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Which PSU is best for the following system? [PSU Debate]

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November 22, 2009 8:07:41 AM

Hey I am in a PSU debate.

Right now I'm looking at three different PSU's for the following setup

Radeon 5970 (I plan on upgrading to another when the prices go down for Crossfire)
i7 920 (I plan on overclocking)
Dominator GT 1600mhz 7-7-7-20 6gb
asus rampage II extreme
150GB raptor
750gb seagate

Now for my PSU Dilemma..

I was thinking of going with the...

XFX 850W PSU

or

Enermax Revolution 850W

or

Corsair 850W

I'm looking for reliability, affordability(not overpriced.. the enermax is expensive, but is it worth it? Could I get the same price for performance with the Corsair or the XFX?) and most of all will the PSU be able to run the two 5970's in the future with overclocking going on...

so what would you guys choose?

More about : psu system psu debate

November 22, 2009 8:25:47 AM

Both the XFX 850W PSU and the Corsair 850TX/HX are excellent.
I'd say 850W are enough but that's just a guess.
November 22, 2009 9:12:31 AM

According to johnnyguru.com the 850 watt will be more than enough. The Enermax is a great psu, but for my use, I would go with the Corsair. Just my two cents and good luck with your build.
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November 22, 2009 9:26:54 AM

the xfx850 is just as good as the corsair 850hx but go on looks cuz the xfx looks loud and the hx 850 is a bit cheaper tho
November 22, 2009 9:45:09 AM

Ouch. Three excellent PSUs to chose from. Seeing as they all have the power to run the rig you'd like, you'll need to pick some other thing to base your choice on. I would look at price and warranty to make the final decision.
November 22, 2009 11:09:05 AM

I'd say Corsair or Enermax. And right now, the Enermax is available from newegg for $170 after a $70 rebate.
November 22, 2009 11:24:35 AM

If all things being equal on these 3 psus.....then all you got to go with is the best price you can get on one of these!
The only difference I see is that the Enermax has multiple 12v rails with up to 30 amps each.
The other 2 have single rails with 70 amps available....so it's up to you cause they're all excellent!
JQ
November 22, 2009 11:37:30 AM

Just read a review of the Enermax Revolution 85+ 850W and it seems to be a fantastic product. If you can get it for the price jsc has mentioned consider yourself lucky. :D 
November 22, 2009 12:12:07 PM

TheNick900 said:
Hey I am in a PSU debate.

Right now I'm looking at three different PSU's for the following setup

Radeon 5970 (I plan on upgrading to another when the prices go down for Crossfire)
i7 920 (I plan on overclocking)
Dominator GT 1600mhz 7-7-7-20 6gb
asus rampage II extreme
150GB raptor
750gb seagate

Now for my PSU Dilemma..

I was thinking of going with the...

XFX 850W PSU

or

Enermax Revolution 850W

or

Corsair 850W

I'm looking for reliability, affordability(not overpriced.. the enermax is expensive, but is it worth it? Could I get the same price for performance with the Corsair or the XFX?) and most of all will the PSU be able to run the two 5970's in the future with overclocking going on...

so what would you guys choose?






I answered with my first post the same question (other thread) but I'll keep it shorter and hopefully easier to understand!

Of course up front I admit I never understood not allowing for plenty of Power (Amps and Watts) in any new PC Build!

I've got two HD5970 (Sapphire OC versions) on Preorder but still says after Christmas so I'll have to answer with logic and the ATI advice I can find! I'm told the bare minimum for a Single UnderClocked HD5970 is 650 watts, but due to the fact these cards OC a lot I've never heard of less than advising a 750 watt PSU when using EVEN only ONE HD5970!

People must keep in mind several factors the first that low power chips were likely hand picked to keep these cards under 300 watts in testing and that's a downclocked load! That's why the 750 watts or more realistic with even LOGICAL OC of the HD5970 to the know plenty safe HD5870 speeds of 850/4800, so these cards will be a waste if left at 725mhz/4000! They easily can exceed 900mhz and run 5000mhz Ram Speed which is the RATED Speed!! Like myself you'll have to watch temps but I hear 890mhz and 4890mhz Effective Ram speed are both easy for these cards Cores!

You see most saying get the 850 watt not the 750 watt!

(The Cards While louder under High Load these Cards have 400 watt rated chamber cooling!)

I'd be shocked if an 850 watt runs the 2 HD5970 cards option you want to have just in case! I think others are assuming you will NOT need a 2nd HD5970 card! I am sure you will not now but a year from now when drivers make these cards run faster and there are DX11 games out finally keeping these incredible Cards at near Full Load a lot of the time! And OC Cards will need an extra 100 watts at least meaning the 850 watt PSU for one card not the low 750 watt! This means IF you really want to be able to crush games a year from now at incredible page rates and using 2 cards like you are thinking about already you need a lot of Power!!

Assuming 850 watt is plenty even for a Safely OC'd HD5970 then you must add at least 300 watts for a 2nd card and really 400 watts when for OC'd at those Logical OC speeds! This means to be really safe you are now at 1250 watts, well there were a few cushions already in the 850 watts for a Single Card! So I see no reason why with 1200 watt PSUs available that fit cases why you'd not get one now!! Not have to switch PSUs later when the 2nd card goes in!

1200 watts is about the realistic limit I'm told for our common 15 amp sockets, I use an Ultra X3 1600 watt model for all my builds, of course it fits in few Cases being 3 inches longer! I only use the SilverStone Timjin TJ-10 Cases mostly for the incredible Video card space, but the 1600 watt easily fits (I find the 1600 often cheaper when sold off because did not fit) Note the 13.5 inches of card length space is ideal too. These cards all have two large air intakes on the end of the cards and the HD5970 is 12 inches long, meaning any blockage is bad, but this 1.5 inches of space allows lots of air in easily!

(From what I've read about cooling I'd select a Motherboard with the 2 PCI E slots far apart not close if possible!)

The 1200 or 1250 watt realistic limit is what I've been told is all those 1600 watt PSUs can put out using an common 15 amp socket plug, it comes with 2 power cords in case you need more (which if using EyeFinity may be needed for all those monitors), an electrician can add a 20 amp later if you need it!

But in general 1200 watts is likely plenty for dual HD5970 Cards in Crossfire and both OC'd in the 890/4800 range!

That's my opinion but then I also would use a 975 EE not try to push a 920 up if you plan to have 2 HD5970 cards!

Well Regardless good luck with the Build and Holidays too!!
November 22, 2009 12:47:25 PM

actually there aint much between a i7 920 and 975



November 22, 2009 3:34:38 PM

Quote:
Assuming 850 watt is plenty even for a Safely OC'd HD5970 then you must add at least 300 watts for a 2nd card and really 400 watts when for OC'd at those Logical OC speeds! This means to be really safe you are now at 1250 watts, well there were a few cushions already in the 850 watts for a Single Card!


WTF are you talking about? Any real links/proof to back this up? 850W with enough amps to drive this is plenty, read here.

http://www.tomshardware.com/reviews/radeon-hd-5870,2422...

Two 5870s in CF, with an i7 975 at full load is how much? 561W. I'll even give you 600-650W for extra drives, etc. Just because most tell you something doesn't make it right.
November 22, 2009 3:55:43 PM

Also, the Corsair is underrated by about 100w so you'll have more than enough headroom.
November 22, 2009 11:56:48 PM

4745454b said:
Quote:
Assuming 850 watt is plenty even for a Safely OC'd HD5970 then you must add at least 300 watts for a 2nd card and really 400 watts when for OC'd at those Logical OC speeds! This means to be really safe you are now at 1250 watts, well there were a few cushions already in the 850 watts for a Single Card!


WTF are you talking about? Any real links/proof to back this up? 850W with enough amps to drive this is plenty, read here.

http://www.tomshardware.com/reviews/radeon-hd-5870,2422...

Two 5870s in CF, with an i7 975 at full load is how much? 561W. I'll even give you 600-650W for extra drives, etc. Just because most tell you something doesn't make it right.


I'm talking 5970s. not 5870s.
November 23, 2009 12:08:10 AM

Oops, missed that. Stupid single number making me look bad...

So lets see, 600W for total system, then add another 350-400 watts means your looking at around 1kW needed. You might want to go 1200W for any headroom or exotic stuff.
November 23, 2009 12:14:15 AM

damn... i really liked the XFX 850W BUT.. yea thats with 7-9 fans as well.. so what are good Reccomended 1000-1200W psus that arent that expensive?

Or how about the Enermax 950W with a setup like that?

Corsair 1000W?

BFG1200W?

Let me know,

Nick
November 23, 2009 12:15:52 AM

I know right off the Bat im going with the Radeon 5870.. 5970 is an enthusiast grade card, and I'm just looking into high-end gaming. I would pick up two 5970s probably in about a year from now.
November 23, 2009 3:54:36 AM

Sonic, that's what we meant. Yes, 850 is technically enough, but do you want your PSU running at max whenever your playing games? Getting a 1kW is a better idea, as you won't have to worry about having enough for overclocking the GPUs/CPU, adding fans/drives, capacitor aging, etc. 850 might be enough, but why run "balls to the walls" if you don't have to?
November 23, 2009 4:35:42 AM

lol, they're good
November 23, 2009 5:03:36 AM

4745454b said:
Sonic, that's what we meant. Yes, 850 is technically enough, but do you want your PSU running at max whenever your playing games? Getting a 1kW is a better idea, as you won't have to worry about having enough for overclocking the GPUs/CPU, adding fans/drives, capacitor aging, etc. 850 might be enough, but why run "balls to the walls" if you don't have to?


enermax 950?
November 23, 2009 5:29:06 AM

Enermax makes good PSUs, so I'm assuming thats a good one. More then 850 should it should be enough as well. If the price is right for you go for it. Enermax tends to be pricey, so make sure the Corsair and Antec models aren't a better deal.
November 23, 2009 8:16:28 AM

sonic-boom said:
Where is the problem???
ATI RECOMMENDS 850W FOR CROSSFIRE.
http://www.amd.com/us/products/desktop/graphics/ati-rad...

They cannot tell you one thing and it not be enough because you know how many nasty phone calls they would get???
850w Corsair is enough to crossfire 5970s.




I guess we are in the 1KW-1200 range and depends on how close you cut things, plus what deal you might find:

ATI-AMD doesn't worry about what's on the box except what sells the most, thats why since these are brand new with few reviews ans basically beta drivers my basic logic began with ATI-AMDs advice that a 1Kw was the minimum needed for Dual Cards in the 4000 series X2 cards while the Dual Cards in the 5000 series "X2"cards would use more power if OC'd much at all as advised. ATI would just tell you that PSU outout varies which it does although good ones mostly go over specs.

I've only used Ultra Cards since back years ago when 600 watts was it's biggest and it was "Modular is what?"
November 23, 2009 8:58:23 AM

sonic-boom said:
Where is the problem???
ATI RECOMMENDS 850W FOR CROSSFIRE.
http://www.amd.com/us/products/desktop/graphics/ati-rad...

They cannot tell you one thing and it not be enough because you know how many nasty phone calls they would get???
850w Corsair is enough to crossfire 5970s.





Sounds 1KW to 1200 watts ONLY IF you really want ability to run 2 HD5970 cards? Normally always a yes answer but read up on the power the HD5970 OCd at a logical OC of 890 even with lousy drivers, and recall the speed of 2 HD4870X2 cards Crossfired we a month ago thought that was overkill = a Single HD5970. I likely will only run benchmarks on the 2 on order, as I've never used more than one HD4870X2 for long term. I do not know prices of PSUs since they vary all over the place, like the 1600 I use lists at $500 but I've never paid over $320 for one. Now never over $250. The 1KW ones are around $200 or a bit less, they had no 1200 which is why I have all 1600s but just saw they have an X4 1200 now. A lot has to due with your attitude, like with Cases most are cheap with plastic molding and are throw outs and a new Case bought for every build, I view them as should be Aluminum Sturdy and able to do small and major upgrades again. This allows spending some bucks on one and the cheapest Silverstone TJ-10 shipped was $309, but they have sturdy removable MB Trays and 2 HDD removable trays. The main feature being massive airflow standard and spots to double the flow plus the 13.5" Video Card Length Limit (without removing anything like the far end 2nd mount used on some Pro Cards it has), seriously checkout some HD5970 pics to see how much of the ends are for air intake. I keep reading about squeezing the foot long card only in the largest Cases,

(Ohh I've never had an Ultra PSU go bad and the TJ-10s are tall too but mainly extremely deep!)

Back to ATI's 850 watts on the box it's more like when will a company be honest and disclose bottlenecks and limits? I even called Intel's Destop CPU support group before selling off my i7 975 EE, since when the 860 family came out Intel bragged it had more official ram throughput than the 900s? The 900s is 1066mhz they admitted seems all of them "lie".

Well as slow as I type I better end this!
November 23, 2009 12:07:13 PM

I have an corsair hx 1000 watts, lot of power, hook to that psu I have 2Xgtx295, 6 fan, 2 ssd, 3 hd, 4 external usb and 1 esata . I think with all of that I'm close to what you will have when you go cf. Go for the corsair 1000hx , one of the best in his category.
November 23, 2009 4:08:10 PM

go for anyone.....my choice enermax (cheaper)
all of them are good...hard to decide....run into anyone and u will be happy with their performance !!!!!!!
November 23, 2009 5:22:42 PM

yup
November 23, 2009 5:40:23 PM

I can get the Enermax for $200 right now but I was a little thrown off by the Warranty (3 years) and the 6 rails... are the 6 rails really a draw back? if not Ill prolly end up going with this unit.

I was also looking at the OCZ 1000W Gold (Maximum output 1268W)

And the Corsair 1000HXW has bad reviews on New egg... what's up with that?

and I REALLY like the XFX 850W because of how appealing its packaging is, XFX really does a good job to draw the consumer in lol.
November 23, 2009 5:49:49 PM

The warrant is a bit light, I thought they went longer then that. 6 rails isn't a problem, don't have any worries about that. I'm not familiar with the OCZ PSU because I don't follow them. The Corsair should have excellent reviews, what are they b!tch!ng about?
November 23, 2009 6:04:57 PM

http://www.newegg.com/Product/ProductReview.aspx?Item=N...

Scroll down and read through them, I spent about 10-15 minutes or so reading reviews in the Unit... Some good some not so great.

Check out this review of the OCZ unit. It's the worlds first GoldPLUS unit so I'm pretty sure it's efficient, but it's got a hefty price tag coming in at $299

http://www.overclock3d.net/reviews.php?/power_supply/oc...

I'm still undecided beside these units... I figure though if Im going to be dropping $1500+ why not get a good PSU...

OCZ Gold 1000W
Corsair 1000W
Enermax 850/950
XFX 850

Sigh the choices. I had this sort of debate with my cases lol and ended up going with the HAF 932.
November 23, 2009 7:15:33 PM

You have to realize though, the high quality companies downrate their PSU by up to 100watts. So when you buy a 850w Corsair, it can putout nearly 950watts, so why overkill it?
November 23, 2009 9:16:02 PM

Your worried about 10%? Which may or may not be the fault of the PSU? Take a read at this guy who gave it three stars.

Quote:
Pros: Great modular PSU with a lot of different options

Cons: I was attempting to use this to power 3 way SLI on a EVGA 3X SLI Classified motherboard. While it has two 8 pin CPU power cables (one modular, the other hard wired) and 6 PCI-E power cables (4 modular and 2 hard wired) you can't power all 4 PCI-E and the additional 8 pin CPU power due to only having 4 connectors on the PSU for that type. RMAed it the day after I received it for a BFG EX-1200 that can power all of my components without having to use adapters...


So it worked fine, but he failed to make sure it had the correct number of connectors. And because it didn't he gives a three star rating? Thats not the fault of the PSU. If you add up the poor and very poor, your at 10% of the reviews. Remember that MANY more people have used this PSU and never bothered to leave a review, so thats not 10% bad. Try to find a review of it online, I'm sure you'll find that its good.
November 23, 2009 10:43:24 PM

just used antecs wattage calculator, I got 902 watts with two 5870's in CrossFire plus everything else, with the capacitor aging at 30%... Theres no option up for 5970s yet..
November 24, 2009 3:57:03 PM

do the calculation with 2 4870x2's should be almost equal
November 24, 2009 4:09:03 PM

Let me tell u all a thing or 2 about PSU's. If u think ur pc will suck 1kw under load for the whole day and u game alot, dont u all think the electricity bill will sky rocket??? Thats because this 1000w-1250w is plain bullshit and money making.Zalman created something they never should have.The fan controller that reads out your power consumption...yup.What u should look at in a power supply is how efficient it is like the Antec Signature Series thats 87% effient so not all dissipate in just heat.Get a Zalman ZM-MFC2 Fan Controller and u will see for ur self. Overclocking hectic with loads of components and so on should have no problem on lets say a good PSU like starting 750w thats allready adiquite.Lets take a extreme thought.Motherboard with ram 6gb and some fans attached to it and sound card=150w. 2 graphics cards in xfire= 400w max.6 hdd's=60w. 2 dvd drives=20w===========so in the end we looking at 630...not near 1kw...so if u realy want to be happy and think u got the right psu get a 850w Antec Signature.The above setup in xfire would probably consume about 400w max but hey thats my guess.

I7 920 @ 3.66GHz stock volt with Coolermaster v8 cooler
Corsair ddr3 (1600 8-8-8-24) 3x2gb @ 1100MHz 6-6-6-16
Asus Eah 4890 Top 900Mhz GPU and 1000MHz ram
Antec 850w Signature
Rampage Extreme II Motherboard
1x1tb seagate
Zalman GT900 box
And lots of lights and fans

172-185w idle and 240-250w MAX under load...mmmmmm
November 24, 2009 6:55:02 PM

^^+1 right on the money. Though, I think the dual 5870s is more around 500w.
November 26, 2009 8:38:31 AM

Let's not be silly going back and forth I'm done after the below - when building a new PC or even doing a major upgrade you should be using as much extra of all items that you can afford!
(within reason as as long as it's quality and fits!)

Bare minimum watts does not take into account anything in the near future like the GT300 let alone existing Option to OverClock the HD5970 Cards Dual or Single to the 890mhz 5000 Effective Ram (Ballpark). This is "ATI's denied intent" even if downclocked for an official 300 Watt Sales rating! Also recall we (when our cards arrive) and all reviews are still using what are really still weak beta drivers. these GPUs will keep running faster with most early driver changes and then DX11 games will come along making the same GPUs work like designed to plus will need to be fine tuned and Overclcoked as much as feasible and still safe!! It's built for Massive Overclocking which will keep climbing and I don't want to advise a PSU that may likely need more power and upgraded soon ? Just to save a few bucks plus 1000s are often as cheap.

Again I want to make sure whomever builds with 2 Cards especially, allows the big end air intakes plenty of room!

Note the HD5970 not only Cools the Ram with a metal plate (passive cooling) but it also has a chamber cooler for the card front (mostly for GPUs) rated for 400 watts!! Why would a 400 watt GPU cooler be standard in every "300 Watt" HD5970 card if ATI really expects it to limp along at only 725/4000 vs 890/5000 (870 to 910 depending on your own GPUs as when made some are slower and some are faster). Use Common sense not a calculator or writing on the box for "Sales and or Legal Reasons" IF ATI really intended them to be run at a "high idle" of 725/4000?? Why would a person pay $599 for a Top of the Line Card not OCd??

We've talked the PSU size to death here! (Personally I use the same size for all builds both PSU and the deep Case too)
So lets again just say use a PSU in the 1Kw range ONLY IF you really are going to want to run 2 Cards and let your gut tell you if the small extra PSU cost for two Massive Cards is logical? Recall the 2nd Card's $599 Cost!

(I'll put these last 2 paragraphs on a CPU thread also if I can find one)

I have a CPU Question in the Family vs Family area, I'll try to find one but the Question is Simple: My QX9770 running at 4Ghz on Air is incredible 24,400 in 3DMark06 with a Single Stock Asus HD4870X2 is amazing! Which is why I sold off the i7 975 E and most Gut parts since the 32nm Desktop verions are not THAT far off I read that 900CPUs are around 35% faster, but they are never comparing to 1600 FSB QX9770 CPUs rather 1333FSB QX9650. I need a 2nd Build plus I plan 3 of them,so does anyone see a reason to build a "Faster Intel" now??

I've not used an AMD in 10 years and have the Guts for an AMD Phenom II 955 BE that seems more logical for now, so one of those to play with and as a back PC seems more logical. Plus I have the Guts and on hand and they unlike the Intel 975 is not worth the cost of selling them! BTW does anyone know what "Socket" the AMD Fusion uses when released?
!