dout if any of my stuff will go with the new mobo .. its over 4 years old . saying that it is pci-e , but from what harb was talking about on wow is that the connectors may not be the same .. Im pro noob with the inside

ok here is what i have just now ..
AREA-51
1 | ALIENWARE FULL-TOWER GREEN CASE 1.5
1 | INTEL D925XCV 925X MOTHERBOARD BLKD925XCVLK
1 | INTEL PENTIUM 4 530 3.0 1MB L2 CACHE 800MHZ FSB LGA775 EJ
2 | SAMSUNG 512MB DDR2 PC4200
1 | 16X DVD-ROM
1 | SEAGATE BARRACUDA 120GB 8MB CACHE SERIAL ATA WITH NCQ HD
1 | 1.44MB FLOPPY DRIVE BLACK
1 | US ROBOTICS V.92 56K PCI MODEM
1 | INTEL INTEGRATED HIGH-DEFINITION AUDIO
1 | ATI RADEON X850 XT 256MB PLATINUM EDITION PCIE
1 | MOUSE PAD
1 | ALIENWARE MASTER CD
1 | MICROSOFT WINDOWS XP HOME
1 | SYMANTEC GHOST CORPORATE VERSION 8 (LICENSE)
1 | ALIENADRENALINE: VIDEO PERFORMANCE OPTIMIZER
1 | CYBERLINK POWERDVD 8 CHANNEL 7.1 XP
1 | ALIENWARE CORE BINDER MANUAL
1 | 480 WATT POWER SUPPLY
1 | SET UP POSTER
1 | 36" INTERNAL TO EXTERNAL USB CABLE
1 | SATA DATA CBL 60 CMS ST TO R ANGLE
1 | CABLE MANAGEMENT
1 | ALIENICE INTAKE BLUE FAN
1 | BLUE LED ALIENHEAD
1 | DUAL COLD CATHODE BLUE LIGHT KIT
2 | IDE CABLE 80 WAY
1 | PCI-EXPRESS 6-PIN INTERNAL POWER CABLE ADAPTER
1 | POWER SPLITTER HD/CD 1x 5.25" to 2x 5.25
1 | CARD KEEPER PCI
1 | ALIENWARE RESPAWN RECOVERY KIT ENGLISH
1 | 2-YR 24/7 WARRANTY
1 | CUSTOMER SUPPORT WARRANTY (NO CHARGE)
1 | PERIPHERALS
1 | PINNACLE INSTANT CD/DVD OEM
1 | GREEN INTELLIMOUSE EXPLORER 4.0 USB
1 | UK - EU POWER PLUG ADAPTOR
1 | LOGITECH BLACK INTERNET KEYBOARD UK
1 | NEC MULTISYNC LCD1770NX-BK 17" LCD MONITOR