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XFX Core Edition 650W vs. 750W: which one should I buy?

post #1 of 144
Thread Starter 
Hi guys, as some of you may know, i'm willing to make a CPU upgrade to my PC, but coming from a 6 years old Core2Duo e6400 I need to change the whole platform, PSU included (i'm using a terrible unknown 600w PSU right now).
I've seen these 2 great-priced 80+ Bronze PSUs, along with a seasonic s12ii 620w which i'm discarding since it has a (slightly) smaller fan, and I wish to buy the better suited one with my config. I'd like to spare where unneeded, so I was opting for the 650w one, that for what I see could power up even a GTX 780 To with no problem (iirc), but I can't figure which of the two is the more efficient, since there are mixed results in the reviews... Would you suggest me to get the 750w to be more future-proof or is it an unneeded expense?

The 650w is 70€, the 750w is 80€.
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post #2 of 144

Your system with one GTX 780 in it with a well-overclocked CPU would never pull more than 400-425W while gaming. So, a good 450-550W PSU would be plenty. Anything bigger would be overkill unless you plan on overvolting the video card for increased overclocking potential, or if you plan on having like two GTX 780s.

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post #3 of 144
Thread Starter 
From what I read, even the 650w would be an overkill for a single card, yes, but I can't do SLI even with a 750w, even with mid-level cards such as 2xGTX 760, is that correct? (A source I used is this: http://www.realhardtechx.com/index_archivos/Page362.htm)
However, i'm planning to buy a graphics card later this year, maybe a GTX 770, not going to OC unless very later, just for longevity purposes. Right now I have a GTX 260. Would it be a waste buying the 750w? Do you have any other PSU to suggest?
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post #4 of 144
Quote:
Originally Posted by FabTheZen View Post

From what I read, even the 650w would be an overkill for a single card, yes, but I can't do SLI even with a 750w, even with mid-level cards such as 2xGTX 760, is that correct? (A source I used is this: http://www.realhardtechx.com/index_archivos/Page362.htm)
However, i'm planning to buy a graphics card later this year, maybe a GTX 770, not going to OC unless very later, just for longevity purposes. Right now I have a GTX 260. Would it be a waste buying the 750w? Do you have any other PSU to suggest?

 

The 700W recommendation is for peak-rated PSUs. The typical 700W peak-rated PSU would have a +12V capacity of 504W, which is the same as some semi-decent 550W PSUs. Check this out:

 

http://www.guru3d.com/articles_pages/geforce_gtx_760_sli_review,4.html

 

With two GTX 760s under full load, their PSU pulled 449W from the wall outlet. Their CPU was idling, so I have to add up to 150W for a well-overclocked CPU. Adding this to the 449W makes the PSU pulling 599W from the wall outlet. If we assume that the PSU is 90% efficient while pulling 599W from the wall, then that means the computer is pulling 539W from the PSU. Your gaming power draw will be lower, peaking at roughly 500W. Therefore, a good peak-rated PSU to recommend is a 700W unit, but a good quality-made PSU that can be recommended is a good 550W PSU because most of them would have a +12V capacity that's at least 540W.

 

A good rule of thumb is, multiply the professional PSU recommendation by .72. Then, find PSUs that have a +12V capacity that matches what you get, or that come close to it. That's what I did there and it worked out perfectly to 504W which is a common +12V capacity of semi-decent 550W PSUs.

 

If you want to find the amperage, then divide by 12 because it's 12V power. If all you have is the amperage and you want to find the wattage, then multiply by 12 (because it's 12V power).

 

Anyway, yeah if all you're going to do is have one video card and you'll maybe overclock it, then a good 750W would be a waste. I would say that a better purchase would be a good 450-550W PSU unless you know that you'll have two mid-range to two high-end video cards. Then, having a good 650W PSU should guarantee that you'll not only have enough power, but enough PCI-E connectors. You could use Molex to PCI-E adapters, but they can be butt-ugly. hehe

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It's a computer!
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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post #5 of 144
Thread Starter 
What do you mean for "peak-rated PSUs"? Also, do you have any experience with those particular PSUs? I'll check later if the XFX 650w is enough to support a SLI. Meanwhile, can you suggest me a valid 550w bronze PSU I can use in my config? Thanks!
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post #6 of 144
Quote:
Originally Posted by FabTheZen View Post

What do you mean for "peak-rated PSUs"? Also, do you have any experience with those particular PSUs? I'll check later if the XFX 650w is enough to support a SLI. Meanwhile, can you suggest me a valid 550w bronze PSU I can use in my config? Thanks!

 

It's enough, even for two 780s.

 

It doesn't have to be Bronze-rated, or any specific rating. That rating/certification is mostly marketing hype anyway.

 

A peak-rated PSU is a PSU that's given a wattage rating based on its absolute peak capacity. If it's a 700W peak-rated PSU, then no more than 700W would ever be able to be extracted from it. Ever. Worse, if one were to try pulling 700W from a peak-rated PSU, then it would mostly last just a few seconds before the PSU would either turn off or fail. A good continuous-rated PSU would be able to deliver its advertised wattage continuously, meaning that its peak is actually a good bit higher, like maybe 100-150W higher, sometimes 175W or more, but that's a bit rare.

 

Where are you ordering the PSU from? I can shop around to see what I can find.

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It's a computer!
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #7 of 144
Thread Starter 
I'm shopping from http://www.e-key.it.
Quick link to the xfx 650:http://www.e-key.it/prod-alimentatore-pc-xfx-pro-series-650w-bronze-80plus-pro650w-27249.htm (it's going to be available later, I think. To check if an article is on their list even if out of stock, you can Google "(product name) e-key", since their search only includes articles on stock)
I guess the vast majority of PSU are peak rated then.How can I know if a PSU is peak or avg rated?
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Zen's Canyon
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Seagate Barracuda 2TB 7200.14 LG DVD Burner Stock Cooling Windows 7 / Windows 8.1 / Lubuntu 13.04 
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LG Flatron M227WD Microsoft Wired Keyboard 600 Tecnoware Free Silent 650W  Cooler Master Mystique 631 (stripped down, bett... 
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post #8 of 144
Quote:
Originally Posted by FabTheZen View Post

I'm shopping from http://www.e-key.it.
Quick link to the xfx 650:http://www.e-key.it/prod-alimentatore-pc-xfx-pro-series-650w-bronze-80plus-pro650w-27249.htm (it's going to be available later, I think. To check if an article is on their list even if out of stock, you can Google "(product name) e-key", since their search only includes articles on stock)
I guess the vast majority of PSU are peak rated then.How can I know if a PSU is peak or avg rated?

Only cheap and crappy PSU´s are peak

The XFX Core Edition is continuous rated not peak

And you dont need more then 550 watts if you are not going to have two video cards
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Seravee
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post #9 of 144
Thread Starter 
Thank you for the precious info. So if I decide to buy the xfx core 650w PSU to do a sli later, even just for fun, would I be sure I could sli 2 gtx 770 or something similar?
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Seagate Barracuda 2TB 7200.14 LG DVD Burner Stock Cooling Windows 7 / Windows 8.1 / Lubuntu 13.04 
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post #10 of 144
If you dont go nuts with the overclocks then yes

But i dont think the XFX has more then two PCI-E cables

So if you want to add another card later you would be force to use molex to PCI-E adaptors

Edit never mind XFX says it has 4 cables
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