500w gpu on 450w (peak power 550w) suply

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joej970

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Apr 2, 2013
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Hello :)
I am new on this forum ;)

My problem:

I have this power suply:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817233010

Actually is 450w for normal use and 550w peak power. I dont know how to say, khm... I hope you understand...

So, can I run this graphic: http://www.dinokomp.si/product_info.php/cPath/44_67_354_904/products_id/216

Its sapphire radeon hd7870 with tahiti le (i think) and it is recommended to have 500w...

So, what you think? Is there enough suply for stable operating?

Greetings
 
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MauveCloud

MauveCloud

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May 7, 2010
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Several issues with that power supply:
1. Gigabyte brand is not listed in the Tiered Power Supply List: http://www.eggxpert.com/forums/thread/323050.aspx
2. Passive PFC (active is better)
3. Only has one PCI-E power connector (that video card requires 2)

This page says a normal HD 7870 requires 23 amps on the +12V rails:
http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards

Your Gigabyte power supply indicates it can deliver a total of 360W across the two +12V rails, which comes out to 30 amps, but given the issues I mentioned above, I wouldn't trust it to run that video card.
 
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imomun

imomun

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Feb 17, 2013
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Theres two aspect to this, capability&reliability
The maximum tdp of the 7870 tahiti le is 185W
And if you got a sandy/ivy platform with standard comonents eg dvd rom 1 HDD SDD another 150W max
So That Ggabayte is more than capble as SR-71 Blackbird said.

But I think MauveCloud got a point aswell that is actualy how reliable it can be given it will see a use of 60-70% of its capability.
Quality PSUs dont skip on important features and uses japanese caps etc which increases PSU life and less chance of an accident.
But that also doesnt mean your PSU is bad or will fail in a year, even best quality PSUs can fail.

Threfore if OP already has The Gigabyte unit He can consider the options.

Thanks
 
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ko888

ko888

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Feb 18, 2009
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For a system using a single reference clocked Radeon HD 7870 Boost Edition graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 33 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The GIGABYTE Superb 550P (GE-P450P-C2), with its maximum combined +12 Volt continuous current rating of 30 Amps and with one (6+2)-pin PCI Express supplementary power connectors, is insufficient to power your system configuration with a single Radeon HD 7870 Boost Edition graphics card.

From ht4u.net's review of the Sapphire Radeon HD 7870 XT with boost 2GB GDDR5:

Total graphics card Power Consumption only, measured at the graphics card's PCI Express slot and PCI Express Supplementary power connectors:
FurMark: 215.24 Watts
Gaming Load: 188.48 Watts

Graphics card Over Clocked to 1150 MHz Core boost clock, 1650 MHz Memory clock:
FurMark: 279.92 Watts
Gaming Load: 214.4 Watts
 
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J

joej970

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Apr 2, 2013
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@imomum: I have i7 870 (Lynnfield), it uses 95w. and 2 hdds, 1dvd rom and 3 fans.

@MauveCloud: I think you need 2 connectors per card if you have cross fire, for single card will be enough if you have only one.. am I right?

so, what can happen if I use card with this psu? can I destroy graphic card or something else?
I am planning to buy card and psu later if there will be need.. what you think?
 
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