Have you compared the PCBs on these two cards? (sorry about the long links)
Here's the GTX 570:
http://www.newegg.com/Product/ImageGallery.aspx?CurImage=14-133-370-Z01&ISList=14-133-370-Z01,14-133-370-Z02,14-133-370-Z03,14-133-370-Z04,14-133-370-Z05,14-133-370-Z06&VSList=14-133-370-V01,14-133-370-V02,14-133-370-V03&S7ImageFlag=1&Item=N82E16814133370&Depa=0&WaterMark=1&Description=PNY%20VCGGTX570XPB%20GeForce%20GTX%20570%20(Fermi)%201280MB%20320-bit%20GDDR5%20PCI%20Express%202.0%20x16%20HDCP%20Ready%20SLI%20Support%20Video%20Card
Here's the GTX 580
http://www.newegg.com/Product/ImageGallery.aspx?CurImage=14-261-087-TS&SpinSet=14-261-087-RS&ISList=14-261-087-Z01,14-261-087-Z02,14-261-087-Z03,14-261-087-Z04,14-261-087-Z05,14-261-087-Z06&VSList=14-261-087-V01,14-261-087-V02,14-261-087-V03,14-261-087-V04&S7ImageFlag=1&Item=N82E16814261087&Depa=0&WaterMark=1&Description=Palit%20NE5X5800F09CB%20GeForce%20GTX%20580%20(Fermi)%201536MB%20384-bit%20GDDR5%20PCI%20Express%202.0%20x16%20HDCP%20Ready%20SLI%20Support%20Video%20Card
These cards look identical! Could it be possible to flash a GTX 570 to a GTX 580? Notice the GTX 570 even has marks for an 8 pin power connector, it's just not there. Could it also have the 384 bit memory bus, just running a BIOS that only uses 320 bits?
If so, I better order one quick before they sell out...
Here's the GTX 570:
http://www.newegg.com/Product/ImageGallery.aspx?CurImage=14-133-370-Z01&ISList=14-133-370-Z01,14-133-370-Z02,14-133-370-Z03,14-133-370-Z04,14-133-370-Z05,14-133-370-Z06&VSList=14-133-370-V01,14-133-370-V02,14-133-370-V03&S7ImageFlag=1&Item=N82E16814133370&Depa=0&WaterMark=1&Description=PNY%20VCGGTX570XPB%20GeForce%20GTX%20570%20(Fermi)%201280MB%20320-bit%20GDDR5%20PCI%20Express%202.0%20x16%20HDCP%20Ready%20SLI%20Support%20Video%20Card
Here's the GTX 580
http://www.newegg.com/Product/ImageGallery.aspx?CurImage=14-261-087-TS&SpinSet=14-261-087-RS&ISList=14-261-087-Z01,14-261-087-Z02,14-261-087-Z03,14-261-087-Z04,14-261-087-Z05,14-261-087-Z06&VSList=14-261-087-V01,14-261-087-V02,14-261-087-V03,14-261-087-V04&S7ImageFlag=1&Item=N82E16814261087&Depa=0&WaterMark=1&Description=Palit%20NE5X5800F09CB%20GeForce%20GTX%20580%20(Fermi)%201536MB%20384-bit%20GDDR5%20PCI%20Express%202.0%20x16%20HDCP%20Ready%20SLI%20Support%20Video%20Card
These cards look identical! Could it be possible to flash a GTX 570 to a GTX 580? Notice the GTX 570 even has marks for an 8 pin power connector, it's just not there. Could it also have the 384 bit memory bus, just running a BIOS that only uses 320 bits?
If so, I better order one quick before they sell out...