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Old 12-11-2012, 02:25 PM   #1
Dain
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Smile Corsair CX430 V2 And A Graphics Solution Choice

Hello,

I have a system (spec below) powered by a Corsair CX430 V2 PSU. I want to upgrade from integrated motherboard graphics to a dedicated solution, and am currently considering Sapphire HD 7770 or 7850. AMD recommends at least 500W power supplies for both, while Sapphire lists 450W and 500W as required. My question is - can my PSU handle 7850 or 7770 in this system (this system would be kept without further upgrades for 1-2 years, used mostly on light to medium loads around 8-12h a day)?

System:
1 x HDZ965FBGMBOX: AMD Phenom II X4 Quad Core 965 Black Edition, Socket AM3, 3,4GHz, 8MB,125W
1 x CMPSU-430CXV2EU: PSU Corsair CX430 V2 430W, Builder Series, ATX, 80 PLUS, 12cm [link]
1 x 960GM/U3S3 FX: ASROCK AM3+ 760G DDR3 SATA6 RAID MATX [link]
1 x KHX1333C9D3B1K2/8G: DDR3 Kingston HyperX blu 8GB (2x4GB) 1333MHz CL9 1.5V
1 x 7200RPM HDD
1 x DVDRW

Last edited by Dain; 12-11-2012 at 02:29 PM. Reason: additional info
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Old 12-12-2012, 07:49 AM   #2
Gabriel Torres
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I'd double check using this online calculator: http://www.extreme.outervision.com/p...ulatorlite.jsp

Video card manufacturers usually exagerate on the required wattage, as they assume users will use "no brand" power supplies.

Just keep in mind that ideally you should have your power supply working at half of its labeled wattage to get the best efficiency.
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Old 12-12-2012, 10:25 AM   #3
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Thanks for the reply.

I've tried that calculator out with my components and the 7850 selected.

With these settings:
CPU Utilization (TDP): 90%
System Load: 90%
Capacitor Aging: 15%
I get the following:
Minimum PSU Wattage: 326 W
Recommended PSU Wattage: 376 W

With loads set at 100%:
CPU Utilization (TDP): 100%
System Load: 100%
Capacitor Aging: 15%
I get this result:
Minimum PSU Wattage: 377 W
Recommended PSU Wattage: 427 W

I chose the capacitor aging based on notes at the bottom of that page, honestly I don't know much about power supplies, hope that is a sane option if I want to keep the system for 1-2 years.

I'll take the results as not ideal case, but still safe to use 7850 in the system.
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Old 12-13-2012, 07:23 AM   #4
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Yes, your PSU will handle the video card, but it will be operating at 377 W, very close to its labeled wattage. I recommend, whenever you have the change, to replace your PSU with a 500 W to 650 W unit, to get a better efficiency. It doesn't need to be right away, it is something to keep in mind for a future upgrade.
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Old 12-13-2012, 01:18 PM   #5
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Hmmm, what about the Samxon caps used in those V2 Builders?
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