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ATI RADEON 4870 CROSSFIRE ISSUE HELP! Do i have ENOUGH POWER?

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  • Radeon
  • Graphics
  • Product
Last response: in Graphics & Displays
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January 22, 2010 1:53:42 AM

greetings, i have been coming to toms for years, and always rely on what i find here. Keep up the great work here!

My issue is this. I am wanting to add another Radeon 4870 card in CROSSFIRE mode. I have a few questions before i do. I have a Rosewill RP600V2-S-SL 600W ATX12V v2.01 SLI Ready Power Supply.

I want to know if this will be enough POWER to support another ATI RADEON 4870 or do I need to upgrade my POWER SUPPLY?? Also i wanted to know if i could use another manufactures card if i can't find the EXACT card that i have as long as the specs are the same.

Current SYSTEM SPECS:

Rosewill RP600V2-S-SL 600W ATX12V v2.01 SLI Ready Power Supply http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Hanns·G HG-281DPB Black 28" 3ms Widescreen LCD HDMI Monitor 500 cd/m2 800:1 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OCZ Gold 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) http://www.newegg.com/Product/Product.aspx?Item=N82E168...

AMD Phenom II X4 940 Black Edition Deneb 3.0GHz Socket AM2+ 125W http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OCZ Vendetta CPU Cooler

GIGABYTE GA-MA790X-UD4P AM3/AM2+/AM2 AMD 790X ATX http://www.newegg.com/Product/Product.aspx?Item=N82E168...

XFX HD-487A-ZWFC Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2x Western Digital Raptor 74GB SATA/150 10K RPM 8MB Hard Drives RAID 0

2x Western Digital Raptor 36GB SATA/150 10K RPM 8MB Hard Drive RAID 0

Western Digital 500GB Hard Drive

3 Various Fans AND

LiteOn DVD Burner


I am trying not to have to buy a new power supply, that way i can save the 100+ dollars and invest it into the new card for Xfire mode. Is Crossfire really worth the extra money? Please respond with your thoughts. I do not get new PC stuff often :) 




More about : ati radeon 4870 crossfire issue power

January 22, 2010 2:10:30 AM

Nowhere near enough power for 2 4870s, probably not even 2 4770s, its only got 35A between its 12V rails, for 2 4870s you will want a good 750 watt unit, and the old rosewills werent great so it wouldnt be a bad idea for you to upgrade to a higher quality unit anyway.

If you want to max stuff out then yes a 2nd 4870 would be worth it, if you are content with the level of details that you can play at right now then there is no reason to upgrade.
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January 22, 2010 2:35:40 AM

Hunter315, thanks so much for the fast reply.
The only reason i ask is because i have seen other posts saying that 600 is fine. So it is your opinion that a 750 watt will do just fine?

Next question is which 750watt supply do u recommend? what features or specs do i look for. i want to make sure that my system is getting all the power its needs, and maybe have some room left over just to be on the safe side.

I would also like to see other chime in on this as well. Is a 600 watt supply enough? If not whats a recommend supply in the $125 and lower price realm?

Thanks again.
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Anonymous
January 22, 2010 4:06:03 AM

Try this it may help. http://www.enermax.outervision.com/index.jsp
With the info you gave it suggest around 655 Watts on a high end PSU at min.
I have 2 systems running 955/965's with 2x 4890's in both and am running 750watt PC Power And Cooling. I would go with a 750 watt. These have been running OC'd for a few months without any power issues.


Good luck. ;) 
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January 22, 2010 5:09:15 AM

hmm, now the debate continue.. 600-750watt name brands. im thinking a 750 corsair. just want to be sure that i get what i need. Anyone else??
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Anonymous
January 22, 2010 5:13:43 AM

mentathf said:
hmm, now the debate continue.. 600-750watt name brands. im thinking a 750 corsair. just want to be sure that i get what i need. Anyone else??


There would be no problem with the Corsair unit and you would be safe with the extra wattage. And it should work for awhile even with other upgrades. Like i said i use a 750watt Unit and have had no issues. Good Luck :) 
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Anonymous
January 22, 2010 5:19:53 AM

The picture on the PSU is a vinyl graphic. The PSU comes in red. And thanks.
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January 22, 2010 5:22:35 AM

if a 650w corsair is good, a 750w corsair is better, albeit more costly. but also more future proof.
if it were me id spring for the extra 100w, but the 650 will still be adequate for CF 4870's in your machine
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January 22, 2010 4:19:37 PM

The moment I saw Rosewill, I was like "PSU problem". Do not try to run two 4870s with that PSU. You're luck it's not giving you problems with one. Anyway, I'd say go with a good 700W or above unit. Even though a 650W would be fine, I say spring for the extra wattage :D . Just make sure it has enough connectors, or you'll have to use molex adapters. I'd go with this Antec myself

Antec EarthWatts EA750 750W $109.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Two 4870s will give you performance generally around the level of the 5870. I say it's worth it and you may as well go for the second 4870 now before they are all gone.
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January 22, 2010 4:30:46 PM

i would go for the 750TX over the 650TX just so you get 4 pci-e connectors and don't have to use adapters as the 650TX only has 2 pcie cables
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