Which PSU for QuadFire HD 4870 x2

[Xlack]

Yes Yes Card's are old! but still are amazing cards for a gamer like myself, I have read around and it says Crossfiring these cards will take up 740 Watts. At the moment I have a Non-Modular 1000w Powersupply (http://www.ocztechnology.com/ocz-proxstream-power-supply-eol.html) and a guy I was talking to said that his one would be better for the hardware I have now and can run Crossfire a lot better (http://www.cluboc.net/reviews/power/antec/TruepowerQuattro850/index.asp) My current computer specs are :

Case Fans- Cooler Master 120mm fans 2 blue led 4 black
DVD-RW - LG LG GH20NS10 Super Multi SATA Drive - 20x DVD±R, 8x DVD±RW, 12x DVD±R DL, Black
Motherboard - Gigabyte GA-EX58-UD5 LGA 1366 Intel X58 ATX
CPU - Intel® Core™ i7-920 Processor 8M Cache, 2.66 GHz, 4.80 GT/s Intel® QPI
Heatsink - Cooler Master V6GT (RR-V6GT-22PK-R1) CPU Cooler
Video Card - SAPPHIRE HD 4870 X2 2G GDDR5 PCI-E
Hard Drive - Seagate Barracuda 7200.11 ST3500320AS 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive
Power Supply - OCZ 1000w proxstream power supply
Memory - 12GB OCZ DDR3 PC3-12800 Gold Low-Voltage Triple Channel OCZ3G1600LV6GK (x2 kits) with OCZ XTC Memory Cooler

So what my real question is, Should I get the one he is req or stick with the one I have?

 

[Xlack]

Just want to add my PSU right now is Peak Power and that Antec is Continuous Power!

 

[hellfire24]

quadfire isn't a good idea IMO.4870 is 3 gen old card.BTW i would suggest at least a
1KW GOLD psu.

 

[Xlack]

Why isn't it a good Idea may I ask?

 

[Proximon]

quadfire isn't a good idea IMO.4870 is 3 gen old card.BTW i would suggest at least a
1KW GOLD psu.

This misconception has been floating around the forums lately. PSU efficiency has NOTHING to do with the rated wattage. A more efficient PSU does not mean more available power.

Crossfire 4870x2 will pull 540W of 12V power by themselves while gaming, and that would probably mean the entire system would need less than 70amps of 12V power.

http://forums.atomicmpc.com.au/index.php?showtopic=264

Now as to performance I think you will be disappointed. But go ahead and try.

 

[Xlack]

So get the new antec 850w continuous or stick with peak power 1000w?

 

[manu 11]

^^because it is really an old gen card as hellfire suggested, its no good idea to do that.
Problems like.
1. heat issues.
2.driver issues
3.power sucking
4.noise
etc

but if you have the 4 cards, the i suggest 1200w psu or 1000w minimum.

 

[Xlack]

Well i have two sapphire radeon hd 4870 x2 cards? No one has really answered my question. What power supply should i use? The antec or the one i have atm

 

[Proximon]

Your PSU is capable of 70amps of 12V power. You are OK.

 

[Xlack]

Sorry for all the noob questions haha! But 850 watt is continuous and mine is peak power so.. the 850 would always give me 70 amps and the one i have now might only give for a second. Would that matter?

 

[Proximon]

PSU guide
http://www.tomshardware.com/forum/324368-28-computer-power-supplies-guide

Recommended PSUs list
http://www.tomshardware.com/forum/322966-28-list-recommended-psus#t2430472

It would be a good idea to replace the PSU if you are really going to use them, but as I said you can give them a try first... because you are not going to see much improvement.

The worst that will happen is that your PSU will shut down.

 

[hellfire24]

see 4870 is a old card.it's 4xxx series and now AMD has released 7xxxx series.quadfire doesn't even scales well.better option is to sell your cards for a good singl card(7950) if possible.

 

[hellfire24]

@Proximon,thnx for the info buddy!

 

[Xlack]

i might trade my Card for a AMD 6970 plus some Money obv but do it? (http://www.amd.com/us/products/desktop/graphics/amd-radeon-hd-6000/hd-6970/Pages/amd-radeon-hd-6970-overview.aspx#2)

 

[Proximon]

A single 6970 would be far better than two 4870x2s.

 

[Guest]

Lol, you're very wrong. I replaced 2 4870x2s with 1 5970 and I got only 5-10% increase. 5970 is much, much better than 6970, so that means 2 4870x2 kick 6970's butt.

 

[Proximon]

This topic has been closed by Proximon