Manque de memoire

Bonjour,
voila je voudrais améliorer les performances de mon vieux pc , mais je sais pas si je dois ajouter ou remplacer et quel type de memoire il me faut
je joins un rapport de ce que le pc a dans son "ventre"
je vous remercie d'avance pour vos conseilsCPU-Z Report

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CPU-Z version 1.33.1.

CPU(s)
Number of CPUs 1

Name Intel Pentium III EB
Code Name Coppermine
Specification Intel Pentium III EB 666MHz
Family / Model / Stepping 6 8 3
Extended Family / Model 0 0
Brand ID 2
Package Socket 370 FC-PGA
Core Stepping cB0
Technology 0.18 um
Supported Instructions Sets MMX, SSE
CPU Clock Speed 664.5 MHz
Clock multiplier x 5.0
Front Side Bus Frequency 132.9 MHz
Bus Speed 132.9 MHz
L1 Data Cache 16 KBytes, 4-way set associative, 32 Bytes line size
L1 Instruction Cache 16 KBytes, 4-way set associative, 32 Bytes line size
L2 Cache 256 KBytes, 8-way set associative, 32 Bytes line size
L2 Latency 0
L2 Speed 664.5 MHz (Full)
L2 Location On Chip
L2 ECC Check enabled
L2 Data Prefetch Logic no
L2 Bus Width 256 bits

Mainboard and chipset
Motherboard manufacturer Compaq
Motherboard model 0664h,
BIOS vendor Compaq
BIOS revision 686J1 v3.08
BIOS release date 03/15/2000
Chipset Intel i810E rev. A3
Southbridge Intel 82801AA (ICH) rev. 02
Sensor chip SMSC 5604

Memory
DRAM Type SDRAM
DRAM Size 64 MBytes
CAS# Latency 2.0 clocks
RAS# to CAS# 2 clocks
RAS# Precharge 2 clocks
Cycle Time (TRAS) 5 clocks
Bank Cycle Time (TRC) 7 clocks
# of memory modules 1
Module 0 SDRAM PC125 - 64 MBytes

Software
Windows version Microsoft Windows XP Professional (Build 2600)
DirectX version 8.2