Choosing a RAM

I have an Acer 5052 NWXmi laptop. Currently I have 1 GB DDR2-533/PC2-4200 CL 4 and 512 mb DDR2-533/PC2-4200-444-12-A2 2rx16 200 PIN (CL 4 as well I guess).

My laptop came with 512 mb mentioned above and later I added a 1 GB RAM now its 1.5 GB RAM

I saw I can upgrade up to 4 GB and now I want to buy two 2 GB DDR2-667/PC2-5300 while looking through Internet I found one 2 GB with 3-4-5 CAS Latency

Can I go for it cause mine is 4-4-4 CAS L? and what is the Max speed I can go for, like 667 or 800 MHz or I should only use 533 MHz? below I gave the details of my laptop RAM, Mother board and CPU.

Operating System________________________________________________________________________
Windows 7 Ultimate 32-bit SP1
CPU
AMD Turion 64 X2 Mobile TL-50 62 °C
Taylor 90nm Technology
RAM
2.00GB Single-Channel DDR2 @ 266MHz (4-4-4-12) does this mean 2GB in single slot?
Motherboard
Acer, Inc. Prespa M (Socket M2/S1G1) 60 °C
Graphics
Generic PnP Monitor (1280x800@59Hz)
ATI Radeon Xpress Series (Acer Incorporated [ALI])
Storage
465GB Seagate ST500LT012-1DG142 ATA Device (SATA) 44 °C
Optical Drives
HL-DT-ST DVDRAM GSA-T20N ATA Device
Audio
Realtek High Definition Audio


RAM__________________________________________________________________________________
Memory slots
Total memory slots 2
Used memory slots 2
Free memory slots 0
Memory
Type DDR2
Size 1536 MBytes
Channels # Single
DRAM Frequency 266.8 MHz
CAS# Latency (CL) 4 clocks
RAS# to CAS# Delay (tRCD) 4 clocks
RAS# Precharge (tRP) 4 clocks
Cycle Time (tRAS) 12 clocks
Bank Cycle Time (tRC) 17 clocks
Command Rate (CR) 1T
Physical Memory
Memory Usage 87 %
Total Physical 1.25 GB
Available Physical 154 MB
Total Virtual 3.12 GB
Available Virtual 701 MB
SPD
Number Of SPD Modules 2

Slot #1________________________________________________________________________________
Type DDR2
Size 1024 MBytes
Manufacturer Kingston
Max Bandwidth PC2-4300 (266 MHz)
Part Number 9905295-038.B00LF
Serial Number 9239DA2A
Week/year 23 / 12
JEDEC #3
Frequency 266.7 MHz
CAS# Latency 5.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
JEDEC #2
Frequency 266.7 MHz
CAS# Latency 4.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
JEDEC #1
Frequency 200.0 MHz
CAS# Latency 3.0
RAS# To CAS# 3
RAS# Precharge 3
tRAS 9
tRC 12
Voltage 1.800 V


Slot #2________________________________________________________________________________
Type DDR2
Size 512 MBytes
Manufacturer Nanya Technology
Max Bandwidth PC2-4300 (266 MHz)
Part Number NT512T64UH8A1FN-37
Serial Number 57703731
Week/year 52 / 06
JEDEC #3
Frequency 266.7 MHz
CAS# Latency 5.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
JEDEC #2
Frequency 266.7 MHz
CAS# Latency 4.0
RAS# To CAS# 4
RAS# Precharge 4
tRAS 12
tRC 16
Voltage 1.800 V
JEDEC #1
Frequency 200.0 MHz
CAS# Latency 3.0
RAS# To CAS# 3
RAS# Precharge 3
tRAS 9
tRC 12
Voltage 1.800 V

Motherboard____________________________________________________________________________
Manufacturer Acer, Inc.
Model Prespa M (Socket M2/S1G1)
Version Not Applicable
Chipset Vendor ATI
Chipset Model Xpress 200 (RS480)
Chipset Revision 10
Southbridge Vendor ATI
Southbridge Model SB400
Southbridge Revision 80
System Temperature 60 °C
BIOS
Brand Acer
Version v1.3302
Date
PCI Data
Slot PCI
Slot Type PCI
Slot Usage Unknown
Bus Width 32 bit
Slot Designation PCI1
Characteristics 5V, 3.3V, PME
Slot Number 0
Slot PCI
Slot Type PCI
Slot Usage Unknown
Bus Width 32 bit
Slot Designation PCI2
Characteristics 5V, 3.3V, PME
Slot Number 1
Slot PCI
Slot Type PCI
Slot Usage Unknown
Bus Width 32 bit
Slot Designation PCI3
Characteristics 5V, 3.3V, PME
Slot Number 2

CPU__________________________________________________________________________________
AMD Turion 64 X2 Mobile TL-50
Cores 2
Threads 2
Name AMD Turion 64 X2 Mobile TL-50
Code Name Taylor
Package Socket S1 (638)
Technology 90nm
Specification AMD Turion 64 X2 Mobile Technology TL-50
Family F
Extended Family F
Model 8
Extended Model 48
Stepping 2
Revision BH-F2
Instructions MMX (+), 3DNow! (+), SSE, SSE2, SSE3, AMD 64, NX, VMX
Virtualization Supported, Disabled
Hyperthreading Not supported
Bus Speed 200.1 MHz
Rated Bus Speed 800.5 MHz
Stock Core Speed 1600 MHz
Stock Bus Speed 200 MHz
Average Temperature 64 °C
Caches
L1 Data Cache Size 2 x 64 KBytes
L1 Instructions Cache Size 2 x 64 KBytes
L2 Unified Cache Size 2 x 256 KBytes