What fsb does intel processors run at?

[awdark]

Okay im confusing myself. If the fsb is only at 100, whats the point of ram faster than pc100 sd?! Oh and if I were to oc this thing would I set fsb to 133 and decrease multi so I dont go as high? I know williamettes dont oc very well.

I have an ECS mobo (i know crap but i base on price) and the instructions were kinda vague so I want to know if I configured correctly.

A fan of Intel and ATI but went to AMD and Nvidia because of $$$. And now I have one more reason to like Intel, my p4 still works after I blew my compaq mobo and psu nice to know another thing in that box still works.

 

[PhoenixAshes]

Your CPU is running a "quad pumped" bus speed..... Therefore, you have the base 100MHzX4 giving you your 400MHz FSB.... I wouldn't try to jump straight to a 133 FSB as I doubt the processor would hold it very well. And I also believe that you're not running an unlocked processor... I could be wrong though. Just bump it up about 5 MHz at a time until it starts having stability issues and then bump your Vcore up a notch and keep going til it either puts out too much heat or it just won't stabilize.

 

[awdark]

Ok..
Well... its an ecs not known for overclocking, it gives two options either 100 or 133 for bus speed so I assume it would be hopeless to try to overclock that far.

So if it does that quad pump thing why do people need to get ram thats faster than 100?

 

[SuperSubZero]

Does that board use RDRAM? RDRAM is only available in 100 and 133 (400 and 533mhz) varieties.

I don't understand your question about "need" because with overclocking all the numbers go out the window anyways.

 

[Thatonen00b]

I thought RDRAM was 600, 800 and 1066?

 

[Thatonen00b]

I thought RDRAM was 600, 800 and 1066?
nm 533mhz = 1066 etc..

 

[Tweak Monkey]

133mhz would give you 2.394ghz. I don't think the williamette core has much of a chance to hit that, but it probably wouldn't hurt to try right it would be pretty un-[H]ard not to. For you to change the multiplier, you probably have roughly a 1 in 1 billion chance that you've got a leaked engineering sample...and even if you were that lucky, your motherboard wouldn't have any idea of how to adjust that, lol. You could probably spend a couple bucks on a newer motherboard and get 2ghz or so out of that chip if you were really interested in it.

 

[Stugots]

if you had a ES (unlocked) chip, it would say it in cpuid, it would also show you that the multipliers were unlocked. yours is locked like rest. www.cpudatabase shows alot of people being able to break 2.1ghz on that chip, check that out for help.

 

[awdark]

Um okay so its hopeless to overclock on this because all the board gives as an option is 100/133mhz and the bios has basically no option to change the stuff.

Im using ddr pc2100 in it and it brings me to the next question.. why do we need anything faster than SD ram if it only works at 100?

 

[Stugots]

Um okay so its hopeless to overclock on this because all the board gives as an option is 100/133mhz and the bios has basically no option to change the stuff.

Im using ddr pc2100 in it and it brings me to the next question.. why do we need anything faster than SD ram if it only works at 100?

i upgraded from a bx system that used sdram. heres the memory bandwidth comparison between sdram and ddrsdram.

sdram = ~670mb's
ddram = ~6300mb's

enough said

 

[rayman2k2]

look:
your FSB= 100 x 4(quad-pumped) = 400mhz

DDR200 = 200 x 2(DUAL data rate) = 400mhz

So, you need at least DDR200. To find that speed, multiply by 8 bits(dont know where this comes from), to get PC1600 or DDR200

Now, what you have is DDR266, or PC2100. 2100 / 8 bits = 266.6666...

DDR266 = 266.6666... x 2(DUAL data rate) = 533mhz FSB / 4 (quad-pumped) = 133.3333...mhz.

Basically DDR266 is good up until your fsb is 133mhz/533mhz.

 

[Stugots]

insta-table...


SD
-------
PC66 = 66 / 66
PC100 = 100 / 100
PC133 = 133 / 133

DDR
---------

PC1600 = 100 / 200
PC2100 = 133 / 266
PC2700 = 166 / 333
PC3000 = 188 / 375
PC3200 = 200 / 400
PC3500 = 216 / 433
PC3700 = 233 / 466
PC4000 = 250 / 500
PC4200 = 266 / 533
PC4400 = 275 / 550
PC4800 = 300 / 600

 

[awdark]

Um okay.. so PC2100 = 133 / 266
and the benefit will be greater bandwith, not the fsb because it ends up at 100x4 for 400 anyways

Once I reach the threshold of PC3200 = 200 / 400 then it will just do um dual-pump rather than quad-pump and I guess thats a good thing because its 200x2 for the same 400


----

Okay how about this.. if my cpu is a P4, 256k cache, 400fsb, and I have PC2100 DDR in it.. what speed should the ram be running at? 100x4 and 100x18 right?

 

[compslckr]

Your CPU is running a "quad pumped" bus speed..... Therefore, you have the base 100MHzX4 giving you your 400MHz FSB.... I wouldn't try to jump straight to a 133 FSB as I doubt the processor would hold it very well. And I also believe that you're not running an unlocked processor... I could be wrong though. Just bump it up about 5 MHz at a time until it starts having stability issues and then bump your Vcore up a notch and keep going til it either puts out too much heat or it just won't stabilize.

my pentium 4 cpu (2.0A) is ment to run at 400mhz bus (100mhz fsb) speed, and i just cranked it straight up to the 533 mhz bus speed (133mhz fsb) and it worked fine, but i may have just gotten a good chip or something, i dunno.

just try it, and if it does not work just reset the cmos and reboot it.

 

[rayman2k2]

Um okay.. so PC2100 = 133 / 266
and the benefit will be greater bandwith, not the fsb because it ends up at 100x4 for 400 anyways

Once I reach the threshold of PC3200 = 200 / 400 then it will just do um dual-pump rather than quad-pump and I guess thats a good thing because its 200x2 for the same 400


----

Okay how about this.. if my cpu is a P4, 256k cache, 400fsb, and I have PC2100 DDR in it.. what speed should the ram be running at? 100x4 and 100x18 right?

depending on the divider, I think your memory is running at PC1600 speeds, or DDR200. Why? 100mhz FSB x 2(DUAL data rate) = 200mhz or DDR200

Dividers change the speed of the ram when the CPU's FSB stays the same. Dividers come in fsb to memory speeds, also known as fsb:memory. If your divider is 1:1, then your FSB is your memory speed (then multiply by two for DUAL data rate). If your divider is 3:4, then your memory speed is 1/3 greater than your FSB, so, if you have a 3:4 divider, and your FSB is 100, that means that your memory is running at 133, or DD266 effectively. Dividers come in 1:1, 3:2, 3:4, and 5:4 ratios, at least those are the most common.

 

[wangFu]

i also have an ol williamette, only this is 1.6, i crancked the fsb to 119, now it runs at 1.9, havent tried any further, runnign at 1.8v on stock hsf, survived prime95 for 8 hrs(all niter) i closed it when i woke up, havent had any stability probs

 

[Big Worm]

look:
your FSB= 100 x 4(quad-pumped) = 400mhz

DDR200 = 200 x 2(DUAL data rate) = 400mhz

So, you need at least DDR200. To find that speed, multiply by 8 bits(dont know where this comes from), to get PC1600 or DDR200

Now, what you have is DDR266, or PC2100. 2100 / 8 bits = 266.6666...

DDR266 = 266.6666... x 2(DUAL data rate) = 533mhz FSB / 4 (quad-pumped) = 133.3333...mhz.

Basically DDR266 is good up until your fsb is 133mhz/533mhz.

Errmm...

DDR 200 is 100 x2.

DDR 266 is 133 x2.

Using ddr 266 on a p4 only gives you the bandwidth of the memory running at 266, leaving the 400mhz fsb p4 starving a bit for memory bandwidth.

DDR 400, 200 x2 would be ideal for a p4 with a 400mhz fsb, you could run everything 1:1.

This is why rambus was great for the early p4 cpu's and chipsets.