qual a mémoria ram compatível com o meu sistema ?

quero comprar uma memória ram pro meu computador só que eu não sei qual eu devo comprar tem que ser da mesma frequência que a minha ? para vocês analizarem o meu sistema de uma olhada abaixo o meu pc :

256 mb
DDR2-SDRAM PC2-4300 (266 MHz) – [DDR2-533]
A0 (RAS 0) : 256 (Single Bank)
A1 : Empty
A2 : Empty
A3 : Empty
agora da placa mãe :
Mainboard : Asus P5VDC-TVM

Manufacturer : ASUSTeK Computer INC. (Asus)
Product : P5VDC-TVM
Version : 1.XX
****** Number : 123456789000
Support MP : Yes, 1 CPU(s)
Version MPS : 1.4

Chassis Information :
Manufacturer : Chassis Manufacture
Type : Desktop
Version : 1111
****** Number : EVAL
Asset : 123456789000

OEM Support SLIC :
SLIC : No

Sensor Information :
Hardware Monitoring : ITE IT8712F

On-Board Device Information :
Embedded Controller : No

Slots Information :
Slot PCI : In Use (32-bit) 5.0v
Slot PCI : Available (32-bit) 5.0v
Slot PCI : Available (32-bit) 5.0v
Slot AGP 8X : Available (32-bit)

agora é da placa mãe :

General Information :
Manufacturer :ASUSTeK Computer INC. (Asus)
Product :P5VDC-TVM
Version :1.XX
Serial Number :123456789000
Support MP :Yes, 1 CPU(s)
Version MPS :1.4

Chassis Information :
Manufacturer :Chassis Manufacture
Type :Desktop
Version :1111
Serial Number :EVAL
Asset :123456789000

OEM Support SLIC :
SLIC :No

Sensor Information :
Hardware Monitoring :ITE IT8712F

On-Board Device Information :
Embedded Controller :No

Slots Information :
Slot PCI :In Use (32-bit) 5.0v
Slot PCI :Available (32-bit) 5.0v
Slot PCI :Available (32-bit) 5.0v
Slot AGP 8X :Available (32-bit)

External Connectors :
Serial 16450 Compatible :DB-9 male
Serial 16450 Compatible :DB-9 male
Parallel ECP/EPP :DB25 female
Keyboard :PS/2
Mouse :PS/2
Video :DB-15 female
Audio :Mini-jack (headphones)
Audio :Mini-jack (headphones)
Network :RJ-45
FireWire (IEEE P1394) :1394
FireWire (IEEE P1394) :1394

Internal Connectors :
PRIMARY IDE :On Board IDE
SECONDARY IDE :On Board IDE
FDD :On Board Floppy
COM1 :9 Pin Dual Inline (pin 10 cut)
COM2 :9 Pin Dual Inline (pin 10 cut)
LPT1 :DB25 female
PS/2 Keyboard :PS/2
PS/2 Mouse :PS/2
Line In :
Line Out :
Mic In :
CD In :On Board Sound Input from CD-ROM
Aux In :On Board Sound Input from CD-ROM
SPDIF Out :
Front Panel :
SATA1 :On Board IDE
SATA2 :On Board IDE

General Information :
NorthBridge :VIA P4M800CE
SouthBridge :VT8237 PCI to ISA Bridge

NorthBridge Information :
Architecture :Northbridge
Manufacturer :VIA (ASUSTeK Computer)
Revision :00
Bus Speed :133 MHz
FSB Frequency :532 MHz (QDR)
V-Link Bus Width :8-bit
V-LinkRate Speed :8x
V-Link Host Clock :66.97 MHz
V-Link Speed :535.76 MHz
V-Link Bandwidth :4286.08 MB/s
AutoDisconnect :Yes
DownStream Priority High :Yes
UpStream Priority High :Yes

Memory Information :
Type :DDR-SDRAM PC-4300
Frequency :266 MHz
DRAM/FSB Ratio :2/1
Supported Channels :1
ECC Diagnostic :Não
Interleave :4-way
CAS Latency (tCL) :2.5 clocks
RAS to CAS (tRCD) :4 clocks
RAS Precharge (tRP) :4 clocks
Cycle Time (tRAS) :12 clocks
Command Rate :2 T
Shared Memory (video) :Yes

Video Information :
Integrated Controller :Yes

APIC Information :
Version :0.03
Maximum Interrupts :24
IRQ Handler enabled :Yes

Device Capabilities (PCI) :
Latency Timer :8 clocks
I/O Access :No
Memory Access :Yes
Bus Master Capable :Yes
Special Cycle Recognition :No
Memory Write & Invalidate :No
VGA Palette Snoop :No
Parity Error Response :No
Cycle Wait :No
System Error Line :No
Fast Back-to-Back :No
Detects Parity Errors :No
User Defined Format :No
PCI 66Mhz Bus Support :Yes
New Capability List :Yes
PCI Support :AGP
PCI Support :Power Management Interface