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Can I combine PC133 and PC100 memory?

A

aircasper

Senior member
This may be a stupid question, but can I simultaneously use PC133 and PC100 memory? The reason why I ask is because my motherboard utilizes up to PC100 memory, but I was able to get a cheap stick of 256MB PC133. I'm hoping to use the PC133 memory in one of the open memory slots on the motherboard in conjunction with the 2 sticks of 64MB PC100 that are already there. Also, is there a way to check the speed of the memory, because one of the 64MB sticks came with the computer and I'm not even sure if its PC100. Thanks for your help.
 
thanks conlan. i was worried there for a second that i was going to have a useless stick of PC133 memory. i take it the pc133 memory simply operates at the same speed as pc100 memory when the mobo doesn't take advantage of pc133 speeds?
 


<< thanks conlan. i was worried there for a second that i was going to have a useless stick of PC133 memory. i take it the pc133 memory simply operates at the same speed as pc100 memory when the mobo doesn't take advantage of pc133 speeds? >>



I doubt that your Pc100 will run at 133Mhz. Therefore the PC133 stick will have to run at 100mhz and there will be no harm done. 🙂
 
u can make it take advantage of the pc133 by setting the system bus higher than 100. but depend on your other stick of pc100, it might not go beyond 110, most quality pc100s will do at least 115, also you will be overclocking your processor too by raising the system bus.
 
that makes sense pillage. do you know if there's some way to figure out what speed a memory stick runs at? like i said in my original post, i don't really know what type of memory came with the computer. i'm just guessing its pc100, but what if it's something like pc66? is it possible that my pc100 stick is running at pc66 due to the stick that came with the computer? sorry if this is a dumb question.
 
I have 10 PC100 sticks (128MB ea.).

2 Run 110MHz

4 Run 133MHz

2 Run 138MHz

2 Run 140MHz.

As long as you have a good backup of the registry, you can try any Frequency.
 


<< I doubt that your Pc100 will run at 133Mhz. Therefore the PC133 stick will have to run at 100mhz and there will be no harm done. >>

Your right, I'm running FSB @ 100 🙂. If he had posted he was running PC133 and was going to add PC100, then i would've asked what FSB he was running. 😀

EDIT.. I have seen PC100 running @ 133, although a lot of PC100 won't make it that high.
 
hmm, overclocking eh? i never really considered overclocking the system, but i'd love to try. is there a good site that provides good info for a beginner? i'm not too worried about frying the chip, as i plan on upgrading the piddly 466 celeron to a 900 MHz celeron anyways. might as well give it a shot before i replace the cpu.
 
What Motherboard are you using?? You over-clock by raising the FSB speed either through a "soft-bios" adjustment, or by jumpers/switches on your motherboard. Read more about it @ Overclcokers.com (Fixxed link below) Under tips and techniques: Overclcoking Basic Training. The Celeron runs @ 66 FSB stock, so I wouldn't worry about the memory as i doubt your 466 will make it to 100 FSB.

EDIT... Fixxed Link
 
if the celerons run at 66 fsb, does that mean that anything over pc66 doesn't really do me any good unless i raise the fsb above 66? if that's the case, i bet that my current memory is 64mb pc66, 64 mb pc100, and soon to be 256mb pc133, but they'll all run at 66? that seems like a waste. oh well.

btw, my motherboard is an asus cuwe-rm (intel 810E chipset). thanks for all the great help everyone.
 
ooh, great RAM FAQ andyhui. i love learning about this stuff, it's just that i have so much to learn!
rolleye.gif


conlan, i can't seem to get the link to work. oops, nevermind. got it to work. (one too many http's in there)
 


<< conlan, i can't seem to get the link to work. oops, nevermind. got it to work. (one too many http's in there >>

Yup, sorry about that, I tried like 10 times, but it wouldn't let me fix it, anyway, glad ya figured it out, Happy reading 🙂
 


<< that makes sense pillage. do you know if there's some way to figure out what speed a memory stick runs at? like i said in my original post, i don't really know what type of memory came with the computer. i'm just guessing its pc100, but what if it's something like pc66? is it possible that my pc100 stick is running at pc66 due to the stick that came with the computer? sorry if this is a dumb question. >>



It has to depend on the markings that you see on your RAM. Some well known manufacturers will print their timing of the chips thewy used on it. For example. You can see MTxxxxxxxx - 75 which may mean that you're having a RAM with 7.5ns. Then you use the physics formula F = 1/t to convert the value to the actual frequency it's running at. For this case. 1/(7.5x10^-9) = 133 Mhz. 🙂
 
Then you use the physics formula F = 1/t to convert the value to the actual frequency it's running at. For this case. 1/(7.5x10^-9) = 133 Mhz.

geez, you guys are too smart for me. 🙂
 
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