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Discussion Starter · #1 ·

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Bite my shiny metal GPU!
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Quote:
Originally Posted by eyau100 View Post

Would this psu be enough to power dual crossfire 7870s?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011

Newegg's psu calculator says I need a 750w psu, but the calculator here in the forums says I only need 525. Which one should I trust?
You could easily run 2x 7870s on the linked PSU. In terms of which "calculator" to trust, I'd lean towards the latter. Without knowing what the rest of your rig contains, I'd speculate that somewhere in the 600-650w range would be sufficient. An excellent model in that range would be Rosewill's CAPSTONE-650-M.
 

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Discussion Starter · #4 ·
Hi thanks for the fast reply. I prefer a fully modular psu because of the easier cable management. I currently have a ASUS HD7870-DC2-2GD5. I'm planning to either get the GIGABYTE GV-R787OC-2GD or the SAPPHIRE 100354XTL .
 

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Discussion Starter · #5 ·
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Originally Posted by svenge View Post

You could easily run 2x 7870s on the linked PSU. In terms of which "calculator" to trust, I'd lean towards the latter. Without knowing what the rest of your rig contains, I'd speculate that somewhere in the 600-650w range would be sufficient. An excellent model in that range would be Rosewill's CAPSTONE-650-M.
The rest of my build is listed in my "first build" rig.
 

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Discussion Starter · #8 ·

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Discussion Starter · #9 ·
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Originally Posted by svenge View Post

I see. That Rosewill I recommended is semi-modular (fixed 24-pin and 8-pin CPU), but I found a couple fully-modular 650w units.

OCZ ZT 650w (OCZ-ZT650W)
Seasonic X Series 650w (SS-650KM)
I think I'll go with the seasonic one. Thanks for saving me money
biggrin.gif
That money will go towards a 120mhz monitor.
 

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Discussion Starter · #13 ·
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Originally Posted by Hogwasher View Post

I'm running two 7950's off my 850 watt hive
That's more than enough for me to run mine then. Thanks
biggrin.gif
 

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If you have enough clearance and 3 slots between graphics cards to support it, the HIS IceQ model with the semi-open blower heatsink might be better for a Crossfire config, as that can pull in air from both top and bottom, and it should exhaust more heat outside of the case than an open-air cooler. With two relatively open-air coolers, you can get a lot of hot air recycling between cards; case airflow needs to be a bit more careful unless you don't mind the high temps and noise.

I mean this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161404

I've never used one and YMMV regardless. Just a thought.
 

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Quote:
Originally Posted by mikeaj View Post

If you have enough clearance and 3 slots between graphics cards to support it, the HIS IceQ model with the semi-open blower heatsink might be better for a Crossfire config, as that can pull in air from both top and bottom, and it should exhaust more heat outside of the case than an open-air cooler. With two relatively open-air coolers, you can get a lot of hot air recycling between cards; case airflow needs to be a bit more careful unless you don't mind the high temps and noise.

I mean this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161404

I've never used one and YMMV regardless. Just a thought.
Youre really telling him not to buy the hawk? The most overly built 7870 for a HIS?
 

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Discussion Starter · #16 ·
Quote:
Originally Posted by mikeaj View Post

If you have enough clearance and 3 slots between graphics cards to support it, the HIS IceQ model with the semi-open blower heatsink might be better for a Crossfire config, as that can pull in air from both top and bottom, and it should exhaust more heat outside of the case than an open-air cooler. With two relatively open-air coolers, you can get a lot of hot air recycling between cards; case airflow needs to be a bit more careful unless you don't mind the high temps and noise.

I mean this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161404

I've never used one and YMMV regardless. Just a thought.
Thanks I'll definitely keep that in my considerations.
 

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Quote:
Originally Posted by Stay Puft View Post

Youre really telling him not to buy the hawk? The most overly built 7870 for a HIS?
Hawk is much better in general of course, but it is over $40 more (if money were no object, why not a better PSU than even X Series?) and will dump more heat back into the case. On the flip side, about $50 is the difference between a lower-end 120 Hz monitor and a more decent one, e.g. Acer GD235HZbid to Asus VG248QE.

Depends on priorities and usage, like most things. You can always get the premium option at every point, but whether or not that fits the needs or the budget is a different matter.
 

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Discussion Starter · #19 ·
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Originally Posted by SilentAD View Post

I'm not entirely sure on if you ever got around to Crossfire and what PSU to go with but here's my current setup and results from Unigine Heaven:

GPUs: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150605&RandomID=4733410824824812620130329071849

PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263&Tpk=capstone%20650-m&IsVirtualParent=1

Hey, thanks for the reply. I got the seasonic x750 psu but I might not even get around to the crossfire setup because I read that if you run games in windowed mode, crossfire gets disabled.
 
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