they will have the 750w available again next week. If not, I could probably go with the 850w.

 

With the pandemics situation, it seems computer stores are out of stock, specially with PSUs.

 

Thanks again.