KINGSTON KVR266X64C25/256 256MB 32x64 PC2100 DDR RAM - OEM
CL2.5 Six Layers High Quality Board 184-Pin Unbuffered. Requires DDR supported Motherboard - Lifetime Warranty.
N82E16820141009 $63.00
$63.00
Motherboards - AMD
Blow Out Special WOW, ECS K7S5A SiS® 735 SOCKET A MOTHERBOARD - RETAIL with On-Board LAN Port and Sound 5 PCI Slots, 1 4X AGP slot, 1 AMR slot. 2 DDR DIMM sockets and 2 DIMM sockets support (can not be used simultaneously). Two 184-pin DDR SDRAM (DDR200, DDR266) or Two 168-pin 3.3V SDRAM (PC100, PC133). Maximum: 1.0GB (DDR or SDRAM). Supports all AMD XP Processors.
N82E16813135102 $52.99
$52.99
Processors - AMD Athlon Thunderbird, XP, MP
Blow Out Special WOW, AMD Athlon 1600+/266 FSB XP PROCESSOR CPU - OEM Athlon XP 1600+/ 1.40GHz, AX1600DMT3C. The AMD Athlon XP processor with QuantiSpeed architecture powers the next generation in computing platforms, delivering extra performance for cutting-edge applications and an extraordinary computing experience.
Specifications:
CPU: 1.4 GHz
Type: 1600 XP
Cache: 256K
BUS: 266MHz
Socket A (PGA) OEM (Processor Only)
N82E16819103303 $54.99
$54.99
Video Cards
ATI OEM RADEON 9000 Atlantis 64MB DDR W/TV out NO DVI, BULKATI Radeon 9000 Atlantis Model # 1024-1197-00-SA (Video-Out NTSCL)
Features:
Graphics Controller: RADEON 9000 graphics processing unit (GPU) Memory Configuration
64MB DDR, 128-bit memory, max memory Interface: 9.6GB/s with 200MHZ DDR.
15-pin VGA connector, S-Video/composite connector
Bus Interface: AGP2X/4X
Video-Out
ATI chipset on a Sapphire video card
Graphics Performance: includes TRUFORM, HYPER Z II, SMOOTHVISION technology and supports 32-bit 3D gaming up to 2048x1536
Advanced Visual Effects: supports DirectX 8.1 features, OpenGL 1.3 applications. CHARISMA ENGINE II, PIXEL TAPESTRY II rendering engine.
Supported OS: Windows 98SE, Windows Me, Windows 2000, XP
N82E16814102234 $71.00
$71.00
Subtotal » $241.98
Add $10-20 for a cheap HSF and thermal compound.
Better graphics and memory in addition to a faster cpu. If you stick with PC100/133 memory (assuming that's what you have) it will even be within budget!
Edit: You may need a new PSU. Just like mentioned above.