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PSU suggestion for i7 build gtx 275 SLI or GTX 295

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  • Build
  • Gtx
  • Intel i7
  • Systems
Last response: in Systems
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July 31, 2009 3:04:44 AM

Hi guys. I have been wanting to build a new PC based on the Core i7 to replace my 5year old machine p4 2.8 Northwood. However I am not sure on what PSU to get. I am leaning over corsair but I don't know which wattage to get. Please help. I've done my research and website seems to give different results. I not much into overclocking but I do play a lot of games. Do you have any suggestions on the PSU? How about my build can you spot the not so good choices?

http://educations.newegg.com/tool/psucalc/index.html
Newegg says I should get 1000w PSU

Thermaltake says otherwise
http://www.thermaltake.outervision.com/Power
The website says I should get a
Thermaltake seems says get Toughpower 650W



Core i7 920
Asus P6t
Prolimatech Megahalems cooler (2 Noctua fan)
Corsair 1333 3x2GB memory
2 HDD 7200rpm SATA
HAF 932 casing
BFG GTX 275 (2x) or GTX 295
Liteon DVD-RW/DVD+RW Drive


Thanks.



More about : psu suggestion build gtx 275 sli gtx 295

July 31, 2009 3:22:31 AM

Check out this website... http://extreme.outervision.com/psucalculatorlite.jsp

I think you will be fine at 750w but if you are thinking you might need 1000w.. get the Corsair 850w PSU. What HDD's are you picking up?


Side note: Pick youself up a 8-pin extension cord for your PSU. You will need it for good cable management.
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July 31, 2009 3:27:06 AM

I have these two from my old rig.

1 320GB Seagate Baraccuda 7200rpm SATA
1 1TB Seagate Baraccuda 7200rpm SATA

So basically this setup would be final, I don't think that I am going to add other stuff to the machine after this build.

Thanks for the tip i would definitely look out for the 8-pin extension cord for your PSU.

So do you think either way a GTX 275 SLI or GTX 295 would fit the 750 W PSU?
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July 31, 2009 4:12:57 AM

+1 for the 750W...But instead of the Thermaltake, get the Corsair 750TX...
And as for the graphics card, 2x GTX275 SLI would beat the GTX 295 in performance...but the GTX 295 would consume less power...
But the idea of getting one now is better because DirectX 11 cards are coming and the GTX275 has enough power for running the current games @ upto 1920X1200 resolution without much problems...
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July 31, 2009 4:45:33 AM

What resolution will you play at?
If it is 1920x1200, then the GTX275 will play most games well.
If it is 2560x1600, then you might want GTX295 or sli GTX275.

The simple way to size a psu is to look at the number and type of pci-e 6 and 8 pin connectors that you need in total.
A single GTX275 will need 2 6-pin. double that for sli.
The GTX295 will require a 6 pin plus an 8 -pin.

Most QUALITY psu's that have those connectors will have sufficient amperage to drive them.
Corsair, PC P&C, Seasonic, and Antec to name a few.
I favor PC P&C for their good support, but Corsair seems to be priced right currently.

For a single strong card, a 550 or 600w unit will be good.
For sli, a 750w unit will be about right.
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July 31, 2009 5:09:27 AM

Currently i am using a 32" LCD TV for my monitor I had one at home so I decided to just use them both for TV and PC. It has HDMI so i think i would be connecting my PC to the TV via HDMI 1080i which i believe has a 1920x1080i. Response time is 8ms.

Ok I'm decided then i'll just purchase a Corsair 750w PSU rated at 80plus

Thanks guys. You've been a great help!!!
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July 31, 2009 5:31:48 AM

Thanks jbakerlent for the memory suggestion, this is 4GB memory i'm looking to buy 6GB. Will this still do a triple channel mode.

for the http://extreme.outervision.com/psucalculatorlite.jsp psu calculator i think this is the same with the thermaltake calculator. Same interface too. Anyway they produce the same result which suggest around 650 W. But as you said 750 would be the right spot.

I am not really familiar with the great advantages of a card being dx11 ready and I think it will be 2010 before DX11 is officially launched. After that you have to wait a long time for DX11 games to come out.

I am planning to buy 2 GTX 275.

to gkay09:
GTX 295 cost at around $507 here in our country and about $263 for the GTX 275. so when you compare both is just about the same price. So would you suggest that I buy a GTX 295 rather than the GTX 275 SLI for future proofing my system?
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July 31, 2009 5:36:21 AM

DO NOT USE THE DUAL CHANNEL OCZ PLATINUM WITH AN i7

The voltage it requires to achieve the rated speed is well above the tolerance on the i7, use the triple channel kit as it stays at the required 1.65volts
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Going for 2 GTX275s give you more bang and the option to triple SLI in the future, where as the GTX295 brings you up to quad SLI which doesnt scale too well. But by the time you need more than 2 GTX275s there will be much stronger GPU's out there to switch to.
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July 31, 2009 5:40:09 AM

@excaliburq as I had said 2x GTX 275s in SLI perform better than a single GTX 295...
But if you want to stay away from the clutter of 2 graphics card, the the GTX 295 is a good option...

But on the other hand, why not first give a single GTX 275 a try...they are powerful enough to run the current games @ that resolution...
If you feel they are sufficient, then it would be good as you can save money for the DirectX 11 cards (ATI will be launching the cards within this year)...But if you feel they are insufficient, then add one more GTX 275...So you are not gonna loose anything anyways... ;) 
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July 31, 2009 5:50:45 AM

+1 To gkay09 and hunter315 very well said. I'll try 1 GTX 275 first and find out for myself if it fits my needs. Thanks a lot guys.
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July 31, 2009 5:58:58 AM

Hi, I have the exact same system other than the ram, even my case is the same. Im using a corsair tx750w without any problems, I have overclocked my cpu to 3.78 GHz and also oveclocked the graphic cards with out any problems. :)  hope this helped
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July 31, 2009 6:03:13 AM

with 1 gtx 275? or SLI? what memory did you use?
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July 31, 2009 6:07:03 AM

no, using 2 275's. the ram is kingston 1033 (dont know why i chose it)
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July 31, 2009 6:08:37 AM

click on my sig to view my parts using the corsair tx750
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July 31, 2009 6:35:16 AM

gkay09 said:
+1 for the 750W...But instead of the Thermaltake, get the Corsair 750TX...
And as for the graphics card, 2x GTX275 SLI would beat the GTX 295 in performance...but the GTX 295 would consume less power...
But the idea of getting one now is better because DirectX 11 cards are coming and the GTX275 has enough power for running the current games @ upto 1920X1200 resolution without much problems...


when you guys say buy one 275 and wait for the dx 11 cards, does that mean he will have another card equivalent to the gtx275? So he would have a gtx275 sli with a dx11 card? What do you mean?
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July 31, 2009 6:42:07 AM

^ When we say buy 1 GTX 275 - it implies that it would open up the options for either going with the newer DirectX 11 cards(with the money saved not buying the second GTX 275) if they are better(Generally the next gen cards would have a good performance bump compared to the current gen cards...

So instead of 2x GTX 275s, a single next-gen card could offer similar performance)...

If they are not as good, then add another GTX 275 in SLI...
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July 31, 2009 7:18:16 AM

Ahh ok i get it. well in the past new card upgrade experiences would the "gtx 375" be that much better than 275?
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July 31, 2009 7:22:32 AM

^ If they get the basics right, then maybe it would...

If you take for example the current gen cards and previous gen cards ->
GTX 275 and 8800GTX
The GTX 275 can easily hold up against the 8800GTX SLI...And it just costs 1/3 the price of the 8800GTX, when the GTX was released...
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July 31, 2009 6:21:39 PM

excaliburq said:
Thanks jbakerlent for the memory suggestion, this is 4GB memory i'm looking to buy 6GB. Will this still do a triple channel mode.

for the http://extreme.outervision.com/psucalculatorlite.jsp psu calculator i think this is the same with the thermaltake calculator. Same interface too. Anyway they produce the same result which suggest around 650 W. But as you said 750 would be the right spot.

I am not really familiar with the great advantages of a card being dx11 ready and I think it will be 2010 before DX11 is officially launched. After that you have to wait a long time for DX11 games to come out.

I am planning to buy 2 GTX 275.

to gkay09:
GTX 295 cost at around $507 here in our country and about $263 for the GTX 275. so when you compare both is just about the same price. So would you suggest that I buy a GTX 295 rather than the GTX 275 SLI for future proofing my system?

OUCH i just got a gtx275 of newegg for $199.00 before a mir. im leaning to towards late september/early october for DX11 cards but that is a while. i would get the gtx295 based on your budget and the price of the cards where you are. if you needed you could always buy another 295 when the dx11 cards come out and prices drop...
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