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Help me realize how big of a PSU I need - Page 4

post #31 of 46
X750 is 89.99 AR now. I'm using this PSU now and am very happy with it. I'm running 3930K at 4.6GHz and two GTX 670 SLI OCed at 1240MHz in water cooling.

It's a bit old model (I think seasonic replaced this withnew X760 for some reason...) but still this is a good deal.

http://www.overclock.net/t/1363081/newegg-seasonic-x750-gold-psu-for-89-99-ar

Also, I can guarantee (believe it or not...) that you will have no problem with 750W power.
post #32 of 46
Quote:
Originally Posted by Colorful Dan View Post

I can spend as much as I need to, my personal friend told me 750 should be good too, but there's always that small part of me that's nervous and doesn't want to waste time and money having to upgrade again...sadsmiley.gif
If you buy a good 750W such as the X-750 you will never have to upgrade your PSU again unless it breaks/the standards for connectors change.
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post #33 of 46
Quote:
Originally Posted by TwoCables View Post

I don't see how $174.98 shipped is a great price when you can get the X-750 for about $105 if you're on the mailing list (that's what Dan said).
20% promo code puts it at $141 shipped

currently codes on quite a few units

the 850 kingwin plat is at $146 shipped which is a better deal if he wants to
Edited by obsidian86 - 2/21/13 at 11:11am
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post #34 of 46
Thread Starter 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207017

^^^This is 105 right now after rebate and coupon, thoughts? these seem to look pretty cool;)
post #35 of 46
Quote:
Originally Posted by ./Cy4n1d3\. View Post


Well, you should know PSU's are the most efficient at around 50% load. So if most of the time your PSU is at 50% load, then you have the right PSU. There is no bad thing for having a bit of head room.

Personally, I would say a 750 or 850w PSU.

It's 85%, where did you get that 50%?
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post #36 of 46
Quote:
Originally Posted by Colorful Dan View Post


I can spend as much as I need to, my personal friend told me 750 should be good too, but there's always that small part of me that's nervous and doesn't want to waste time and money having to upgrade again...sadsmiley.gif

 

When I review my calculations, a quality-made 750W seems perfect for overclocking the 7970s:

 

http://www.guru3d.com/articles_pages/asus_radeon_hd_7970_crossfire_review,7.html

 

With two 7970s under full load in their system, their PSU pulled 567W from the wall outlet.  Their CPU was idling, so I have to add 150W for a 3770K at 5 GHz under full load.  So adding 150W to 567W makes the PSU pulling 717W from the wall outlet, and so if the PSU is 85% efficient while pulling 717W from the wall outlet, then the system is pulling 609W from the PSU.  This is unrealistically high because I'm saying the 7970s and the 3770K are completely maxed out simultaneously, plus I'm saying the 3770K is at 5 GHz and pulling 150W.  Your actual gaming load will be about 500-525W on average.  Therefore, a quality-made 650W would keep your average power draw right in the sweet spot which maximizes your PSU's efficiency.

 

So, a nice 750W PSU leaves plenty of room.

 

 

Quote:
Originally Posted by Whalemeal View Post

X750 is 89.99 AR now. I'm using this PSU now and am very happy with it. I'm running 3930K at 4.6GHz and two GTX 670 SLI OCed at 1240MHz in water cooling.

It's a bit old model (I think seasonic replaced this withnew X760 for some reason...) but still this is a good deal.

http://www.overclock.net/t/1363081/newegg-seasonic-x750-gold-psu-for-89-99-ar

Also, I can guarantee (believe it or not...) that you will have no problem with 750W power.

 

Omg, I didn't notice the Promo code!  Holy [beep]!

 

 

Quote:
Originally Posted by obsidian86 View Post


20% promo code puts it at $141 shipped

currently codes on quite a few units

the 850 kingwin plat is at $146 shipped which is a better deal if he wants to

 

Yeah, but that's still $141 vs. $89.99 for the X-750.

 

 

Quote:
Originally Posted by Colorful Dan View Post

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207017

^^^This is 105 right now after rebate and coupon, thoughts? these seem to look pretty cool;)

 

Meh, not when you can get the X-750 for $89.99!

 

 

Quote:
Originally Posted by adridu59 View Post


It's 85%, where did you get that 50%?

 

Either from other people, or from this article below.  lol

 

On PSU Efficiency

 

Either way, I think it all stems from this article.

 

Here's what people aren't reading but should:

 

PSU "50% Load" Myth

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post #37 of 46
Just get a 750w. Corsair, SeaSonic, XFX, NZXT are just a few good brands to go with. There are more but my mind isn't with it at the moment.

I like the deal on the XFX you posted. That is what I would go with personally.

EDIT: Even the 750w XFX would be good
post #38 of 46
Thread Starter 
Just so everyone know's I am still struggling with which PSU to choose. I am leaning toward the 750 Seasonic, just because it is perfect for what I need, but the 850 XFX looks prettier and I'm still struggling to believe in 750. But I will make my decision tonight and probably side with Seasonics, especially at 89.99!thumb.gif
post #39 of 46
Quote:
Originally Posted by Colorful Dan View Post

Just so everyone know's I am still struggling with which PSU to choose. I am leaning toward the 750 Seasonic, just because it is perfect for what I need, but the 850 XFX looks prettier and I'm still struggling to believe in 750. But I will make my decision tonight and probably side with Seasonics, especially at 89.99!thumb.gif

It's always a struggle but they are both great PSUs, just go with what you want and can afford. The more you save the more that can go for other things you might need.
post #40 of 46
Quote:
Originally Posted by Colorful Dan View Post

Just so everyone know's I am still struggling with which PSU to choose. I am leaning toward the 750 Seasonic, just because it is perfect for what I need, but the 850 XFX looks prettier and I'm still struggling to believe in 750. But I will make my decision tonight and probably side with Seasonics, especially at 89.99!thumb.gif

 

Not to be a broken record, but:

 

When I review my calculations, a quality-made 750W seems perfect for overclocking the 7970s:

 

http://www.guru3d.com/articles_pages/asus_radeon_hd_7970_crossfire_review,7.html

 

With two 7970s under full load in their system, their PSU pulled 567W from the wall outlet.  Their CPU was idling, so I have to add 150W for a 3770K at 5 GHz under full load.  So adding 150W to 567W makes the PSU pulling 717W from the wall outlet, and so if the PSU is 85% efficient while pulling 717W from the wall outlet, then the system is pulling 609W from the PSU.  This is unrealistically high because I'm saying the 7970s and the 3770K are completely maxed out simultaneously, plus I'm saying the 3770K is at 5 GHz and pulling 150W.  Your actual gaming load will be about 500-525W on average.  Therefore, a quality-made 650W would keep your average power draw right in the sweet spot which maximizes your PSU's efficiency.

 

So, a nice 750W PSU leaves plenty of room.

 

I just wasn't thinking after I encountered all of your fear and doubt.  I must not be very well rested if it clouded my judgment too.  :)

 

So yeah, $89.99 for the X-750 is a much better deal than the deal on the 850W XFX unit.  The X-750 is a top-of-the-line fully modular PSU, and that means it's easier to have good cable management and it's easier to install.

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