R9 280X Crossfire Compatability?

[cooleobro]

My trusted single R9 280x has served me well for playing most games but is a little lacking for VR. So, I am hoping to toss in another GPU and hook it up in crossfire with my 280x. I am aware that Crossfire is a bit more forgiving with compatibility than SLI is in terms of Manufacturer and  VRAM amounts. Obviously another 280x will work but i am wondering if a 280, 380 or 380x would work as well. I appreciate all the help I receive!

Thanks

[thekeemo]

I know a 280 will work for sure but the 280x will act like a 280 in that case.

[Benergy]

4 minutes ago, cooleobro said:

My trusted single R9 280x has served me well for playing most games but is a little lacking for VR. So, I am hoping to toss in another GPU and hook it up in crossfire with my 280x. I am aware that Crossfire is a bit more forgiving with compatibility than SLI is in terms of Manufacturer and  VRAM amounts. Obviously another 280x will work but i am wondering if a 280, 380 or 380x would work as well. I appreciate all the help I receive!

Thanks

A 280x can crossfire with another 280x, a 280, a 7970, and a 7950. 

 

Crossfiring with a 280 or 7950 will slow down the 280x to match that card though.

[-rascal-]

54 minutes ago, Benergy said:

A 280x can crossfire with another 280x, a 280, a 7970, and a 7950. 

 

Crossfiring with a 280 or 7950 will slow down the 280x to match that card though.

 

^ Pretty much what this good man said.

 

BUT, the cards are capable of running asynchronously -- meaning if you pair a R9-280X with a...say... a HD 7950, the faster card does not need to "slow down" to the the performance of the slower card.

 

Here is a good example. Keep in mind, they are running an older HD 5870 and HD 5850 in Mixed Crossfire, but the information is still valid. http://www.legitreviews.com/ati-radeon-hd-5870-5850-crossfire-mixing-video-cards_1107

 

Also, different (Core and Memory) frequencies is not a problem.

I had two HD 7970's running in Crossfire, but one was 925/1375 MHz (bone stock 7970 with Sapphire Dual-X cooler), while the other one was a clocked at 1050/1500 MHz (7970 "GHz Edition" with a Saphire Vapor-X cooler with a Tahiti XT2 core -- exactly what the 280X uses now), and there was no problems running them at their own separate speeds.

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