7870 Crossfire inquiry

jvhbca · Dec 8, 2013

Hi -- Wanted to ask the experts if my system could handle 7870 in crossfire. output to one monitor:

my specs:

one diamond 7870 DD

Cooler Master Extreme Power Plus RS-700-PCAA-E3 ATX12V Power Supply. 700W EXTREME V 2.3 80% EFF G-PWR. 80% Efficiency - 700 W - Internal - 110 V AC, 220 V AC

sabertooth 900fx

fx8350

10GB of Ram 1333hz

Thanks,

Novuake · Dec 8, 2013

Not on that power supply, no, its pretty bad unfortunately.

jvhbca · Dec 8, 2013

Really? what about a TR2 700w?

quilciri · Dec 8, 2013

Novuake :

What? That PSU is great, it will support a pair of 7870's without breaking a sweat. CM's V series are built by Seasonic for crying out loud.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=360

I think Novuake was dismissing Coolermaster out of hand and didn't actually know anything about your PSU.

Novuake · Dec 8, 2013

quilciri :

That is NOT the V700. That is the standard Extreme Power Plus El Chipos...

Model number punch into CMs site :
http://www.coolermaster-usa.com/product.php?product_id=2991

On newegg :
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171054

You were saying?

quilciri · Dec 8, 2013

My mistake on the model, however your conclusion is still wrong. The extreme power plus are decent as well.

http://rbmods.com/coolermaster-extreme-power-plus-550w/3/

Novuake · Dec 8, 2013

quilciri :

Seventeam makes them.
http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913-5.html

The Extreme Power Plus on HWsecrets, which is my go to if I am unsure :
http://www.hardwaresecrets.com/article/Cooler-Master-eXtreme-Power-Plus-600-W-Power-Supply-Review/1034/9

Whole thread on tiered PSUs and on top of that a detailed section detailing CM PSUs.
http://www.eggxpert.com/forums/thread/323050.aspx

According to that they may not be utter bad quality, which is typical seventeam BUT they underperform and have some serious other flaws including ripple and are VERY unhappy with even the slightest heat.
If you pull more than 550-570W from OPs 700W PSU, then he is putting his system in serious risk.

jvhbca · Dec 8, 2013

I have a TR2 700w here, was gonna return it but may end up using it.. plus it has enough pci-e for crossfire.

i just want to make sure if i do go 7870 crossfire, ill be able to max out cod ghosts and bf4.... thats the main concern

i notice that my one 7870 is at 100% util at times in cod ghosts.. but i have it setup on extra and high on alot of the settings..

Novuake · Dec 8, 2013

MUCH better unit.

http://www.hardwaresecrets.com/article/Thermaltake-TR2-700-W-Power-Supply-Review/1422

As far as I know COD Ghosts is really bad in Xfire. The HD7990 achas LOWER lowest FPS than a single 280X.

Give that a read.
http://www.guru3d.com/articles_summary/call_od_duty_vga_graphics_performance_benchmark.html

http://www.tomshardware.com/reviews/call-of-duty-ghosts-pc-performance,3683-9.html

Geez that game is such a bad console port...

quilciri · Dec 8, 2013

The RBmods review is the one referred by Jonnyguru site for that unit, so it's pretty reliable. can't argue with erring on the side of caution with a PSU, though.

Novuake · Dec 8, 2013

quilciri :

Yeah well even that review states rippling. Although otherwise that review is not very uhm complete.

quilciri · Dec 8, 2013

Novuake :

Yes, and they also said that it has some of the least rippling for a PSU in that price range.

Novuake · Dec 9, 2013

quilciri :

Back to topic. That PSU will NOT be happy with 2 x HD7870s.

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