After doing some research, I found that you had an Intel motherboard and used a website called www.crucial.com
(Crucial is a brand of memory and have some useful tools on their website) These are the specs that came up. You can view the same information at this web address http://www.crucial.com/store/listparts.aspx?model=WS440BX
It also shows the price of the upgrade! Hope you find what you are looking for!
Q: Will my system recognize the maximum upgrade?
- 168-pin DIMM Banking: 3 (3 banks of 1)
- Chipset: Intel 440BX
- Error Detection Support: ECC and non-ECC
- Graphics Support: AGP 2X
- Max Component Density: 128Mb
- Max Unbuffered SDR SDRAM: 384MB
- Module Types Supported: Unbuffered only
- SDR SDRAM Frequencies: PC66 and PC100
- Supported DRAM Types: SDR SDRAM only
- USB Support: 1.x Compliant
How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found at http://www.crucial.com/kb/answer.aspx?qid=4251
Q: What memory goes into my computer, and will a faster speed be backward-compatible?
A: SDRAM memory with support for SDRAM, PC133 speeds.
Because SDR memory is backward-compatible, you can safely upgrade your system with any of the guaranteed-compatible SDR speeds listed below.
Q: How much memory can my computer handle?
Adding the maximum amount of memory will improve performance and help extend the useful life of your system as you run increasingly demanding software applications in the future.
Q: Do I have to install matching pairs?
No, you can install modules one at a time, and you can mix different densities of modules in your computer. But if your computer supports dual-channel memory configurations, you should install in identical pairs (preferably in kits) for optimal performance.
Q: Does my computer support dual-channel memory?
Your system does not support dual channel.
Q: Does my computer support ECC memory?
Your system does not support ECC. Because ECC and non-ECC modules should not be mixed within a system, install the same type of modules that are already in your system.