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PSU good enough for SLI 570s? - Page 2

post #11 of 28
Also note that with quality supplies it will be rated at continuous, peak will be higher. If i recall correctly the AX750 can put out about 900 maximum and 750 continuous.
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post #12 of 28
Correct and it's not difficult to figure out what the PSU it putting out once you have a reading at the wall socket.

I had the TX750 before I installed both 570's and now that they're installed I've been searching for a suitable replacement. The 750 is handling the job (in terms of no power cuts or other notable issues) but I would prefer to run a psu within it's higher efficiency range.

I'll get a wall measurement soon as I am curious on where my system stands but ultimately I will need to replace the PSU if I still plan on installing another 570.

Quote:
Originally Posted by TwoCables View Post
The rating of the PSU is not its capacity in regards to what it can draw from the wall. Instead, it's the capacity that it can provide to the system.

So let's say that we have a system that is causing the power supply to pull 650W from the wall during a load test. Now let's also say that the efficiency is exactly 85% at the time of this power draw. This means that the computer system is pulling 552.5W from the power supply (650W * .85). So for this system, a quality 650W would be fine.

But now I'm curious: you have a TX750 powering your system and you have two GTX 570s in it. So, what's the highest power draw you've ever seen? Also, why are you saying things like "My conclusion, will a 750w PSU work? Yes. Will it work well? If it's a good unit then yes. Would you be better off with an 850-950 unit? Absolutely."? I mean again, you have a 750W power supply powering your system that has two GTX 570s in it. So if you are saying these things, then why don't you have a 'bigger' power supply?

Finally, don't worry about straining your PSU. According to these two excellent articles by Phaedrus2129, a quality 750W is right in the sweet spot for powering a modern system with two 570s in it:

http://www.overclock.net/power-suppl...fficiency.html

http://www.overclock.net/power-suppl...load-myth.html

[Source]
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post #13 of 28
The True Power 750 is a great PSU!
However i wouldn't recommend overclocking the cards AND the cpu at the same time
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post #14 of 28
Quote:
Originally Posted by Dark View Post
Correct and it's not difficult to figure out what the PSU it putting out once you have a reading at the wall socket.

I had the TX750 before I installed both 570's and now that they're installed I've been searching for a suitable replacement. The 750 is handling the job (in terms of no power cuts or other notable issues) but I would prefer to run a psu within it's higher efficiency range.

I'll get a wall measurement soon as I am curious on where my system stands but ultimately I will need to replace the PSU if I still plan on installing another 570.
A third GTX 570? You bastid...

In that case, you should consider something like the HX850! Or, is that too expensive?

Quote:
Originally Posted by Mr OCN View Post
The True Power 750 is a great PSU!
However i wouldn't recommend overclocking the cards AND the cpu at the same time
Ha! I would.
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post #15 of 28
Quote:
Originally Posted by TwoCables View Post
A third GTX 570? You bastid...

In that case, you should consider something like the HX850! Or, is that too expensive?


Ha! I would.
I was looking at the AX1200, no real intention of ever reaching its limits but I love that 100amp rail.

I was looking at the HX850 though, almost bought it the other day till I noticed Best Buy actually has the AX1000 for $250.
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post #16 of 28
Quote:
Originally Posted by Dark View Post
I was looking at the AX1200, no real intention of ever reaching its limits but I love that 100amp rail.

I was looking at the HX850 though, almost bought it the other day till I noticed Best Buy actually has the AX1000 for $250.
Going with an overkill PSU like that will result in a lower efficiency. This means that even though the power draw on the PSU doesn't change, the power draw at the wall will be higher than it would be with something like the HX850.

But here's more information about that:

http://www.overclock.net/power-suppl...fficiency.html

http://www.overclock.net/power-suppl...load-myth.html
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post #17 of 28
You bring up a good point though with 3 570's I would imagine my system will pull something around 600+ watts (from the psu) which would put it in the 'sweet spot' for the ax1200 and give me some room for overclocking/drives/etc. BUT I can see that during idle and low load periods you would be correct that it would likely place me outside of the efficiency.

I'll take your advice in to consideration and also look in to the HX1000.

Quote:
Originally Posted by TwoCables View Post
Going with an overkill PSU like that will result in a lower efficiency. This means that even though the power draw on the PSU doesn't change, the power draw at the wall will be higher than it would be with something like the HX850.

But here's more information about that:

http://www.overclock.net/power-suppl...fficiency.html

http://www.overclock.net/power-suppl...load-myth.html
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post #18 of 28
Why then on Newegg the PSU calculator say two 570's need 873 watts?
     
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post #19 of 28
Quote:
Originally Posted by Arizonian View Post
Why then on Newegg the PSU calculator say two 570's need 873 watts?
When I calculate my system with 2 570's on the Antec PSU calculator, it says 700 watt recommended.

(My 460 SLI 550w)
post #20 of 28
I know Newegg asks what CPU, motherboard range, memory, HDD and optical drive, devices are also running in their questions before showing recommended watts. Weird how each site varies.

I ask this because I'm thinking about either going one 580 with deitcated physx card or two 570's. I'd rather go two 570's but don't want to run my 1000watt psu past 800 watts and be at high load all the time.
     
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