Based on comments at newegg, and a problem with the link there going to the wrong product, I though I'd let everyone know that HIS now has a Rev 2 for their X1950 Pro Turbo AGP 256/512 video cards.
Original version: http://www.hisdigital.com/html/product_ov.php?id=278
620MHz / 1.48GHz, no power cable converter
Revision 2: http://www.hisdigital.com/html/product_ov.php?id=296
590Mhz / 1.54GHz, Dual 4-pin to 6-pin power cable converter
Original version: http://www.hisdigital.com/html/product_ov.php?id=278
620MHz / 1.48GHz, no power cable converter
Revision 2: http://www.hisdigital.com/html/product_ov.php?id=296
590Mhz / 1.54GHz, Dual 4-pin to 6-pin power cable converter