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Is my PSU enough for the GPU in CrossfireX?

post #1 of 3
Thread Starter 
I am thinking of getting two AMD 7870 GHz Editions

I currently have this PSU
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018

Is the Rails on the back of it

I have read the review for the CF 7870 and have noted the power consumption stated in that systems test as well as the AMD home page seen here:
http://www.amd.com/US/PRODUCTS/DESKTOP/GRAPHICS/7000/7870/Pages/radeon-7870.aspx#3

http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index16.html

http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index2.html

Notice that the 500W load is the total from the entire test setup from the two linked articles. It was stated that it was running on bare minimums but that is still a somewhat hefty test setup.

I also note that the 7870 requires two six pin power connectors. My PSU only has two and I need for. I am not using most of the extra peripheral connectors on my PSU.

I know most if not all the information I need to provide to you guys. I just don't know how to interpret the amps and rails on the PSU and on the safety of using an adapter that changes periph connect to 6pin connector.

So yeah, is using an adapter for the second cards power connectors safe and does my PSU have enough power on its rails for both the cards?


My computer will be changed and re-updated for this setup and will feature
AMD Phenom II X4 965 Be (Stock Clock)
Corsair H50 Liquid AIO (two 12cm fans)
128GB SSD
Two physical hard drives (non green drives)
One or Two 12cm case fans (no led)
Disk Drive

I used to use an APC UPS with power monitor with my computer and I got an estimate of my computer (with much more fans w/ leds and more HDD's) of 150W idle and 220W Load. This was with my old 5770 as well. Just for more information for you power crunching guru's.
Edited by bowness437 - 11/23/13 at 10:29pm
post #2 of 3
theoretically yes. but with that PSU?


http://enthusiast.hardocp.com/article/2008/11/12/ocz_700w_modxstream_pro_power_supply
http://www.jonnyguru.com/forums/showthread.php?t=4989

NO!

sorry . . .
loon 3.2
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loon 3.2
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7-3770K Asus P8Z77-V Pro EVGA 980TI SC+ 16Gb PNY ddr3 1866 
Hard DriveHard DriveHard DriveOptical Drive
PNY 1311 240Gb 1 TB Seagate 3 TB WD Blue DVD DVDRW+/- 
CoolingCoolingOSMonitor
EKWB P280 kit EK-VGA supremacy Win X LG 24MC57HQ-P 
KeyboardPowerCaseMouse
Ducky Zero [blues] EVGA SuperNova 750 G2 Stryker M [hammered and drilled] corsair M65 
AudioAudio
SB Recon3D Klipsch ProMedia 2.1  
  hide details  
Reply
post #3 of 3
Thread Starter 
Quote:

All is good. I bought it on sale with a high MIR, promo reduction and instant saving price of about half its MSRP. I never expected it to be a SeaSonic. It can handle 75% capacity which is fine with me. 300W total GPU load at 100% with my system should have it at that only at some times.

And if it trips, I'll just sell my PSU and buy a new one

Still awaiting more answers.
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