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Can you mix PC100 and PC133 RAM modules?

Old 01-11-01, 02:11 PM
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Need some new memory, and my mobo can handle either PC100 or PC133 modules. Got a PC100 one in there at the moment, but what I want to know is: Can I stick a PC133 module in the next slot and expect them to work happily together, or is that going to f*** things up? If the latter, can I overcome this by setting the DRAM bus speed to 100 in the BIOS? And if I do that, will it significantly reduce the performance of my shiny new memory chips? So should I just chuck the PC100 and get a whole new bunch of memory?

(Yeah, I know, lots of questions, but hey...)
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Old 01-11-01, 02:35 PM
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I have done that before and it worked for me, but you do need to set your bios to 100.
 
Old 01-11-01, 02:35 PM
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Yes you can mix pc100 and pc133 as long as your FSB is set to the slowest speed (pc100)

If you have any problems it will be due to quality of ram not 100 vs 133
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Old 01-11-01, 02:44 PM
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Okay, that's good. But: My budget allows me to splash out on 128MB of PC133 RAM at the moment. I've currently only got 32MB, so should I stick the whole lot in and leave it running at 100, or will it be noticeably whizzier if I just stick the PC133 stuff in and let it run at its full speed?
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Old 01-11-01, 02:50 PM
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It actually depends on the RAM, I get mine from www.crucial.com, which in my opinion is the best, so I wouldn't put the other 32 in it may slow down the potential of the 133. ALso here is an interesting article about RAM. http://www.tweakersasylum.com/Review...rucial133.html
 
Old 01-11-01, 03:38 PM
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quote:
Originally posted by TheyCallHimJim:
Okay, that's good. But: My budget allows me to splash out on 128MB of PC133 RAM at the moment. I've currently only got 32MB, so should I stick the whole lot in and leave it running at 100, or will it be noticeably whizzier if I just stick the PC133 stuff in and let it run at its full speed?




Do you overclock? or want to?

If not you must run at the FSB your processor requires (I will assume 100 in your case) about the only speed boost you can get without oc'ing is to drop from cas 3 to cas 2.

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Old 01-11-01, 03:46 PM
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yes, you can mix and match them.. memory can always run slower, but you dont want to try to run it faster.

so if your system is running at 66, you can use 66, 100, 133, 150..

if your system is running at 100, you can use 100, 133, 150..

and so on.. there is no need to push your system up to 100 to use 100 and 133 memory in it, but its generally not best to push it above 100 while your still using that 100 memory.

Im not saying it wont work to have slower memory then your system is set at, but it wont work well..
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