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
****** 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)

External Connectors :
****** 16450 Compatible : DB-9 male
****** 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