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Old 07-09-2008, 07:48 PM   #1
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Default PSU requirement for HD4870?

So, my friend has one of these for a psu:

http://www.newegg.com/Product/Produc...82E16817371006

Unfortunately, he wants to buy an hd4870 and that requires 2x6 pin pci-express connectors which the psu doesn't have. If we used a molex to 6 pin adaptor for the second connector, would his PSU be able to handle that kind of load? The rail amperage is sufficient and I used a wattage calculator to be sure that the system wattage is sufficient as well.
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Old 07-09-2008, 07:51 PM   #2
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Default Re: PSU requirement for HD4870?

You could use a Molex adaptor.

However I would go for a beefier PSU.

Although it depends on the rest of the system.

When you have many HD's, Optical Drives, Performance RAM, etc, you need to account for these items too.
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Old 07-09-2008, 07:52 PM   #3
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Default Re: PSU requirement for HD4870?

Quote:
Unfortunately, he wants to buy an hd4870 and that requires 2x6 pin pci-express connectors which the psu doesn't have. If we used a molex to 6 pin adaptor for the second connector, would his PSU be able to handle that kind of load? The rail amperage is sufficient and I used a wattage calculator to be sure that the system wattage is sufficient as well.
What are his other specs?

It would handle the card fine with 1x6pin + 2xmolex->6pin.
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Old 07-09-2008, 07:52 PM   #4
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Default Re: PSU requirement for HD4870?

I HIGHLY recommend this PSU: http://www.newegg.com/Product/Produc...39005&Tpk=650w

I have one myself and it powers the rig you see in my sig. It also has the 2 PCI-E connectors he needs.
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Old 07-09-2008, 07:55 PM   #5
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Default Re: PSU requirement for HD4870?

The HD 4870 requires at least a 500W power supply. He's going to need a more powerful PSU if he wants to run the 4870.
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Old 07-09-2008, 08:34 PM   #6
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Default Re: PSU requirement for HD4870?

I personnally think it would run fine. But we need to know some specs of his other components. His PSU does have dual 12V rails, both rated for 17A, which definitely isn't bad.

AMD state that the 4870's TDP is 160W, and that's the absolute max, chances are, it will never consume 160W.

And bear in mind, that when they say 500W recommended, they have to factor in all the shitty PSUs too.

He's got nothing to lose trying to run it one his current PSU.
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Old 07-09-2008, 08:44 PM   #7
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Default Re: PSU requirement for HD4870?

My friend's system is as follows:

1 x 23cm fan
3-4 x 80mm LED fans
The aforementioned PSU
Some type of Gigabyte mobo (AM2+ compatible)
AMD AM2 6000+x2 CPU
2 x Sticks of 1GB DDR2 memory
IDE CD drive
Seagate 120GB HD
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Old 07-09-2008, 08:58 PM   #8
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Default Re: PSU requirement for HD4870?

Well for that set up i'd say, bigger PSU.
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Old 07-09-2008, 09:18 PM   #9
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Default Re: PSU requirement for HD4870?

Quote:
Originally Posted by Marshillboy View Post
My friend's system is as follows:

1 x 23cm fan
3-4 x 80mm LED fans
The aforementioned PSU
Some type of Gigabyte mobo (AM2+ compatible)
AMD AM2 6000+x2 CPU
2 x Sticks of 1GB DDR2 memory
IDE CD drive
Seagate 120GB HD
Like I said, he can always try it, he's got nothing to lose.
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Old 07-09-2008, 09:24 PM   #10
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Default Re: PSU requirement for HD4870?

Quote:
Originally Posted by worshipme View Post
I personnally think it would run fine. But we need to know some specs of his other components. His PSU does have dual 12V rails, both rated for 17A, which definitely isn't bad.

AMD state that the 4870's TDP is 160W, and that's the absolute max, chances are, it will never consume 160W.

And bear in mind, that when they say 500W recommended, they have to factor in all the shitty PSUs too.

He's got nothing to lose trying to run it one his current PSU.
from what I've read, it's actually better to have one beefy 12v rail like the corsair in the above link, less lost/trapped voltage from 1 beefy rail than splitting it up into two...
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