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post #11 of 37
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
I am focusing on it, but you're not trusting me. Actually, you're not appreciating what I'm saying.

I'm sorry, but it looks like you only came here to have someone tell you that you should do what you want to do (I know that you are just asking a simple question, but I like it when someone shows me that I can spend less money). It also looks like if anyone agrees with me, then you'll just tell them to go away too.

Seriously: what are the chances that you'll make that big of an upgrade? To power your system with even two 6970s in it, you will only need a quality 650, maybe 700W at the most. So think about what you can buy with the money you'll save by buying the X-650 instead of the HX850 or X-850.

Don't let the wattage rating of these PSU's fool you. When AMD recommends 650W for two 6970's in Crossfire, they're including PSUs that have a "Peak" rating of 650W. But the power supplies we are looking at have a "continuous" rating of 650W.

But y'know what, I apologize for being interested in enabling you to spend less money. So here's my reply to the original question:

The X-850 is a superior unit in quality, has better efficiency (when the load isn't less than 50% on it like I mentioned before), and it's fully modular. But the HX850 is fine too. However, both are technically a waste of money unless you are absolutely 100% sure that you'll replace the two 6970s with something that requires much more power. Or, if you decide to add a third 6970. But you'd have to be absolutely 100% sure that you'll do it.
Sorry if I offence you, I have no intention to make anyone angry here, I'm just asking question.

I might go for 750w, but I won't go for 650w.
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post #12 of 37
It's just that I've been here every single day for a full 2 years now, and I've discovered that it's usually rare for someone to follow through with their upgrade plans. This usually causes them to end up using a PSU that's way too much overkill for 2-4 years which means that their efficiency probably never exceeds 80% which means their power bills were always higher than they otherwise could have been. But of course, they also spent more money on the PSU than they otherwise could have spent.

So I mean how long will you stick with the two 6950's?
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It's a computer!
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post #13 of 37
I wouldn't get an X-750. Get the HX750 instead - lower ripple, faster transient response, lower price with the same warranty. Just sacrifice some efficiency.
post #14 of 37
Quote:
Originally Posted by TwoCables View Post
Absolutely!

http://www.amd.com/us/products/deskt...verview.aspx#3

It says 500W is recommended to power a system with a single 6950, and even though they don't show the recommendation for a system with two 6950s in it, I can say this: every single time I have seen 500W recommended on their site, 600W was recommended for a system with two of the cards in Crossfire.

For example:

http://www.amd.com/us/products/deskt...verview.aspx#3


Then there's this:

http://www.amd.com/us/products/deskt...verview.aspx#3

It recommends a 550W to power a system with a single 6970 in it. So given the extremely high quality of the X-650, I'm 100% confident that it'll be perfectly fine.
God why i purchased 950w PSU then
I was planning to CFX my 6870
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post #15 of 37
Quote:
Originally Posted by NrGx View Post
I wouldn't get an X-750. Get the HX750 instead - lower ripple, faster transient response, lower price with the same warranty. Just sacrifice some efficiency.
I thought that this difference was between the AX850 and the HX850. I mean if what Phaedrus2129 says is true, then the HX750 is among Corsair's best and "contend with the likes of the SeaSonic S12D/M12D 750W/850W and the XFX 750W/850W". I mean, the X-750 is certainly superior to all of those units, right?

Quote:
Originally Posted by Colt View Post
God why i purchased 950w PSU then
I was planning to CFX my 6870
Whoa. Even a quality 550-600W would power a system with two 6870s in it:

http://www.amd.com/us/products/deskt...verview.aspx#3
It's a computer!
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It's a computer!
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
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 #16 of 37
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
It's just that I've been here every single day for a full 2 years now, and I've discovered that it's usually rare for someone to follow through with their upgrade plans. This usually causes them to end up using a PSU that's way too much overkill for 2-4 years which means that their efficiency probably never exceeds 80% which means their power bills were always higher than they otherwise could have been. But of course, they also spent more money on the PSU than they otherwise could have spent.

So I mean how long will you stick with the two 6950's?
Probably 2 years or more. I just want to stick with the PSU for my next upgrade that's why I choose higher W PSU, just to be sure than it'll last long.
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post #17 of 37
Quote:
Originally Posted by NrGx View Post
I wouldn't get an X-750. Get the HX750 instead - lower ripple, faster transient response, lower price with the same warranty. Just sacrifice some efficiency.
HX750 is a CWT DSG unit, and in the 750W range the X platform is clearly superior in every way but transient response.

At 850W then it's a toss-up, but at 750W the X750 beats out the HX750 every time.
post #18 of 37
One thing to consider is that everything is getting more efficient and requiring less power for more performance as the generations go on, meaning you will need less psu for more advanced graphics and processors in the future. Look at GTX580 vs 480 or Sandy Bridge vs old i7's.
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post #19 of 37
Isn't the AX850 the same unit as the x850? If so that's cheaper than the x850.
    
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post #20 of 37
Quote:
Originally Posted by HGooper View Post
Probably 2 years or more. I just want to stick with the PSU for my next upgrade that's why I choose higher W PSU, just to be sure than it'll last long.
REALLY, an X-650 or even a TX650 would be plenty to suit your needs and beyond.

Just because there's high wattage PSUs on the market, doesn't mean your system needs one. In fact, just about no one needs more than 450W.
Edited by TheLaw - 1/10/11 at 8:22pm
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