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Old 12-27-2012, 05:43 PM   #1 (permalink)
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Default Moving on UP to Crossfire

After one year of having just a single gpu, I'm making the plunge (finacially) to splurge for a second one. I'll also have to upgrade the PSU as well, and that's where my question comes in.
Currently I have:
Intel Core i7-2600k @ 4.5GHz
ASUS P8Z68-V LE Motherboard
16GB DDR3 @1600Mhz (not overclocked)
Blu-Ray Burner/Combo
1 WD 500GB 7200RPM & 1 250GB Samsung SSD (both SATA6)
HIS AMD Radeon HD 6950 2GB GDDR5
^
(Looking to purchase a second identical one.)

My current PSU is 600W, which I think was just barely enough for what I have now (idk). Various websites tell me that I should require "785W" with the second card, so I was figuring a 850W PSU should be fine. But now I'm second-guessing myself. So should I take the safe route and get a 1000W, or is 850W enough.

My budget is $180, but I guess it could be $200 if need be.

Thanks in advance for all help and advice.
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Old 12-27-2012, 05:55 PM   #2 (permalink)
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Default Re: Moving on UP to Crossfire

A regular 6950 takes around 169W by itself stock, so assuming 2 at full blast (which wont happen during gaming) they will only take 338w. Add the ~130w tdp of the overclocked 2600k and you have 468w total system power. Given the fact that you might overclock these cards one can assume a 750w GOOD quality PSU will do the trick easy. Thing is, that takes up almost all of your budget if you got something like a TX750w or even an HX750w. Are you getting one of these 6950s used?
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Old 12-27-2012, 05:59 PM   #3 (permalink)
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Default Re: Moving on UP to Crossfire

Yes, i'm bidding for a used 6950 on ebay right now. But, actually, the $180 was strickly for the PSU purchase. Either a great 850W or a good 1000W. I was looking at this on tigerdirect, what do you think?
Ultra X4 Modular 1050-Watt ATX Power Supply V2 - 1050W, 135mm Fan, ATX, 80+ Silver, Active PFC, Nvidia SLI, ATI Crossfire X, Vibration Dampener Included, Lifetime Warranty with Registration at TigerDirect.com
or is that overkill?
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Old 12-27-2012, 06:31 PM   #4 (permalink)
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Default Re: Moving on UP to Crossfire

I don't trust any Ultra PSU beyond their first iteration of modular X2s. You don't need that much power. This would do you just fine.
Newegg.com - CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply

How much are you looking to get another 6950 for? If you could fit the bill a 660ti or 670 would be better and you could retain your current PSU.
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Old 12-27-2012, 07:21 PM   #5 (permalink)
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Default Re: Moving on UP to Crossfire

Quote:
Originally Posted by PP Mguire
How much are you looking to get another 6950 for? If you could fit the bill a 660ti or 670 would be better and you could retain your current PSU.
As of right now, under $175. Are you saying that getting a GTX670 would be a better option then opting for a second 6950, or it's just a better solution if I don't want spend a lot of extra money?
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Old 12-27-2012, 08:11 PM   #6 (permalink)
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Default Re: Moving on UP to Crossfire

Both. Performance would be better and you get the benefit of 3 things:
1: Nvidia drivers. Ask Sean, they are much better.
2: No dealing with CAP or worrying if a certain game will scale good.
3: Less heat and power consumption.

After having many many multi-card setups over the past 5 years I really don't think they are as good except for e-peen.
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Old 12-28-2012, 07:19 AM   #7 (permalink)
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Default Re: Moving on UP to Crossfire

thanks for the intro PP

my 2 cents, as someone who has had crossfire 6950s...

DO NOT DO IT!!!!!!


alot of the games i wanted to play, for example, Call of duty black ops 2, simply would not run, the drivers werent supported. unless you have a slot gap between the 2 cards the top card is going to be super loud.

i just switched to a single 680 and havent looked back. my 680 performs about 40% better than my CF 6950s ( and i was unlocked to 6970s ).

take a look at my thread showing my findings when i switched to the 680
switching from the red team to the green team

less noise, WAY BETTER drivers, temps are a lot lower across the board for all my components. sell your 6950 on OCN for $200 and get your self a proper current gen card, you will like it much better...




EDIT: i didnt put enough emphasis on how CRAPY amds drivers are compared to Nvidia. ive heard about it for the couple years, " oh amds drivers suck, this and that " didnt really think of it untill i switched and used nvidias drivers, SO MUCH BETTER... not only that, when new games and applications come out nvidia updates their driers a lot sooner.... for sure read through my thread explaining my experiences after i switched!
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Old 12-28-2012, 09:25 AM   #8 (permalink)
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Default Re: Moving on UP to Crossfire

Quote:
Originally Posted by Sean W.
my 2 cents, as someone who has had crossfire 6950s...

DO NOT DO IT!!!!!!


Alright you guys have changed my mind. Thanks for the warnings and insight.
So I'm gonna go with a 680 instead.
How does this look?
Newegg.com - EVGA 02G-P4-2680-KR GeForce GTX 680 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card
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Old 12-28-2012, 11:02 AM   #9 (permalink)
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Default Re: Moving on UP to Crossfire

Looks good.
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Old 12-28-2012, 11:11 AM   #10 (permalink)
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Default Re: Moving on UP to Crossfire

Done. Purchased. Life. Happier.
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