View Full Version : Mixing PC100 and PC133 SDRAM

06-08-2001, 06:16 PM
Currently have a BX Pro 100MHz motherboard with 2 x 32MB PC100 SDRAM. Just bought 128MB PC133 SDRAM to upgrade memory. Can I mix the two types of SDRAM (to get 192MB), or do I have to remove the older PC100 SDRAM?

06-08-2001, 06:27 PM
Mixing the 133 and the 100MHz will be no problem as the faster ram will run underclocked (I am currently running a mix) so if you do have problems this wont be it.
I have been told that using the third slot on cheaper mobos can cause instabilities.

07-08-2001, 12:01 AM
Hi Murray,
You should be sweet just banging it in, the 133MHz will just run at 100MHz with the other two 32 Meg sticks.


08-08-2001, 01:48 AM
Hi. I have exactly the same mix of RAM running sweet on my TX Pro Mobo, but I did have problems at first. The original 32Mb sticks were in the number 1 and 2 slots, and I put the 128 PC133 stick in the 3rd slot. It ran, but auto-rebooted all the time. Pain in the butt.
However, the other day, I took them all out, and fitted the 128 in the number 1 slot, and the others in the 2 and 3 slot. All is sweet now; so try it if you have trouble.
Bye.. Richard.