Many Thanks ACTechy. What I'm trying to do is updating my computer which is a little bit old, but I think that with a few changes it will be fast enough. This is what I think:
1)Replacing the RAM. I first thougth about adding a second RAM unit (it only has two sockets) of 2GB 533Mhz because the one it has is 1GB 533. I would like to ask you something here: I've opened the case and physically I've seen it says "DDR II 533FSB" but when I run some program for specifications such as siw or CPU-Z they say that the RAM is 266Mhz, how can this be possible? It also says that for my CPU the bus speed is 166.25Mhz and Rated FSB is 655Mhz. So I don't know which speed would fit best.
I also know that my chipset is Intel 945PM and I think they say it can work with 677Mhz, so I don't know if it would be better to remove the one I have and placing two modules of 2Gb at 677. I don't know much about this subject, if you could help me it would be amazing
2) My hdd is a thoshiba Mk1234GSX, I think is quite good, but I also think it creates sometimes the computer gets slow. Knowing my motherboard I think it works with SATA 1 (my computer is 7 years old) so I think I wouldn't appreciate a SSD as much as with a SATA 3, but since I can't change it, anyway I would see an advantage I think. But I've also seen that SSD are still failing too much, what do you think? I've read about people with SSD broken at the 2nd week.
So I would like to know if maybe HDD have evolved in a way that they are fast enough for me now considering the SATA1 thing.
In case I buy a SSD, which ones are the most reliables? I saw some benchmarks and they say that OCZ Vertex 128GB is one of the best, I've also read something about the SAMSUNG, but both are quite expensive, what do you think?
So finally I would install my old hdd drive in the caddy you showed me.
Thank you very much for all your answers and I'm sorry for this huge message
PS: Sorry for my English, I know I must have made many mistakes
I'm from Spain