The faster RAM will just default to the slowest RAM's speed. Having said that, ideally one should have matching sticks.

I have also come across 2 old Dell's and 3 old HP's with a mix of 100 and 133. The 2 Dell's had damage to a slot and would only support 1 stick and the 3 HP's all came up with constant memory errors, even with a single slot used or both with 100 or 133. So I think it depends on the make and model as to whether a pc can support more than one speed without problem.

As I stated before tho, Asus are well known for having problems with mixes of ram. It is best to stick with the makes of ram they recommend. I, for example, have filled all my slots on my Asus board with Infineon as they are on the supported list for my mobo and they work perfectly well.

Same with me. The machine i mentioned earlier is a dell XPS T600. 3 slots, and one of them is damaged.

jbennet


Those two may be a lot closer in speed than you realize.

The important part is that you got 7 years of usage. Well Done!

Well, thats just in that config, probably more overall - Got it in 1999 - had NT4.0 on it (which i wiped for win98 as i wanted games lol)

Cost a bomb for my parents back then, but its a good machine. Thinking about upgrading it actually, its got win2k as its only got 256mb ram, but it says it can take 256mb a slot up to a max of 768 (seeing as one is broken, 512) which means i could run XP quite well on it.

with just the gig in the computer restarts almost constantly with the 512 it runs just fine with both i keep getting a message that say instruction at (number) referenced memory at (number) memory cant be "read". and then it restarts am i overloading my computer with ram

Well that sounds like bad RAM

Did you run MemTest86 like I said?

no i didnt i dont know how to write just the image to a cd

It sounds more like a dodgey stick of RAM, I know AMD motherboards can have the funnies but it is unlikely. I have had an eMachines Intel Celeron M system and that had a 512MB RAM that I upgraded to 1.2GB RAM with mis matching frequencies and the newer higher frequency 1GB module clocked down as it should do.

So yes run memtest and confirm what they are clocking at so as to dismiss the dodgey underclocking.

Download a tool called DeepBurner (There is a free version - the free one is the one you want, not the pro or portable one). Install it, run it and choose "Burn ISO image". Point it at the image and click burn.