Would this system be noticeable faster

Hello everyone . I have a question regarding the purchase of a new pc for my son . He currently has a Hp d4650e with 2 gb ram - 400 gb hard drive- ATI 1600 series graphics card (256 mb ram) -- Cd/Dvd r/rw combo - Windows XP Pro - AMD 5200+ dual core . Now, the system he is looking at has the following specifications :

General Spec New PC
Brand iBUYPOWER
Model GX-923L
Recommended Usage Gaming
Form Factor Tower
Processor Intel Core 2 Quad Q9550(2.83GHz)
Processor Main Features 64 bit Quad-Core Processor
Cache Per Processor 12MB L2 Cache
Memory 8GB DDR2-800
Hard Drive 500GB SATA
Optical Drive 1 20X DL DVD+/-RW Drive
Optical Drive 2 16X DVD-ROM Drive
Graphics NVIDIA GeForce GTX 260 896MB HDCP Ready Video Card
Audio Realtek ALC883, 8-CH High-Definition Audio CODEC
Ethernet Built-in GB Ethernet LAN
Power Supply 800W
Operating System Windows Vista Home Premium 64-bit
Software Included MS Office 2007 [60-Day Trial]
Special Features Gigabyte Poseidon Gaming Tower + Blue Color Lighting CPU Liquid Cooling System
Motherboard Chipset NVIDIA nForce 750i SLI
Motherboard Name ASUS P5N-D Mainboard
CPU Type Core 2 Quad
Installed Qty 1
CPU FSB 1333MHz
CPU Speed Q9550(2.83GHz)
L2 Cache Per CPU 12MB
CPU Socket Type LGA 775
CPU Main Features 64 bit Quad-Core Processor
Graphics
GPU/VPU Type NVIDIA GeForce GTX 260
Graphics Interface PCI Express x16
Memory
Memory Capacity 8GB DDR2 Memory Speed DDR2 800
Form Factor DIMM 240-pin
Memory Spec 2GB x 4
Memory Slots (Available/Total) 0/4
Maximum Memory Supported 8GB
HD Capacity 500GB
HD Interface SATA
Optical Drive Type DVD±RW
Optical Drive Spec 20X DL DVD+/-RW Drive
Optical Drive 2 Type DVD-ROM
Optical Drive 2 Spec 16X DVD-ROM Drive
Audio Chipset Realtek ALC883
Audio Channels 8 channels
LAN Chipset Integrated
LAN Speed 10/100/1000Mbps
Front Panel Ports
Front USB 2
Front Audio Ports 2
Back Panel Ports
COM 1
LPT 1
PS/2 2
Video Ports 2 DVI
TV Out 1 x HDTV / S-Video Out
Rear USB 4
Rear IEEE 1394 1
RJ45 1 port
Rear Audio Ports 6 ports
S/P DIF 1 x Coaxial S/PDIF out
1 x Optical S/PDIF out
Expansion
External Bays 5 x external 5.25" drive bays
2 x external 3.5" drive bays
Internal Bays 3 x internal 3.5" drive bays
PCI Slots (Available/Total) 2 x PCI-Express x16
2 x PCI-Express x1
2 x PCI

Would this new computer be a whole lot faster than his current setup?