Which of the R7 250 version crossfire with a10 7850k ?

[FotisFTS]

So. i want to crossfire my A10 7850k with R7 250. I found this graphic card SAPPHIRE Radeon R7 250 2G D3 with 512 stream processors at 925 MHz and another one also from sapphire R7 250 2G D3 with 384 stream processors at 1050 MHz. My problem is that i have been reading a lot about this and i don't know if any of these cards are compatible. My apu's intergrated graphics are oland based with 512 stream processors. Do you know if they are cape verde based or oland based cards? Which of these two cards mentioned can give me the best possible performance boost? Which of all the R7 250 versions is the best for crossfiring? (asus, gigabyte, msi, etc )
Please i d appreciate it if you dont give recommendations for other cpus and graphic cards besides R7 250 versions for crossfiring. Thank you

SAPPHIRE Radeon™ R7 250 2G D3
http://www.sapphiretech.com/productdetial.asp?pid=EA78A741-232C-4399-B5A5-F99068D659F0&lang=eng[/u]

R7 250 2G D3
http://www.sapphiretech.com/productdetial.asp?pid=D4693F7D-75BC-482C-AB2F-909D638C838B&lang=eng

 

[APPalomares]

I am using the asus R7 250 2G DDR3 for the dual graphics technology. I'm not sure of the other brands but asus has the highest frequency so far. I think it is logical to base the performance on the clock frequency since the A10 integrated APU also depends its performance on the RAM clock frequency. If you want to make the best out of your A10 APU, go and find a DDR3 RAM with 2133Mhz. I reccomend no less than 8GB since A10 will take the 2GB as a dedicated memory for your integrated graphics.