i've tried the latest version of SdBOOT(4,8beta,slot B) on my wii(not modded)+GamecubeLauncher+wiikeySD(i think it's identical to SdGecko)
+Panasonic Sd 4class, 2 Gb. I've the DvdX library installed for the WiiLoader(it means they don't interfere)
GamecubeHomebrewLauncher Run only at 480i...