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Author_25
04-27-2010, 01:10 PM
Hi,

Is a Corsair HX850 enough to power the following?

Intel i7 930
Asus Rampage III Extreme
2x Asus GTX 470's
Corsair 6GB Dominator 1600
3 Hard Drives
2x Laing DDC 3.25 pumps
9 Noiseblocker XL2 fans

HuffPCair
04-27-2010, 01:25 PM
I would say yes, but I am not 100% since I dont really know what the 470s take to run. Havent really read up on them.

The HX850 can take a beating though. One of the best PSUs made. I will use mine till it dies on me.

avddreamr
04-27-2010, 01:38 PM
More than likely yes. But remember your pumps and fans are going to consume 60watts!! :)

Author_25
04-27-2010, 01:40 PM
Both the Asus and nvidia websites do not list the power consumption for the 470 GTX but found the information at, http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10 (http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10), and the power consumption on idle averages 160 watts and under load is 341 watts for a single card.

Hardware Canucks provided information on a 470 SLi setup.

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX470_SLI/GTX470_SLI-75.jpg

HuffPCair
04-27-2010, 01:48 PM
wow almost 350 watts for each card good god. So there is almost 700 watts alone.

Hmmm I would say if you have the money and it wont hurt you. Maybe go with a 1000w just to be safe, but maybe wait to see if someone who knows more to chime in.

PiLsY
04-27-2010, 02:01 PM
Thats total system load at the ac outlet, NOT card wattage.

HX850 will be fine. Could probably cope with twin 480's at a push.

Author_25
04-27-2010, 02:07 PM
Thats total system load at the ac outlet, NOT card wattage.

PiLsY thanks for pointing that out.

Missed that completly and should always read the fine print or in my case the large lettering that states, "Total System Power Consumption".

HuffPCair
04-27-2010, 02:08 PM
Thats total system load at the ac outlet, NOT card wattage.

HX850 will be fine. Could probably cope with twin 480's at a push.

ah ok. Thanks for that info.

Learned something today

rge
04-27-2010, 02:35 PM
I have corsair HX850, playing with kow meter with i950 OCed to 4.7 ghz, dual gpu gtx 295 to 730 core, and I have 2 ddc 3.2, 18 fans (some with leds/higher wattage), 3 hard drives, when running coredamage on cpu (max power draw cpu, it is higher than linx/prime) and furmark on dual gpu simultaneously, I can only draw 670W from the wall. And that is way further than any realistic load, and even if power supply is 90% efficient that means system use is 600W.

Even if your gpus do put out another 120W than my OC dual gpu 295, you are still fine even with crazy OC's and simultaneous furmark and coredamage.

Like Pilsy said, you even have more headroom. One site recommended 850 corsair for an overclocked 470 sli or 750 for standard clock 470 sli...here: http://www.hardocp.com/article/2010/04/27/gtx_480_470_power_supply_unit_buying_guide/4

Waterlogged
04-27-2010, 09:28 PM
Both the Asus and nvidia websites do not list the power consumption for the 470 GTX but found the information at, http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10 (http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10), and the power consumption on idle averages 160 watts and under load is 341 watts for a single card.

Hardware Canucks provided information on a 470 SLi setup.

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX470_SLI/GTX470_SLI-75.jpg

Following links are just for GFX cards only, so use them with discretion.

http://www.xtremesystems.org/forums/showthread.php?p=4329485#post4329485

^It doesn't contain any Fermi info but does a good setup for the link below.

http://www.behardware.com/articles/787-1/report-nvidia-geforce-gtx-480-470.html Power draw is on pg5.

antiacid
04-28-2010, 12:12 AM
Both the Asus and nvidia websites do not list the power consumption for the 470 GTX but found the information at, http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10 (http://www.bit-tech.net/hardware/graphics/2010/03/28/nvidia-geforce-gtx-470-1-1280mb-review/10), and the power consumption on idle averages 160 watts and under load is 341 watts for a single card.

Hardware Canucks provided information on a 470 SLi setup.

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX470_SLI/GTX470_SLI-75.jpg


If it is measured at the wall, then you have to factor in the efficiency of your PSU as well.

I don't think I've seen any reviews with power metered at the card for the new gtx470/480. I might just not have good memory at 3:15am though ;)

millsy_c
04-28-2010, 02:49 AM
If it is measured at the wall, then you have to factor in the efficiency of your PSU as well.

I don't think I've seen any reviews with power metered at the card for the new gtx470/480. I might just not have good memory at 3:15am though ;)

http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_470/28.html they have it there, only single card but it's just GPU wattage.
GTX470 gets:
29w @ idle
150w @ avg (average 3d load)
171w @ peak load
232w @ furmak load
45w @ bluray load

So yeah at worst that's 464w from the cards stock, i'd imagine your hx850 will be fine :up:

Author_25
04-28-2010, 04:55 AM
Hi All,

Thanks for the links they have been very helpful and from looking at the power consumption for a GTX 470 it appears that a 850W PSU should be more than enough.

I do have one question in regards to the 8 pin EPS/12V connector. The Rampage III Extreme has 2 8pin EPS sockets. Would using a 8pin EPS to molex adapter on a dedicated PSU cable be OK?

gmat
04-28-2010, 05:24 AM
If it is measured at the wall, then you have to factor in the efficiency of your PSU as well.
That means the actual system load is *lower*.
So for a SLI of 470's, a 750W PSU will be way enough (factoring a hungry, overclocked, fully loaded CPU at the same time).
For two 480's a 850W unit will do perfectly fine:
(from behardware) "For information, in terms of the system as a whole, we got 173W at idle and 497W in load for the GeForce GTX 480 and 263W at idle and 784W in load for a pair in SLI."
784W external power with say, 85% efficiency that's 666W rated on the PSU.

Author_25
04-28-2010, 06:42 AM
Found this excellent tool, eXtreme Power Supply Calculator (http://www.extreme.outervision.com/PSUEngine), that allows you add in the overclock you are aiming for as well as the components you will be using.