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PC133 on a PC100 system?

Z

Zucarita9000

Golden Member
I'd like to upgrade of my systems. It's an old PC, running a 750MHz PIII with 128MB of PC-100 SDRAM. I've been looking some retailers here and I could only find PC-133 Memory. I was wondering if PC-100 and PC-133 RAM can coexist in a system without making it unstable.
The CPU is running at 100MHz FSB also.

The sys specs are:

Soyo 7VBA133
Pentium III 750MHz (Coppermine)
128MB (2x64MB) Kingston PC-100 SDRAM DIMMs.
Windows 2000 SP4
 
older PC133 will work, but newer PC133 (the cheaper stuff you'll want to buy 😉 ) is "high density" and won't be recognized properly. You can get real PC100 from crucial.com (look at top of this page) or the ForSale/Trade forum here.

(ed) ...at least for intel chipsets, not sure if the VIA 693A has the same problem.
 

Yep, it will work fine. The PC-133 and the PC-100 memory will both just run at PC-100 speeds. No problems. If you could get it to ONLY PC-133 in the system you could probably run your memory at PC-100 speeds but set the CAS latency lower since you'd be running your memory at a lower speed with some performance headroom.
 
I will probably buy some Kingston sticks. What about using 133MHz for the RAM and 100MHz for the CPU? Will that work? Or is it better to use the same FSB speed for the RAM and CPU?
 
As long as you avoid the 4-bit array DRAM parts you should be fine. That is, buy 8-bit modules with 16x8 128Mbit or 32x8 256Mbit DRAM parts.
 
don't worry, PC133 will run fine. and get double sided. some intel chipsets have problems with high-density memory
 
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