New Corsair 750W PSU - single 12V rail @ 60A

[miahallen]

Found this avalible on newegg today, looks like I found my next PSU...if it holds up to the standard Corsair has held to so far.

There is also a 650W version, here is Corsairs webpage.

[tibetan mod king]

Interesting that the 750W power supply is quieter than the 650W power supply all the way up to 375W. The 750W unit is 18dB up to 375W whereas the 650W unit is 21-23 dB.

[hulubei]

The bigger version has a 140mm fan, and not 120mm.

Review for TX750W.

[ryboto]

Found this avalible on newegg today, looks like I found my next PSU...if it holds up to the standard Corsair has held to so far.

There is also a 650W version, here is Corsairs webpage.

are you going to be running Tri SLI or something?? who needs that much power?

[miahallen]

That's what I keep telling those fools buying 900-1300W units. I think 750W is kind of a sweet spot for high power machines. My 500W is holding out for now, but I'm trying to push my OCs a bit more, and I don't want to damage any of my components. The 620W Corsair would be more than enough for me right now, but the 750W version will give me growing room for the future, like if I decide to add another GTX later.

[angelkiller]

are you going to be running Tri SLI or something?? who needs that much power?

With this PSU, you could fully load a quad core CPU and a GTX without the fan ramping up. Possibly SLI while the PSU stays @ 18dba. Right?

It's not so much the total power but rather the amount of power delivered quietly.

[mcoleg]

that psu looks like a pcp@c silencer with a bottom fan:

http://www.newegg.com/Product/Product.a ... 6817703009

considering that both are seasonic-made, that's hopefully what it is.

miahallen

don't worry too much about damaging the components with a 500w psu. check here:

viewtopic.php?t=41127&highlight=

and it does take a lot to make the fan to ramp up on that psu as well. it's more about the settings on the thermal controller that the power the psu outputs.

[miahallen]

Thanks for the thoughts mcoleg...like I said before, I've argued the subject quite a bit. But I think if I was to upgrade the 500W unit I use now, it would be silly not to plan ahead for unseen needs. I thought when I bought this PSU, that it would last me for years, but that was before dual core CPUs (not to mention quads) and the G80 GPU was released.

Right now I'm running the following
Q6600 @ 3.2GHz w/1.325V - est 200W
4x1GB Crucial Ballistix - est 40W
1x P35 mobo @ 400MHz FSB - est - 50W
1x 8800GTX @ 621-1512-1026 - est 150W
4x SATA2 HDDs - est 40W
1x DVD-R/RW - est 10W
6x 120mm fans - est 25W
total power - est 515W

Now, my estimates are all a bit on the high end (except the CPU which may be higher) and I realize that I'll never be loading all 4 HDDs at the same time. But, I do plan to add at least a couple more HDDs.

My point is, with my current config I'm stable, but I'm pushing it. I'm getting the TRUE soon and I want to OC my quad a bit further (up to 3.6GHz at least), so an upgrade isn't unreasonable. If your E6600 was pulling 135W @ 3.6GHz with 1.47V and I have two of them (Q6600) running at the same settings, I could expect to consume almost twice what you did - 270W JUST WITH MY CPU, NO?

If I decide to go SLI later, the 750W will give me the headroom I may need.

[jaganath]

Now, my estimates are all a bit on the high end

you can say that again!

4x1GB Crucial Ballistix - est 40W

~4W more realistic. if they took 40W they would be nice and crispy by now.

6x 120mm fans - est 25W

again, single digit watts. 6-8W.

If your E6600 was pulling 135W @ 3.6GHz with 1.47V and I have two of them (Q6600) running at the same settings, I could expect to consume almost twice what you did - 270W JUST WITH MY CPU, NO?

it doesn't work like that. TDP of E6600 65W, TDP Q6600 105/95W, power consumption of Q6600 is not 2x E6600. even with the 50% OC up to 3.6G, I would say only 150W power draw, as your voltage is more or less stock.

a kill-a-watt or power angel is a useful addition to any SPCRer's toolbox.

[miahallen]

Now, my estimates are all a bit on the high end

There, I said it again!

4x1GB Crucial Ballistix - est 40W

Looked it up, and you are correct 4-5W each...but there's 4, so 12-16W total.

6x 120mm fans - est 25W

Again, you are correct if I was saying 25W per fan...but my #s came from 4W (each) x6 ~25 - I guess I underestimated according to your #s.

If your E6600 was pulling 135W @ 3.6GHz with 1.47V and I have two of them (Q6600) running at the same settings, I could expect to consume almost twice what you did - 270W JUST WITH MY CPU, NO?

It doesn't work like that. TDP of E6600 65W, TDP Q6600 105/95W, power consumption of Q6600 is not 2x E6600. even with the 50% OC up to 3.6G, I would say only 150W power draw, as your voltage is more or less stock.

Yes, right now my voltage is more or less stock, but what I was saying, is I plan to increase my voltage, in order to attain a higher OC. Power increase is linear with speed, but exponential with voltage increases. So going up to even a modest 1.45V (stock VID is 1.285V) would make a large difference in power draw.

Don't worry, before I invest in a new $180 PSU I'd invest in a Kill-o-watt meter or something similar [/quote]

[jaganath]

Again, you are correct if I was saying 25W per fan...but my #s came from 4W (each) x6 ~25 - I guess I underestimated according to your #s.

I was saying 6-8W for all 6 fans, e.g. the Nexus 120mm uses 1.8W max. although if you are using faster fans this will go up, so maybe 4W per fan is a fair number. anyway, it's a small % of overall power, so no big deal.

[Oklahoma Wolf]

considering that both are seasonic-made, that's hopefully what it is.

The TX750 is Channel Well made... the VX450 and the two HX models are the Seasonics.

[ryboto]

Thanks for the thoughts mcoleg...like I said before, I've argued the subject quite a bit. But I think if I was to upgrade the 500W unit I use now, it would be silly not to plan ahead for unseen needs. I thought when I bought this PSU, that it would last me for years, but that was before dual core CPUs (not to mention quads) and the G80 GPU was released.

Right now I'm running the following
Q6600 @ 3.2GHz w/1.325V - est 200W
4x1GB Crucial Ballistix - est 40W
1x P35 mobo @ 400MHz FSB - est - 50W
1x 8800GTX @ 621-1512-1026 - est 150W
4x SATA2 HDDs - est 40W
1x DVD-R/RW - est 10W
6x 120mm fans - est 25W
total power - est 515W

Now, my estimates are all a bit on the high end (except the CPU which may be higher) and I realize that I'll never be loading all 4 HDDs at the same time. But, I do plan to add at least a couple more HDDs.

My point is, with my current config I'm stable, but I'm pushing it. I'm getting the TRUE soon and I want to OC my quad a bit further (up to 3.6GHz at least), so an upgrade isn't unreasonable. If your E6600 was pulling 135W @ 3.6GHz with 1.47V and I have two of them (Q6600) running at the same settings, I could expect to consume almost twice what you did - 270W JUST WITH MY CPU, NO?

If I decide to go SLI later, the 750W will give me the headroom I may need.

maybe I'd say your system would consume close to 400W at full load, but that's FULL load. How often will you be loading all 4 cores, and loading the GTX to it's fullest? I just still see no need for more than a quality 500W power supply for such a system. If you're going SLI with the overclocked quad, sure, 600W might be a better idea, but 750W?!

[jaganath]

If you're going SLI with the overclocked quad, sure, 600W might be a better idea, but 750W?!

750W seems reasonable to me. bumping the OC on Q6600 up to 3.6G/~1.5V means it won't be far off 200W, + 2x 8800GTX (300W), say 100W for all the other stuff, that's 600W. it's not a good idea to run a PSU on the redline, as efficiency generally drops off at maximum load.

also, here at SPCR we have to be careful not to browbeat people into buying the lowest-capacity PSU they can possibly get away with; it's a reaction against the 1000W+ PSU phenomenon, and it's understandable, but there really are cases where a large capacity PSU is the right choice, and it seems like this setup is one of them.

[Celoth]

Having a PSU that only *just* provides enough stable power for the system will not be the quietest and coolest solution in most cases, unless it's possible to get by with one of the passive or watercooled solutions. If getting an air cooled PSU, my suggestion is to figure out the idle to max load watt range of the system you have, and then find some PSUs with max efficiency in that range for comparison.

Efficiency > all, assuming the rails are stable and all that. It's possible to change the fan to a quieter one, and you can add mufflers, but you can't increase the efficiency. High efficiency = less heat = less fan RPMs needed = less noise and lower electric bill. Even a few % better efficiency will add up over a couple of years, and will help even out the cost of getting a higher watt PSU.

Quite often efficiency peaks at around half the max rated wattage of the PSU, but the best brands keep the efficiency fairly even at all but the lowest and highest loads. Even so, if you know the system is going to pull up to 400 watt at load, I would look at 600-800 watt PSUs to start with.

[ryboto]

750W seems reasonable to me. bumping the OC on Q6600 up to 3.6G/~1.5V means it won't be far off 200W, + 2x 8800GTX (300W), say 100W for all the other stuff, that's 600W. it's not a good idea to run a PSU on the redline, as efficiency generally drops off at maximum load.

also, here at SPCR we have to be careful not to browbeat people into buying the lowest-capacity PSU they can possibly get away with; it's a reaction against the 1000W+ PSU phenomenon, and it's understandable, but there really are cases where a large capacity PSU is the right choice, and it seems like this setup is one of them.

I understand your reasoning, but how often are you going to load the ENTIRE system? Even so, going on your wattage figures, 600W would be plenty for a single GTX system, so why 750W if that's all you have?

[mcoleg]

that overclock draws close to 160w 100% load, about 25w more than on the cpu i've tested. you can sort of estimate it here, under the overclock part:

http://www.extreme.outervision.com/psuc ... orlite.jsp

the rest of the calculator is so-so but that bit is useful.

the rest of your system is very close to mine so you can actually see what it would draw.

would be interesting to see what a kill-a-watt type gadget would say.

if you go sli and overclock the vid. cards, that will put a lot of pressure on the 12v rail, more so than your quad overclock. at that point 60 amp 12v rail of that 750w cpu does not sound like a bad idea.

if that the reasoning, than you made a good choice.

once again though - if you expect that running under proportionally lower loads will make the fan in the psu spin less, i don't know... as i mentioned before, it will depend on the settings on the temp. controller.

[gforcefan]

considering that both are seasonic-made, that's hopefully what it is.

The TX750 is Channel Well made... the VX450 and the two HX models are the Seasonics.

Yes, the tx750 is not seasonic.
http://www.hardocp.com/article.html?art ... RodXNpYXN0

I would love to have a spcr review because I can get the 750 at the same price as the 620. I understand the 750 is more than most people here need, but it has a 140 fan -- it would be great to know how it compares soundwise.

[mcoleg]

ah, sry...

[mantralord]

I doubt the small amount of energy saved by buying a 750W PSU instead of a 400-500W will outweigh the extra waste when it ends up at a landfill. And even if systems that draw that much exist, it doesn't mean they should exist, and they are pointless for consumer applications.

Ultimately this falls into a question of consumer ethics, which gamers/overclockers have none of.

[Redzo]

750W seems reasonable to me. bumping the OC on Q6600 up to 3.6G/~1.5V means it won't be far off 200W, + 2x 8800GTX (300W), say 100W for all the other stuff, that's 600W. it's not a good idea to run a PSU on the redline, as efficiency generally drops off at maximum load.

also, here at SPCR we have to be careful not to browbeat people into buying the lowest-capacity PSU they can possibly get away with; it's a reaction against the 1000W+ PSU phenomenon, and it's understandable, but there really are cases where a large capacity PSU is the right choice, and it seems like this setup is one of them.

I understand your reasoning, but how often are you going to load the ENTIRE system? Even so, going on your wattage figures, 600W would be plenty for a single GTX system, so why 750W if that's all you have?

So if i decided to uppgrade to SLI I would have to buy a new PSU ??? So if I decided to listen to you would you pay for my new PSU next time I uppgrade ?

You never uppgrade don't you ?! Or do you buy a new PSU every time ? Guy has a powerfull system and he wants a PSU theat will last for a while. Is that hard to understand ?

[Redzo]

I doubt the small amount of energy saved by buying a 750W PSU instead of a 400-500W will outweigh the extra waste when it ends up at a landfill. And even if systems that draw that much exist, it doesn't mean they should exist, and they are pointless for consumer applications.
.

Let me guess, you run 286 and spend most of your time editing .txt documents ?
Please don't talk about stuff you don't use. 2 GTX (not to mention HD2900XTs together with overclocked quad and a few HDs will draw 350-600W depending on overclock (both CPU and GFX). You don't think that it's better to have some reserve for uppgrades ? Please...think again. Just becouse you use you comp for "light" stuff (surfing, porn or whatever) does not mean rest of the world does the same. Some of us do play, and do some demanding work on it, that does put load on entire system.

I understand your reasoning, but how often are you going to load the ENTIRE system? Even so, going on your wattage figures, 600W would be plenty for a single GTX system, so why 750W if that's all you have?

Again, uppgrade. You ppl don't think about tomorow don't you ? How about enviroment though ? Do you think that it's good for it to buy new PSU every time one uppgrades ?

[mcoleg]

take it easy, gents.

with quad and 2x high-end vid. cards, all overclocked, a bit of a buffer on a 12v rail is a good thing. no reason to put down anyone just because they'll choose 750w psu instead of a 600-650w.

there's plenty of ppl even on this board who built light-weight systems and use overblown psu's. these are the ones who might stand some educating done to them .

Redzo, after you buy it, i hope you'll get some power measuring gizmo; would be nice to see some numbers.

[ryboto]

I understand your reasoning, but how often are you going to load the ENTIRE system? Even so, going on your wattage figures, 600W would be plenty for a single GTX system, so why 750W if that's all you have?

Again, uppgrade. You ppl don't think about tomorow don't you ? How about enviroment though ? Do you think that it's good for it to buy new PSU every time one uppgrades ?

Look at the trend of new components, power draw has peaked, and now we're on a downslope. TDP's for quad cores are sub 100W. What kind of upgrades are going to be an issue for a 400W power supply??? 3 GPU's, sure, but that's a bit more than an upgrade. Do you think about the environment? Running a 750W power supply in an idling system will waste more power than using a 350-400W unit would(assuming similar efficiency characteristics).

[mcoleg]

160w for cpu + 132w (single gtx, non-oc'ed) + 132w (2x gtx in sli, non oc'ed)

it's 424w just for cpu + vid cards alone.

one needs at least 35+ amps on a 12v rail for that. figuring in about 15% buffer to make sure psu operates in it's high-efficiency zone under load gives us 40+ amps.

without second gtx any good 4-500 watter would run this system just fine. second vid. card makes quiet a change.


as for idle loads, there was about 10-20w difference between 750w and 380w psu's i tested on my system. this is just fyi.
and for for the environment, i think the best thing would be not let any pc idle at all - either use it or switch it off

[miahallen]

Well, guys, thanks for all your input...but I think nVidia just solved my dilema with their new 8800GT. Looks like if I decide to go SLI down the road, it won't be with another 8800GTX...I'll just sell the one I have and get 2 of the new GTs...and my current PSU should still be able to handle that

[gforcefan]

With all this talk about how much power is really needed, I think some people missed an important point. Sometimes people *need* to buy a new psu. And for me at least, the cost of the 750 is virtually the same as the 620.

I have an old 520 Modstream which is starting to make various noises and I have started to get the occassional crash when playing 3d games (never use to happen). So I need want to change the PSU soon.

By most accounts, the corsair 520/620 are tops. However, Corsair introduced a new psu with a bigger fan. Ignoring wattage #'s, this could possibly be quieter and it costs the same as the 620. If it costs the same, and is actually as quiet and efficient in the actual usage range, why not go for the bigger model? My cost for the 520 is only about a $9 savings, so...

[aristide1]

Found this avalible on newegg today, looks like I found my next PSU...if it holds up to the standard Corsair has held to so far.

There is also a 650W version, here is Corsairs webpage.

These are peak numbers. Lets do some simply math. The PS is maxed out at 750 watts. If it was delivering 60amps at 12volts that alone is 720 watts, leaving just 30 watts for all the other rails.

http://www.jonnyguru.com/review_details ... page_num=2

Here are some actual tests. Test 5 in both cold and hot load tests would be a much better indicator of sustained actual max output per rail with all rails driven hard. Now the thing did sustain 50 amps, which frankly is very impressive.

These "ratings" are the same kind of "fact based fiction" that occurs on home theater receivers today. The label on the front says 7 * 100 watts, but at any given moment only 2 channels can reach 100 watts at the same time. You later see on the back of the receiver max input is 490 watts. Which means if the power supply was perfect and ignoring all other circuitry the best the receiver could output is 7 * 70 watts, which is very unlikely.

[Oklahoma Wolf]

These "ratings" are the same kind of "fact based fiction" that occurs on home theater receivers today. The label on the front says 7 * 100 watts, but at any given moment only 2 channels can reach 100 watts at the same time. You later see on the back of the receiver max input is 490 watts. Which means if the power supply was perfect and ignoring all other circuitry the best the receiver could output is 7 * 70 watts, which is very unlikely.

Not quite. Test five was a 753W load... it did just fine. That we didn't run it up to the full 60A on the 12V rail doesn't mean it can't do it, it just means we didn't ask it to at that time

It was test seven that saw the full 60A output on the 12V. Including the 1A loads on the other two rails, that still added up to 745W.

[aristide1]

Not quite. Test five was a 753W load... it did just fine. That we didn't run it up to the full 60A on the 12V rail doesn't mean it can't do it, it just means we didn't ask it to at that time

It was test seven that saw the full 60A output on the 12V. Including the 1A loads on the other two rails, that still added up to 745W.

You missed my point:
20 amps @ 3.3V = 66 watts plus
20 amps @ 5.0V = 100 watts plus
60 amps @ 12V = 720 watts plus
2.5 amps @ 5Vsb = 12 watts.

Total = 898 watts <--That is what I'm saying it can't do.

Now you can run the full 60 amps sustained with just 1 amp on the 3.3V and 5volt rails, but like other measurements in a laboratory vacuum, in the real world no pc would ever encounter such a condition. And mind you it's not just you posting these peak measurements, it's everybody, so please don't take offense.

That we didn't run it up to the full 60A on the 12V rail doesn't mean it can't do it,

Can you clarify what "we" means?