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How many amps/watts do I need for (2) 4870

4080 Views 42 Replies 24 Participants Last post by  Heavy Light 117, 
H
Will be replacing the cards in my sig rig. Thanks for the input.
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W
Sapphire says:
500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)
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KarmaKiller
You could get by with a quality 600w-700w PSU, and have a little headroom.
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H
Would my current PSU be enough?
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W
It should be enough, but it's nice to have some "head room"
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Juggalo23451
Quote:

Originally Posted by Heavy Light 117 View Post
Would my current PSU be enough?
yes
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KarmaKiller
Yes, I think your PSU is enough also.
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Acoma_Andy
2
Quote:

Originally Posted by Heavy Light 117 View Post
Would my current PSU be enough?
Yeah it should be ok, how old is it though? Unlike a good wine, they don't get better with age
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H
2
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Originally Posted by Acoma_Andy View Post
Yeah it should be ok, how old is it though? Unlike a good wine, they don't get better with age

Less then a year old...
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S
Quote:


Originally Posted by Heavy Light 117
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Will be replacing the cards in my sig rig. Thanks for the input.

Each card runs about 160w idle, and around 260w full load.

To not stress your PSU, get one rated 700w or higher, preferably 800w. Will give you some future proofing, too.
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M
your power supply should be fine
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Rook_
Your PC Power and Cooling will probably be okay with that setup, but if you have some extra cash and you're interested in upgrading, Newegg has the Corsair 850TX for 99.99 after MIR with Free Shipping, I just picked one up.

Promo Code: EMCLPML49
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linskingdom
The 4870 is a 150W GPU. With CF scale and OC, 2x 4870 needs 270w/23A from 12v alone.
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Brythe
People should stop over stating power requirements. Your PSU will be more than fine.
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S
Quote:

Originally Posted by linskingdom View Post
The 4870 is a 150W GPU. With CF scale and OC, 2x 4870 needs 270w/23A from 12v alone.
Idle. Around 260w full load.

For 2x ATI recommends...

http://ati.amd.com/products/radeonhd...uirements.html

Quote:
650 Watt or greater power supply with one 2x3-pin PCIe® power connector and one 2x4-pin PCIe® power connector is required (1K Watt with two 2x3-pin and two 2x4-pin connectors for ATI CrossFireX™ technology in dual mode)
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M
Wish I had a killawatt to tell you. I am 100& sure that your pwersupply can handle it. No need to go above 650watt if you are looking for upgrade.
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linskingdom
2
Quote:

Originally Posted by StarryNite View Post
Idle. Around 260w full load.

For 2x ATI recommends...

http://ati.amd.com/products/radeonhd...uirements.html
Understand.
That's total wattage for psu but we should focus on what the actual wattage/amps on 12v beside the total wattage of psu. That's really matter to GPU and CPU. Im my op, the 270w is for GPU CF itself on 12v alone but not the whole number for the system.
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L
That PCP&C PSU will be fine for that setup. People really do overstate power requirements. I was thinking about "borrowing" a second GTX 295 once mine comes in from step up and try to fold on both of them and the CPU on my 750w PSU. That'll be cutting it really close, but it's more of an experiment than anything.

Quote:


Originally Posted by StarryNite
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Each card runs about 160w idle, and around 260w full load.

To not stress your PSU, get one rated 700w or higher, preferably 800w. Will give you some future proofing, too.

They don't use 260w each under load, that's crazy. My GTX 280 doesn't use that much power. 160w is more like it for the 4780, for a load draw.

It seems like all you do is go around the various threads and just post false information. Do you have any proof of your claims? You DO realize a 260w load is impossible with two PCI-e 6 pins and the power the slot supplies, correct?
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M
2
Quote:


Originally Posted by linskingdom
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Understand.
That's total wattage for psu but we should focus on what the actual wattage/amps on 12v beside the total wattage of psu. That's really matter to GPU and CPU. Im my op, the 270w is for GPU CF itself on 12v alone but not the whole number for the system.

Question for ya. How much amps does 1 4870 and 2 each situation need?
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S
Quote:


Originally Posted by ljason8eg
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It seems like all you do is go around the various threads and just post false information. Do you have any proof of your claims? You DO realize a 260w load is impossible with two PCI-e 6 pins and the power the slot supplies, correct?

I gave you proof Jason, and I'm going to ask you to not post to me again, as you can't behave civily.

270 Watt For The Performance Crown: AMD's Radeon HD 4870 X2

http://www.tomshardware.com/news/AMD...4870,6108.html

Now, take your GTX knowledge back to the Nvidia forum before you ruin someone's rig.
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