Computer Memory Help

Question:
Help!! Am thinking of purchasing a new memory stick for my home computer to give it a bit more omph, but am confused as to what I can stick inside the box! I have used PC Wizard 2006 to do a system scan and it came back with these results:
General Information :
A0 (RAS 0) : 256 (Single Bank)
A1 (RAS 2) : 256 (Single Bank)
A2 : Empty
Information SPD EEPROM (A0) :
Manufacturer : Nanya Technology
Part Number : NT256D64S88B0G-75B
Serial Number : 1813090B
Type : DDR-SDRAM PC2100 (133 MHz) - [DDR-266]
Size : 256 MB (1 rows, 4 banks)
Module Buffered : No
Module Registered : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Manufacture : Week 29 of 2004
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz
Information SPD EEPROM (A1) :
Manufacturer : Nanya Technology
Part Number : NT256D64S88B0G-75B
Serial Number : 1813090B
Type : DDR-SDRAM PC2100 (133 MHz) - [DDR-266]
Size : 256 MB (1 rows, 4 banks)
Module Buffered : No
Module Registered : No
Width : 64-bit
Error Correction Capability : No
Max. Burst Length : 8
Refresh : Reduced (.5x)7.8 µs, Self Refresh
Voltage : SSTL 2.5v
Manufacture : Week 29 of 2004
Supported Frequencies : 100 MHz, 133 MHz
CAS Latency (tCL) : 2 clocks @100 MHz, 2.5 clocks @133 MHz
RAS to CAS (tRCD) : 2 clocks @100 MHz, 3 clocks @133 MHz
RAS Precharge (tRP) : 2 clocks @100 MHz, 3 clocks @133 MHz
Cycle Time (tRAS) : 5 clocks @100 MHz, 6 clocks @133 MHz
Memory Controller Information :
Memory Controller : Standard, EDO
Number of connectors : 3
Max. Module Size : 32 MB
Max. Memory Size : 96 MB
Supported Speed : 70ns, 60ns
Supported Voltages : 5v
Error Detection Method : No
Error Correction Capability : Unspecified
Current/Supported Interleave : 4-way/1-way
So far so good, but when I went to Crucial Memory it gave me conflicting information, including saying that I don't have an empty mempry slot even though I am 99.9% sure I do
I would be looking to add at least another 256Mb, but might be tempted to stretch to 512Mb (therfore giving me 1Gb) if the price was right!
Can some techno Guru point me in the right direction, cheers

Answers:
Have a look inside your PC or look at the motherboard manual, the scan shows that you have 3 memory slots with two occupied by 256mb chips, its the easiest way to check the number of slotsas the PC scan may be wrong.
Or, google the motherboard and see what details you can find on it.
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