Can AMD Radeon R9 270X 2GB Crossfire w/ AMD Radeon R9 270 2GB?

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aaronchristopher98

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Hello, all.

So I went to a Microcenter searching for a second XFX R9 270X. Unfortunately, I could not find another 270X from XFX, but a 270 was available. I asked an employee if they would be compatible, and he asaid that if I lowered the clock speed of the 270X to match the speed of the 270, it would be completely functional for crossfire.

I went ahead and made the purchase, but I wanted to double check here before it's too late to return it. (I made the purchase out of town so I can't put it into my build yet)

Thanks.
 
Solution
Gam3r01
Its not the greatest plan, as you will essentially have two 270s in Xfire, the 270x will loose its performance edge in this configuration.
If the extra power and heat is worth it for the slight performance increase in Xfire for you, and you got a good deal, it will physically work.
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RCFProd

RCFProd

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Yeah, that could work. Same brand, same graphics cards just a different power connector and clock speed. I'm certain it should work.


I personally don't see the value on dual mid end graphics card setups though. Better off with one R9 280x.

 
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aaronchristopher98

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Thank you!

But i've heard from multiple sources that crossfire R9 270X would give more performance than a 280X. Either way, this card was on sale for an unbeatable price, so it fit my budget perfectly. I got the card that I already have in december of 2013 (I think), so I'm just now getting around to upgrading. This upgrade was much cheaper than a 280X
 
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Gam3r01

Gam3r01

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Its not the greatest plan, as you will essentially have two 270s in Xfire, the 270x will loose its performance edge in this configuration.
If the extra power and heat is worth it for the slight performance increase in Xfire for you, and you got a good deal, it will physically work.
 
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aaronchristopher98

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Couple questions:

I heard that the only decrease in performance would be losingabot 100MHz of clock speed. Is that correct?

Also, do I stay with 2GB of dedicated GPU RAM, or do I get to utilize all 4?
 
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Gam3r01

Gam3r01

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The only downsides are the clock speeds, as they are the same base chip. If you can OC your 270 to match the 270x, it would in theory be like two 270xs (But you would have less OC headroom at that point)

When in Xfire or SLI, the gpus mirror the memory they have available, two 2GB cards results in 2GB of shared memory.
 
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unseensketch30

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I have 270x in crossfire and i can tell you there is a massive proformance gain in crossfire . With one i got a average of 30 to 35 fps . With crossfire i get 80 fps at with close to every game i play on max the setup out performes a 290x .
I have a asus sabertooth gen 2
amd fx 8350 at 4.5
16 gb of vengence
ram
sound blaster recon sound card
liquid cooled setup
and im runing slight over clock on my cards
windows 8 os
in a coolmaster full tower with digital fan cooling 5 fans
1200 watt psu
and 4 hdds
500 gig for os and software programs and programing
2 tb for movies
and 2 more for steam games
my rig pushs everything at 1080p great at max
and i ran games at 4k on my 55 inch not a elite rig but those card do hold up so dont worry .
Cougar_sk8er21 @yahoo.com if you need any advice from someone with simillar cards . Also to get the most out of those card they need atleast 650 in power just for the cards in crossfire
trust me get atleast a 850 i burned up three 650s before i got the clue


 
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unseensketch30

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Also the 270 can actually be over clocked to match the 270x easy . Its on a 25 clock jump to put it at the same lvl as the 270x . Only diff is there are a few chips locked on the bored so you cant go bat shit crazy over clocking the none x version as much as a x . Also the xfx models whats makes them different is they have something set up that they clock up till they get to a certain temp and thats where the performance fain is cut off . They really need to make water blocks to push these cards farther but looks like thats a dream . Well hope i could help homie and good luck
 
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Paul17041993

Paul17041993

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270 and 270X are identical, but the X supports higher clocks. For the most part expect an average performance of 175% of a single 270 in most games, but some may be stuck to about 100%, of which games with said issue are usually low-detail anyway.

If you're lucky you could OC the 270 slightly to the same as the 270X and get a little more out of them, but the other option is to underclock the 270X to the same as the 270 to gain extra efficiency, which means [a little] less heat.

Either way though, just note that high-end graphics setups need a good amount of airflow, regardless of if its a single high-power GPU or multiple little ones. In my case (har har) I have two 180mm fans that can sometimes struggle to keep the heat from my 290X out, but simply because they're low RPM.
 
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sartorius

sartorius

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Nov 19, 2010
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Two 270s/270Xs in crossfire are about as fast as a 290. That's a rather significant jump in performance in the games that properly support CF. Power consumption would be about the same as well, which honestly isn't as much as it's so often made out to be.

All he needs to do is OC the 270 to match the 270X's speeds and he'll be set.
 
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