1 x 5870 to 2 x 5870.. CGMINER HELP

[qqriice]

Hi

Currently I have 1 x 5870 using CGminer @ 410khash stable

Using:  c:\cgminer\cgminer.exe --scrypt -o stratum+tcp://give-me-ltc.com:3333 -u x -p x --thread-concurrency 8000 -shaders 1600 -I 17 -g 1 -w 256 (GPU 900 MHz / MEM 1085 MHz) - stable 24/7 @ 68 C

Question:

After I install my second 5870;

1. if i use crossfire what change needs to be made to the above command?
2. if i do not use crossfire what change needs to be made to the above command?

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[qqriice]

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