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4870x2 Crossfire

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January 18, 2011 2:56:44 PM

I posted awhile back about my 4870x2 crossfire issues, and I got to the point that I just stopped cross-firing them. After a little messing around, I figured out that both of my cards works as primaries without a second one, and that the 450watt 5.25in power supply for the one card will work with just one card when it is the primary. I am wondering why then that I can't crossfire without errors. I am using 10.12 drivers and same problems with all past drivers that I have tried back to 10.5. Every time it crashes it gives a ATI driver error blue screen, Atikmpag.sys. Anyone know why only in crossfire it crashes and with just one it doesn't if both cards work independently, and one with a 450watt and the system plus the other on the 850watt psu? I always thought this was a power issue, but I can't see why it is now?

Specs:

Core i7 920 3.5 Ghz
6 Gb Gkill 1333mhz RAM
30gb ssd OS
1Tb Games Drive
1.5Tb Storage
1Tb Storage
Cooler Master HAF X
Corsair 850 TX
A 450 Watt 5.25in Power Supply Powering One Card
Asus P6t Deluxe

More about : 4870x2 crossfire

January 18, 2011 3:14:31 PM

Just a bit of clarification. When you say 4870x2 crossfire. Do you mean you have two cards, or are you referring a single card in crossfire mode due to having two GPU's.
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January 18, 2011 3:27:27 PM

bystander said:
Just a bit of clarification. When you say 4870x2 crossfire. Do you mean you have two cards, or are you referring a single card in crossfire mode due to having two GPU's.


I am referring to 2 4870x2's as in quad-fire.
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January 18, 2011 3:53:47 PM

yeah well there is no way in hell you will run two of those 4870x2s with a no name 450 w psu, you are probably barley able to run 1... and what are you talking about 5.25 inch psu??? ive never heard psus being named like that, use a single psu, when you use two psu you will no doubt have problems imo... get a reputable named psu of like 750watts or more and 80+ certified, what is the make and model of the 850w, if it is legit you should use just the 850w, using two psu's for a crossfire setup is illogical if that is what you are doing, get a stronger single psu
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January 18, 2011 3:58:30 PM

tell us what make and model of 850w psu you are using, no way it will run on some cheap ass psu... (if that is what you are doing, im a bit confused)
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January 18, 2011 4:38:37 PM

I using a Corsair TX 850 Watt PSU for my rig plus one of the video cards, and I am using an expansion bay 450 watt extra psu for the other video card. I was having issues also when I was just running them both on my 850 watt, that is why I got the extra 450 watt for just one of the cards, as I thought I was having power issues, but obviously that is not the whole issue here.
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January 18, 2011 4:42:59 PM

well im understanding what you are doing and it sounds like a mess, still sounds like a psu problem even though the 850w corsair should be more than enough, maybe it is a faulty psu also?? can you test the vid cards on a different system? it sounds like you have already eliminated the gpus as a problem, i dont know but I would try another psu, maybe a bit larger 1 kilawatt, even though that should be overkill those cards do draw a lot of power from what I remember, other than that I'm not sure what to tell you other than getting a SINGLE reliable psu to run your system
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January 18, 2011 4:47:56 PM

or you could sell your 4870x2s (even though damn powerful) and upgrade to a single powerful card such as a 6970 and then crossfire down the road? a single 6970 would perform similar to your setup obviously the 4870x2s would beat it in some cases, but the scaling can;t be that great and espcially x3 and x4 gpus but i do not doubt those cards raw power but in all honesty I would much rather have a single 6970. You could probably sell the 4870x2s for maybe 120-150 a piece on ebay and then pay another 60-80 dollars and grab a 6970. you could probably run it on a decent 5-600w psu.

however without knowing if your current psu is faulty (and im speaking of the corsair) then it will be tough to use it with future or current gpus
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January 18, 2011 4:48:24 PM

The only way I can try, it in another computer is wait till I go home for spring break. My cousin has a 1200 watt psu, that I could try, and/or a 950 watt Corsair. I can try that in March, but what I get is that sometimes it works for hours and other times it is 5 minutes, and then it crashes, would that still be a power related issue?
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January 18, 2011 4:51:13 PM

jjb8675309 said:
or you could sell your 4870x2s (even though damn powerful) and upgrade to a single powerful card such as a 6970 and then crossfire down the road? a single 6970 would perform similar to your setup obviously the 4870x2s would beat it in some cases, but the scaling can;t be that great and espcially x3 and x4 gpus but i do not doubt those cards raw power but in all honesty I would much rather have a single 6970. You could probably sell the 4870x2s for maybe 120-150 a piece on ebay and then pay another 60-80 dollars and grab a 6970. you could probably run it on a decent 5-600w psu.

however without knowing if your current psu is faulty (and im speaking of the corsair) then it will be tough to use it with future or current gpus



I have been thinking about this quite a bit, and I don't think my psu is faulty if it runs my system minus one 4870x2 without a hiccup. I might try to sell my 4870x2's and get something else, I will have to think about it though.
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January 18, 2011 4:59:22 PM

heavy_metal said:
I have been thinking about this quite a bit, and I don't think my psu is faulty if it runs my system minus one 4870x2 without a hiccup. I might try to sell my 4870x2's and get something else, I will have to think about it though.



yeah give it some thought, maybe just sell one 4870x2 since you can't run it anyways and I assume in dx10 you still get pretty darn good performance in games that can utilize the crossfire at say up to 1080 or 1200p... but heading into the future, if you want to stay on the cusp of visual quality you might want to eventually upgrade to a dx11 gpu setup and imo a single card solution is always your best bet, then... when you have to, you add another card for crossfire. Perhaps this process already happened with your current 4870x2 but either way it may be time for an upgrade if you are certain that your psu is fine especially. If you have any more questions pertaining to which cards to upgrade to, etc then feel free to pm me... good luck

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January 18, 2011 5:03:27 PM

Best answer selected by heavy_metal.
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a b ) Power supply
January 18, 2011 5:28:35 PM

This topic has been closed by Mousemonkey
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