what is the FSB multiplier (Front Side Bus) of a p4 running at 533 FSB? is it 4? cuz 4* 133 = 533 if so, does this mean pc133 RAM is what you need for this cpu and that anything more pc133 (say 400 MHz DDR) is a waste of money..
FSB [email protected] Are you sure that you are not talking about [link=http://www.hardwareforums.com/ddr-speeds-pcxxxx-ddrxxx-cheat-sheet-12882/]this??[/link]
FSB [email protected] All Pentium 4's use a quad-pumped FSB. If you're using SDRAM, PC133 will do the trick. With DDR it's PC2100/DDR266. While anything faster isn't going to help, you may find that PC3200 is going to be cheaper than buying the slower stuff.
FSB [email protected] You want at least ddr400 if you want to avoid bottlenecking. The 133mhz FSB on a P4 means its bandwidth is 4.2gb/s. DDR400 will provide up to 3.2gb/s, though in reality its more like 2.6-2.8gb/s. I used to have a 100mhz FSB P4 with pc100, it was simply the chea[er option the time. RDRAM was, and still is too expensive. Like Big B said, ddr400 will probably be cheaper than pc133 anyway!
You only need DDR266 for a 533MHz FSB P4. The external clock is 133MHz, which multiplied by 4 give 533MHz. DDR266 runs at 133MHz. DDR400 can be used, but it's not going to give any more bandwidth unless you're running an asynchronous FSB:Mem ratio or overclocking. On the flip-side, you're probably going to pay more for PC2100 than PC3200, which makes little sense since PC3200 will run fine at slower speeds.
