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R9 270x crossfire or R9 270x and R9 280x in crossfire.

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  • Crossfire
  • Corsair
  • Graphics
Last response: in Graphics & Displays
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January 30, 2014 3:31:55 AM

Hi All,

I have following build.

AMD FX 8350 AM3+
Sapphire R9 270x dual-x 2GB GDDR5
Gigabyte 970A DS3 rev 3.0
Corsair Vengeance 1x8 GB DDR3 1600Mhz
Seagate Barracuda 1TB
Corsair VS650 Watts
Samsung DVD Writer
1x120mm fan, 3x120mm LED fan.

I am planning to get another card to run in crossfire. I need suggestion on,
Which will be better, two r9 270x in crossfire or r9 270x and r9 280x in crossfire?
Will my PSU be able to handle above either setup?

Thanks in advance.

More about : 270x crossfire 270x 280x crossfire

January 30, 2014 3:35:40 AM

you cannot cfire a 270x and a 280x. either 2 280x's or 2 270x's. My advice would be a single 290 and that will give you better platform to sli that later on. The 280x or 270x if you sli now thats pretty much it. You arent really gonna get more performance out of it. At least with the 290 being more powerful you could sli that in a year or two.


I see now that you already have a 270x.....Hmm then yea i might go ahead and get another and xfire it.
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January 30, 2014 3:39:45 AM

azzazel_99 said:
you cannot cfire a 270x and a 280x. either 2 280x's or 2 270x's. My advice would be a single 290 and that will give you better platform to sli that later on. The 280x or 270x if you sli now thats pretty much it. You arent really gonna get more performance out of it. At least with the 290 being more powerful you could sli that in a year or two.


I see now that you already have a 270x.....Hmm then yea i might go ahead and get another and xfire it.


Thanks for your reply. Why we cannot xfire 270x and 280x. I am planning to xfire those two for now, and in future replace 270x with 280x to get 2 280x xfire.
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January 30, 2014 3:55:56 AM

Pretty sure xfiring and sli'ing the cards basically have to be the same card. Like you could not xfire a 280x and a 290x. You cant sli a 770 and 780. Doesnt work like that.
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January 30, 2014 4:07:36 AM

and that motherboard is TERRIBLE for crossfire because it has two PCI-E X16 slots but the second one is wired to run at 4x when the first one is in use so you'll be severely crippled in performance. If you want a decent crossfire then upgrade your motherboard
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January 30, 2014 4:35:31 AM

Roxas_Boy said:
and that motherboard is TERRIBLE for crossfire because it has two PCI-E X16 slots but the second one is wired to run at 4x when the first one is in use so you'll be severely crippled in performance. If you want a decent crossfire then upgrade your motherboard


Thanks for your response. How much performance hit will I get? If I want to play games like crysis 3, metro last light, far cry 3, battlefield 4 with 60fps average at 1080p with ultra setting.
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January 30, 2014 4:37:39 AM

With 16x/4x crossfire you will get a 10-15% hit at 1080p and some games will even work better with just one card in a 16x/4x set up
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January 30, 2014 7:39:07 AM

If I upgrade my card to r9 280x in future. Will my PSU be able to run it.
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January 30, 2014 7:44:49 AM

Should yes
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September 22, 2014 6:32:44 PM

amd is different then nivida you can crossfire any r9 with another r9
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September 22, 2014 7:21:31 PM

no you can not that is a false statement.
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September 22, 2014 7:30:48 PM

azzazel_99 said:
no you can not that is a false statement.


thats why im doing it right now lol


im crossfiring a r9 270x toxic and a r9 280x toxic from sapphire
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September 23, 2014 2:36:30 PM

i have r9 270x vapour-x edition and want to do crossfire with an xfx r9 280 will that work i have corsair 750 watt psu


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September 23, 2014 2:48:26 PM

Some variations are compatible, but I'm sure you're faster card is downclocked to the slower card. The VRAM total is also equal to the card with less. You'd probably have less of a headache if you just bought another R9 270X.

http://www.hardwarecanucks.com/forum/hardware-canucks-r...
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September 23, 2014 7:43:01 PM

Rapajez said:
Some variations are compatible, but I'm sure you're faster card is downclocked to the slower card. The VRAM total is also equal to the card with less. You'd probably have less of a headache if you just bought another R9 270X.

http://www.hardwarecanucks.com/forum/hardware-canucks-r...


Im running it in msi afterbunner and it is running on two different speeds one on 280 and 1 on 270
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September 23, 2014 8:02:12 PM

your computer cannot run 2 different cards and benefit from it. The faster of the 2 always slows down to meet the slower card. Thats how it works and has always worked. If you're system is working then you are the first person i have ever seen or heard being able to run 2 different cards and them work and actually give an increase. The slower card cant do what the faster card can therefor actually slowing you down usually rather than helping.
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September 23, 2014 8:03:06 PM

you can also have 2 cards installed but until you enable crossfire/sli the cards aren't sharing the load.
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September 23, 2014 11:02:12 PM

chadillac3006 said:
Rapajez said:
Some variations are compatible, but I'm sure you're faster card is downclocked to the slower card. The VRAM total is also equal to the card with less. You'd probably have less of a headache if you just bought another R9 270X.

http://www.hardwarecanucks.com/forum/hardware-canucks-r...

would i be able to have different speeds on a saphire card (r9 270x) and an xfx card (r9 280)

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September 24, 2014 4:10:19 AM

the link listed for hardware Canucks is xfiring a 7970 and 280x which are the exact same card the 280x is just clocked higher. So of course a 7970 and 280x will work. Theory is as long as they are the same chip they can be linked but the faster card is slowed down generally to match the speed of the slower one.
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September 30, 2014 6:57:13 PM

main issue with trying to use a r9 270x with r9 280/290 is the 270x is "bottle necking" the higher card.
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