RAM Speed and CPU FSB

COJOi

Junior Member
Feb 18, 2004
1
0
0
I have been building my own systems for quite some time now but lately I have been confused about the RAM synching with the FSB. For example, which type of RAM, PC2700, PC3200, PC2100, would be more suitable for a Celeron with a FSB of 400MHz. I know PC3200 is the best configuration for a non overclocked P4C because the RAM runs at 400MHz and the FSB is at 800MHz. Actually, I have no idea why that is lol.

I will tell you what I have in my systems and you tell me if what I have installed is correct or not.

Asus A7V333
AMD Athlon XP 2000+
512MB PC2100 DDR RAM

Asus A7V333
AMD Athlon XP 2100+
512MB PC2100 DDR RAM

Asus P4P800 Deluxe
Intel Pentium 4 2.8C
1GB Corsair XMS 3200 Pro DDR RAM

Dell Dimension 4600
Intel Pentium 4 2.8 533FSB
256MB PC2700 DDR RAM

Dell Dimension 400SC
Intel Pentium 4 2.4C
128MB PC3200 DDR RAM

Shuttle XPC
Intel Celeron 2.0 400FSB
I cannot remember which RAM I installed as of right now.

I would just like it if someone could please explain to me how RAM speed works in conjunction with the FSB. I would like to add more RAM to the Dell systems but I just don't know which speed to invest in. Thank you.
 

Crusty

Lifer
Sep 30, 2001
12,684
2
81
pc1600 = 100mhz fsb
pc2100 = 133mhz fsb
pc2700 = 166mhz fsb
pc3200 = 200mhz fsb

All of those are DDR so multiply them by 2 to get your RAM speed.
Is that celeron a 100mhz fsb x4? If so, then pc1600 ram should be fine, if it is 200mhz fsb x2 then you would need pc3200