Download the zip, unzip it, run cpuz.exe, click on memory and tell us what the type says. DDR is much faster, the bus for those run at 266Mhz, 333Mhz or 400 Mhz, SDRAM runs at 100Mhz or 133Mhz, DDR2 RAM runs at 544Mhz or 667Mhz.
Also in CPUZ click on the SPD tab and see what the max bandwidth is. This will also tell us what kind of DDR RAM you are you using.
To figure out the size of your hard-drive, open up my computer, Right click on the C: drive and go to properties, it will show you how big your hard drive is and how much of it is being used. This info can be wrong if you have partitioned your hard drive into 2,3,4 et... drives.
About the memory, how old is this computer you are on? Did you check the SPD tab in CPU-Z
Well...PC2100 = 266mhz, PC2700 = 333mhz, and PC3200 = 400mhz etc...it would depend on what speed your motherboard supports, using CPU-Z find out what is currently installed, (it will also tell you what mobo you have) and purchase based on that info.
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