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Need Professional Advice on Crossfire Rig...

post #1 of 38
Thread Starter 
I'm wanting to Crossfire 2 x 6870 Video Cards and was thinking this would probably need about 800 watts on an Overclocked i5-750 System...

What I want to know is which PSU would you select, with PRICE as a major consideration, note though, I don't want junk either!

I want something that is at least 80+ Certified (If not bronze or silver certified), but I know that this is no indicator of how good the PSU is overall, again I don't want junk...

What I'm looking for is the best deal with Quality being the most important factor.

So if you guys can make some recommendations, and if the wattage is too low/high then let me know...

Thanks in advance..
Edited by _GTech - 2/18/11 at 10:30am
The Rock
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post #2 of 38
Thread Starter 
Ok, here is where I will be posting PSUs I am currently looking at.

(NOTE: You will need to come back and check this later as I update it based upon input below!)

SILVERSTONE ELEMENT ST65EF 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply ($100)

CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply ($90)

Thermaltake Toughpower XT TPX-675M 675W ATX 12V v2.3 / EPS 12V v2.91 SLI Certified CrossFire Certified 80 PLUS BRONZE Certified Modular Active PFC Power Supply ($120)

Antec EarthWatts EA-650 GREEN 650W ATX12V v2.3 SLI Ready CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply ($90) (This looks like a cheap PSU, dont' know if it's good, anyone?)

Those are the only ones I could find that looked either good or half way decent... YOUR THOUGHTS PLEASE?
Edited by _GTech - 2/18/11 at 12:19pm
The Rock
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post #3 of 38
before someone goes all fan boy on you, It's crossfire lol

Check this Corsair PSU

and take a look here for grand wealth of knowledge for PSU
Dorianime
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Dorianime
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post #4 of 38
Thread Starter 
Quote:
Originally Posted by Dorianime View Post
before someone goes all fan boy on you, It's crossfire lol

Check this Corsair PSU

and take a look here
hehe, doh!

I'll take a look thanks, +Rep for the recommendations

Conclusion..

Corsair = $170, not good..

Phaedrus2129 Writes great articles, read all of his stuff, he is extremely knowledgeable..
Edited by _GTech - 2/18/11 at 10:33am
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post #5 of 38
conclusion ati uses crossfire and you only need 600 odd watts

Antec TruePower New TP-650 650W
Ultra mega
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post #6 of 38
No problem man
looks like you switched out SLI by the time i was done typing

also if i had to recommend one i'd probably choose the thermal take over a brand i haven't heard from and rosswill

But Do take a good read at phaedru's pages it will help you a lot in your decision making. I've once bought a bad PSU out of poor education and regreted so the second time around i made damn sure i got my info straight
Dorianime
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post #7 of 38
Quote:
Originally Posted by obsidian86 View Post
conclusion ati uses crossfire and you only need 600 odd watts

Antec TruePower New TP-650 650W

80% percent out of 650 is roughly 530 so he's looking for at least 750 psu

800-850 watt will just give him some head space
Dorianime
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Dorianime
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post #8 of 38
Thread Starter 
Quote:
Originally Posted by Dorianime View Post
80% percent out of 650 is roughly 530 so he's looking for at least 750 psu

800-850 watt will just give him some head space
Exactly, under supplying voltage/amperage to my rig is something I want to avoid at all cost...

I think 800 Watts would be a good range, but I wasn't 100% sure..

I may be able to get by with say a 750 Watt if it was 90% efficient..

421 Watts for Crossfire 6870 + OverClocked Rig + 2 1TB HDD in RAID... (Add for 2 X 120mm Extra Fans)

671-721 True watts needed? Anyone know for sure?
Edited by _GTech - 2/18/11 at 10:49am
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post #9 of 38
Firstly, the four units you listed in an earlier post are all mediocre units.
A good 650W unit would be perfect for the system you have in mind. If you don't feel comfortable with 650W for whatever reason, 750W would be the maximum sensible wattage.
Here are some recommendations.

1) Antec TruePower New units -- the prices on these are excellent and they're among the very best units on the market currently.
http://www.newegg.com/Product/Produc...82E16817371021
http://www.newegg.com/Product/Produc...82E16817371025

2) XFX units -- all are made by SeaSonic and perform very well.
http://www.newegg.com/Product/Produc...82E16817207010
http://www.newegg.com/Product/Produc...82E16817207007 (modular)
http://www.newegg.com/Product/Produc...82E16817207009
http://www.newegg.com/Product/Produc...82E16817207003 (modular and extremely cheap while being one of the best 750W units on the market -- 10% off w/ promo code PSU11FEB, limited offer)
post #10 of 38
Thread Starter 
XFX Black Edition P1-750B-CAG9 750W ATX12V v2.2 / ESP12V v2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power Supply

That power supply looks extremely nice, but the color omg... the color...

So I think the other one you listed, which looks nicer & cost less...

XFX Core Edition PRO750W (P1-750S-CAB9) 750W ATX12V v2.2 & ESP12V v2.91 SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply

Would be a great choice indeed, tanks +Rep...

On the other hand the Antect PSU you recommended has A LOT of deffective product reviews, so I cannot attest that these are good based upon the buyer reviews, which scared me to even touch Antec now, this is a premium power suppy too, wow...

Any other recommendations anyone?
Edited by _GTech - 2/18/11 at 11:16am
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