sugestion for PSU replacment

[morta]

Your overthinking this and second-guessing yourself now. When you buy a component you need to shop realistically never ever make a purchase for what might occur or what may happen only for what you need. Do you realize that an EVGA 750 W G2 supernova delivers 748 W on the 12 V rail alone?

Unless you're going to add another computer to your computer you don't need any more than what was suggested. Im Not picking on you I'm just trying to help you.

im going on what earth dog originally said " if you sli the 1080, id go 650W-700W" since im upgrading my sysetem eventually to a 1080ti. and looking how the 980-980ti power diffrence was. i thought 750 would be a good choice.

 

[Ungari]

im going on what earth dog originally said " if you sli the 1080, id go 650W-700W" since im upgrading my sysetem eventually to a 1080ti. and looking how the 980-980ti power diffrence was. i thought 750 would be a good choice.

You do realize that he meant a single PSU for the SLI, and not TWO PSU's, one for each GFX card?

 

[jboydgolfer]

i thought 750 would be a good choice.

\yes, a Good Quality 750 Watt PSU would be perfectly reasonable , and adequate.

 

[morta]

You do realize that he meant a single PSU for the SLI, and not TWO PSU's, one for each GFX card?

yes i do realise he ment one PSU...why would you think otherwise.

 

[Ungari]

yes i do realise he ment one PSU...why would you think otherwise.

I put a Wink Smiley, it was just a joke.

 

[morta]

I put a Wink Smiley, it was just a joke.

i totally missed that part my bad

 

[Komshija]

750W is good for SLI 1080s with ooverclocking his entire system...it's overkill for single.

That's true. The other thing is that you'll hardly convince someone who had a 1000W PSU to settle for 600W or 650W. An 550W PSU might be inadequate if you consider OC and the additional hardware, while 600W will be just about enough. That's for the single GPU. For two power-hungry GPU's such as GTX 980Ti (his card) or slightly less power-hungry GTX 1080, I wouldn't recommend less than 750W.

ok so peeps are saying 700-750 is enough for sli and overclocked system? even when upgrading motherbord,cpu and memory? to more then i currently have. sorry for all questions

Personally, for configuration as yours, I would pick a good 650-700W PSU without spending too much money. Candidates that belong into this category are Lepa MaxBron B700-MB, Enermax Thriatlor ECO 650W, Thermaltake Paris 650W etc.

If money isn't an issue, my personal choice for a single GPU system would be Enermax Revolution XT II 650 W or Be Quiet! Straight Power 700W. I like the "safety margin" of additional 100W more than the entire OC'ed system could consume. For a single power hungry GPU and "K" CPU a 600-700W PSU will be sufficient. For SLI a good quality 750-800W will be enough.

You don't really need more than a quality 500 watt PSU. Bear in mind that most quality PSUs also have a reserve capacity as well. Get a 600 watt PSU if you want too but beyond that it's just adding unnecessary expense.

Says a guy who has similar configuration with 750W PSU.

 

[RejZoR]

If you want peak efficiency at high loads, you need PSU that can deliver 2x as much power as you actually need. If your system needs 300W at full load, you'll need a 600W PSU, because PSU's are most efficient at 50% load. This applies if your system is under load majority of time.

If your system will run idle on desktop most of the time doing light tasks, you should look at the lowest power PSU that can still deliver enough power. Again, if your system consumes 300W, ideal would be around 450W PSU, because you'll move the idle peak efficiency further to the top of the curve instead of being at the bottom of the curve.

If you don't really care about efficiency, you simply go with a PSU of your choice that can deliver enough power, has strong amps on important lines and you have like 200W reserve because PSU's aren't something you replace every year just because you've upgraded a graphic card. It's also not smart running it at peak capability either.

I think the era of bad PSU's is now long gone since everyone is chasing high grade components and specs well above ATX specs even on mainstream models. Just a word of general advice. PSU is a heart of the PC. If you give it strong and reliable heart, it'll work for very long time without problems. If you buy very cheap one, it might work the same time, but surgeons will have to poke it here and there and it might need a transplant in the near future. Don't skimp on a PSU!

 

[Ungari]

If you want peak efficiency at high loads, you need PSU that can deliver 2x as much power as you actually need. If your system needs 300W at full load, you'll need a 600W PSU, because PSU's are most efficient at 50% load. This applies if your system is under load majority of time.

If your system will run idle on desktop most of the time doing light tasks, you should look at the lowest power PSU that can still deliver enough power. Again, if your system consumes 300W, ideal would be around 450W PSU, because you'll move the idle peak efficiency further to the top of the curve instead of being at the bottom of the curve.

If you don't really care about efficiency, you simply go with a PSU of your choice that can deliver enough power, has strong amps on important lines and you have like 200W reserve because PSU's aren't something you replace every year just because you've upgraded a graphic card. It's also not smart running it at peak capability either.

I think the era of bad PSU's is now long gone since everyone is chasing high grade components and specs well above ATX specs even on mainstream models. Just a word of general advice. PSU is a heart of the PC. If you give it strong and reliable heart, it'll work for very long time without problems. If you buy very cheap one, it might work the same time, but surgeons will have to poke it here and there and it might need a transplant in the near future. Don't skimp on a PSU!

So, you are recommending a 1000W PSU for OP?

 

[RejZoR]

If he is running system at load most of the time, yes.

 

[morta]

If you want peak efficiency at high loads, you need PSU that can deliver 2x as much power as you actually need. If your system needs 300W at full load, you'll need a 600W PSU, because PSU's are most efficient at 50% load. This applies if your system is under load majority of time.

If your system will run idle on desktop most of the time doing light tasks, you should look at the lowest power PSU that can still deliver enough power. Again, if your system consumes 300W, ideal would be around 450W PSU, because you'll move the idle peak efficiency further to the top of the curve instead of being at the bottom of the curve.

If you don't really care about efficiency, you simply go with a PSU of your choice that can deliver enough power, has strong amps on important lines and you have like 200W reserve because PSU's aren't something you replace every year just because you've upgraded a graphic card. It's also not smart running it at peak capability either.

I think the era of bad PSU's is now long gone since everyone is chasing high grade components and specs well above ATX specs even on mainstream models. Just a word of general advice. PSU is a heart of the PC. If you give it strong and reliable heart, it'll work for very long time without problems. If you buy very cheap one, it might work the same time, but surgeons will have to poke it here and there and it might need a transplant in the near future. Don't skimp on a PSU!

i know its the heart of the pc. thats why i went with a corsair hx1000 5 years ago when i first built this thing thats a quality psu and not skimping out at all. but now i need to change it.

 

[64K]

Says a guy who has similar configuration with 750W PSU.

You're making assumptions. When I built this PC it was with a GTX 680 in mind and I wanted to have room for SLI 680s and overclocking them and the CPU if necessary. Even then a 650 watt PSU would have been enough but I happened to get the Corsair 750 watt on a good sale for the same price as the 650 watt PSU I was going to get so why not. The fact is I never SLI because I upgrade so often so the next build I will get a 600 or 650 watt PSU with a similar single 250 watt GPU. btw a GTX 980 Ti isn't similar to a GTX 1080 in power usage.


Max PSU efficiency is really only relevant if you are paying a lot for electricity or running your rig 24/7 at max for folding. For example with me I game on average 15 hours a week on this rig. With my Gold rated PSU the max is 90% efficiency at 50% of PSU usage. It drops 3% to 87% at 20% usage or 100% usage. I pay 10 cents a kWh so

20% PSU usage = 150 watts * .03 (loss of efficiency) * 15 hours a week* 52 weeks/ 12 months / 1000 watts (kWh) * .1 (10 cents) = 3 cents a month additional on my electricity bill

100% PSU usage = 750 watts * .03 (loss of efficiency) * 15 hours a week* 52 weeks/ 12 months / 1000 watts (kWh) * .1 (10 cents) = 15 cents a month additional on my electricity bill

https://en.wikipedia.org/wiki/80_Plus

 

[morta]

right well im either going to go for this https://www.scan.co.uk/products/750w-evga-supernova-750-g3-80-plus-gold-fully-wired-sli-crossfire-single-rail-624a-plus12v-1x130mm-f?utm_source=google shopping&utm_medium=cpc&gclid=Cj0KEQiA4JnCBRDQ5be3nKCPhpwBEiQAjwN1bil2REIgGZPrbqnhPFtQSM1vSpO6X54dadzeV5qSslgaAoR_8P8HAQ or this https://www.novatech.co.uk/products...=google&utm_medium=base&utm_campaign=products

those seem like good options. more so the 850. the corsair unit i have is a platinum. not sure how much of a dif that is compering it with these as its an old unit

 

[EarthDog]

That's true. The other thing is that you'll hardly convince someone who had a 1000W PSU to settle for 600W or 650W. An 550W PSU might be inadequate if you consider OC and the additional hardware, while 600W will be just about enough. That's for the single GPU. For two power-hungry GPU's such as GTX 980Ti (his card) or slightly less power-hungry GTX 1080, I wouldn't recommend less than 750W.

Personally, for configuration as yours, I would pick a good 650-700W PSU without spending too much money. Candidates that belong into this category are Lepa MaxBron B700-MB, Enermax Thriatlor ECO 650W, Thermaltake Paris 650W etc.

If money isn't an issue, my personal choice for a single GPU system would be Enermax Revolution XT II 650 W or Be Quiet! Straight Power 700W. I like the "safety margin" of additional 100W more than the entire OC'ed system could consume. For a single power hungry GPU and "K" CPU a 600-700W PSU will be sufficient. For SLI a good quality 750-800W will be enough.

I know WITHOUT A DOUBT that a 500-550W quality psu will EASILY power a single 1080 and an ivybridge overclocked to the he max with ambient cooling while allowing for quiet operation. For Pete's sale people it's a 180W card with low power limits!!!!! You won't push these things past 250W without modifying the bios.

I ran a 980ti maxed out and a 6700K at 4.8ghz and it barely broke 450W AT THE WALL (a bit over 400W actual)!! That is also with 2 hdd, 2 ssd, 5 fans and a water pump. Remember a 980ti is a 250W card....

The efficiency thing, lol, omg... did I step over to Tom's or is this an enthusiast space? who I their right mind would recommend double the power needed just be close to the most efficient part of the psu?? We do know that efficiency curve of the psu is pretty flat, right? And that the difference is literally 1-3% at most and won't be made up???

Thus place disappoints me on a daily basis now it seems with some of the knowledge shared among members...

Morta - Get whatever is cheaper between the two and leave this thread in case you get more users blowing smoke confusing things. if it was me, it would be the 750W model assuming you are going sli.

 

[morta]

I don't give a hoot about what you think. I know for a fact WITHOUT A DOUBT that a 500-550W quality psu will EASILY power a single 1080 and an ivybridge overclocked to the he max with ambient cooling.

For Pete's sale people it's a 180W card with low power limits!!!!! You won't push these things past 250W without modifying the bios!!!

I ran a 980ti maxed out and a 6700K at 4.8ghz and it barely broke 450W AT THE WALL (a bit over 400W actual)!! That is also with 2 hdd, 2 ssd, 5 fans and a water pump.

The efficiency thing, lol, omg... did I step over to Tom's or is this an enthusiast space? who I their right mind would recommend double the power needed just be close to the most efficient part of the psu?? We do know that efficiency curve of the psu is pretty flat, right? And that the difference is literally 1-3% at most and won't be made up???

Thus place disappoints me on a daily basis now it seems with some of the knowledge shared among members...

Get whatever is cheaper between the two and leave this thread in case you get more users blowing smoke confusing things.

I plan on going sli again though. As well as upgrading to a new cpu, motherboard and ram. I'm not going to be sticking with a z77 and i5 3570k for much longer.

 

[EarthDog]

And? Power use of cpus and such arent changing much. I fact, it should go down or at least be in the ballpark. That point was mentioned here in what has become a 60+ post debacle on an incredibly basic question.

Again, you going sli and upgrading to 1080ti now.... go 750w or 850w. anything more is a waste of your money for no reason.

How the hell did I run across this thread again after being unsubscribed, lol!!!

PS - I am grumpy as hell today it seems.. will get some coffee and shake this off....

 

[morta]

And? Power use of cpus and such arent changing much. I fact, it shod go down. That point was mentioned here in what has become a 60+ post debacle on an incredible basic question.

Again, you going sli and upgrading on 1080ti now.... go 750w or 850w. anything more is a waste of your money for no reason.

How the hell did I run across this thread again after being unsubscribedone, lol!!!

yea i know i dont claim to know everything. i just want to make sure i make the right choice before i click the buy button. thanks. im going for the 850

 

[morta]

And? Power use of cpus and such arent changing much. I fact, it should go down or at least be in the ballpark. That point was mentioned here in what has become a 60+ post debacle on an incredibly basic question.

Again, you going sli and upgrading to 1080ti now.... go 750w or 850w. anything more is a waste of your money for no reason.

How the hell did I run across this thread again after being unsubscribed, lol!!!

PS - I am grumpy as hell today it seems.. will get some coffee and shake this off....

lol coffee is good

 

[Komshija]

I know WITHOUT A DOUBT that a 500-550W quality psu will EASILY power a single 1080 and an ivybridge overclocked to the he max with ambient cooling while allowing for quiet operation. For Pete's sale people it's a 180W card with low power limits!!!!! You won't push these things past 250W without modifying the bios.

It depends how much room you want for the safety margin. For instance, if you want a 100W safety margin, than 500-550W PSU's (even the 80 Plus Platinum ones) are out of the question. Online PSU calculators already include some safety margins.

Besides, you are also not being a good example when suggesting 500W or 550W PSU, while in your specifications you have 1000W and 750W PSU's. Some people might think "what the hell is he talking about?", even if your statements are correct. Today a 500 or a 550W PSU doesn't "sound good", so you have to take that into the account as well, especially to someone who had a 1000W PSU. The price difference between a good affordable 600-700W PSU (that would be 80 Plus Bronze from the reputable manufacturer) and similar 500-550W PSU is quite small considering the prices of other components.

 

[morta]

i went with the evga g2l 850 in the end.

 

[EarthDog]

It depends how much room you want for the safety margin. For instance, if you want a 100W safety margin, than 500-550W PSU's (even the 80 Plus Platinum ones) are out of the question. Online PSU calculators already include some safety margins.

Besides, you are also not being a good example when suggesting 500W or 550W PSU, while in your specifications you have 1000W and 750W PSU's. Some people might think "what the hell is he talking about?", even if your statements are correct. Today a 500 or a 550W PSU doesn't "sound good", so you have to take that into the account as well, especially to someone who had a 1000W PSU. The price difference between a good affordable 600-700W PSU (that would be 80 Plus Bronze from the reputable manufacturer) and similar 500-550W PSU is quite small considering the prices of other components.

That is what I am trying to tell you, overclocked to the hilt you get 100W-150W headroom with a 500W-550W PSU.

As far as my example, LOL... the 1KW unit is 5 years old. It is used in a TEST bench where I can have up to 3-4 GPUs in the system (I am a reviewer and benchmark competitively at Hwbot - when I have time). So I need that at times. As far as the 750W G2 I have, that was purchased 2 years ago when I had a 500W GPU (295x2) and an overclocked 5820K (4.2-4.7GHz), so, it was also needed at the time. Most would also suggest running that system on a 1KW PSU!!!! So my money is EXACTLY where my mouth is.. Nice try. It would make even less sense to sell the units one already has. We are talking about someone buying one NOW.

As far is it not 'sounding good'... LOL again.. this is EXACTLY why those that are in the know help people out. To show them the FACTS. We can't force their decision, but we can say, 'hey, that is double what you need'. And while the price difference is small between similarly spec'd PSUs from 500-700W, its still $20-30 more than one NEEDS to spend... which is the point. I would rather save that $20-30 and take the wife out to lunch or get my kids something...... or god forbid, save it, than to overpay like many do for absolutely no reason.

 

[morta]

i did forget to mention that this unit has carryd my whole rig for like 5 years maybe even more..i cant remeber but I started of with a 5870 then to a 7970 then 980ti and then sli 980ti. and now back to 980ti which is going to be replaced with a 1080

 

[EarthDog]

All systems that could have run happily with a 550W PSU bud...

 

[morta]

and leave me with no headroom for future..no thanks.. im happy with my 850 thanks rather be safe then sorry.. 24 hour use and all

 

[EarthDog]

You have plenty of headroom for a any single GPU and CPU in the future... but if you are using two, you want that 750-850W range.