DDR3-1333 (PC3-10666) 9-9-9-24
DDR3-1600 (PC3-12800) 7-7-7-20
• The first part is self-explanatory (DDR3 memory).
• The number after it is the data transfer rate. Simply divide it by 4 to get the maximum FSB speed for which the module is rated. Example: 1600/4 = 400 MHz. Therefore, DDR3-1600 can work on systems with a FSB of up to 400 MHz (anything more and you’re lucky).
• The PC3-XXXXX is designation denoting theoretical bandwidth in MB/s. Some memory manufactures use this instead of the DDR3-xxxx designation. You can calculate it for any FSB you want by simply taking the FSB and multiplying by 32 (rounded in some cases). Example using a 400 MHz FSB: 400x32=12800. So you’d need at least PC3-12800 to run on FSB of 400 MHz.
I currently have Kingston 2 GB 1333Mhz RAM. Accordin to the above guide if i divide 1333/4=333. Does it mean the max FSB to which i can overclock my CPU is 333. So if if use a multiplier of 9x and FSB 333 i will get only 3.0Ghz.
Cant i overclock beyond 3Ghz?
My PSU is a 450W one. Can it prevent me from overclocking?
You have several choices. You can push the FSB up and see how fast your memory will run. You can relax the memory timings. You can increase the RAM voltage (don't go over 1.65 volts). Or you can run the RAM slower than the FSB.
Your PSU? Maybe. A lot depends on the quality of it. Overclocking can increase the power consumption of your CPU from 10 - 25 %. Overclocking my Q6600 to 3.6 GHz increased its power consumption from 8 amps to 9.5 amps.
RAM is not a Bottleneck to "compute power" as a stand alone, but mixed with "data transfer" it can. A rule of thumb is: "lower timings is always better than higher bandwith" on similar DDR modules.
Your second question is: for a fixed multiplier CPU, yes. If you're also attached to the FSB model of OC'ing, it's also a yes (C2D's and older, AthlonXP's and older if I recall correctly).
And for the last question you ask: yes it can, when you OC any component in a PC it will usually require move volts meaning in more watts consumed on a rail/channel from the MoBo. A rule of thumb is: "more Mhz means more Watts to consume" in a way or another in the same archs.