I've got a Pioneer DVR108 and have just burnt a couple of ISO files to 16x DVD-R's using DVD Decrypter. In my old system (P4, Intel chipset mobo) once i had flashed the 108 with the latest firmware it burnt them at 16x (once on the outer edge!) however in my new system (DFI Lanparty Ultra-D, Opteron 146) it will only burn up to around 11x on the same DVD-R's (16x rated) and the write speed seems to vary quite a bit at any point on the DVD-R were as before at various parts of the burn it was relatively stable at 8x, 12x etc. Also the device buffer seems to be going up and down alot once it gets over about 50% written (device buffer drops to 20% then up to 100%, then down to 20% etc etc rather quickly) and i dont recall it doing this on my old setup! Any any ideas why this is? Is it a driver problem (using XP SP2 were as my old system used XP SP1), would uninstalling the drive and rebooting thus allowing XP to find the drive again make any difference? I'm also using the latest NF4 chipset drivers. TIA for any help.