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Can I use an updated (UEFI ready) GTX680 in a NON UEFI mobo (ASUS P6x58D premium)?

Maegirom
Level 7
Hello everyone. Here Mario from Spain, sorry if my english is a bit bad...
Now I have an ASUS GTX 680 direct cu2 TOP, running in an "old" P6x58D Premium mobo. Everything works OK.
I have the chance to purchase a second GTX 680 top to make a SLI, but it's updated with UEFI BIOS. The FAQ reads that "olds" ASUS NON UEFI mobos are tested until 4 years old. Actually I don't know when P6x58D premium was released, so: Anyone knows if I can use the second GTX680 in SLI updated with this UEFI BIOS in my mobo? (Note that one GPU will have the UEFI bios, and the other not)

IN CASE AFIRMATIVE: I have to put the 2nd GTX in the pcie slot 3. It is supposed that then I'll run at x16 and x1, what it's non viable, BUT I have found in BIOS the option to convert pcie slots 2 and 3 from x16 / x1, to x8 / x8. It is supposed then that the SLI would run at x8 / x8 in slots 1 and 3 then? I don't nevermind this since it's just a couple of frames loss, right?

Thanks to all.
Regards from Spain.
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