Thread: Mixing Memory Modules

So, ever since I've become a hardcore programmer, I haven't really kept up with the computer hardware side of things. I remember back when I was building machines that it was recommended to not mix memory modules. I'm just wondering if anyone knows if this is still the case with today's technology.

Originally Posted by don94403

I'm no expert in hardware, either, but I know that mixing memory chips rated at different speeds can get you in a world of hurt. If they're the same rated speed, I should think you'd be OK.

Yes, that's also my understanding. For example mixing DDR2-5300 with DDR2-6400 I think is still a no no...

I always use www.crucial.com to scan the system and give me upgrade options.

I did some further reading as my question didn't apply to just the speed of the chips (that was pretty much a given as it will only be as fast as the slowest). Anywho, it seems that even mixing brands should be okay as there is only a select few chip manufacturers. Man, I really need to get back into the game

Yeah, I haven't got a clue when it comes to hardware...

Ok, here's the deal on that..... You can mix, but your system will run with the lower clock speeds. If you install the RAM, and your computer beeps at you, you will need to pull it back out, and set the memory settings in BIOS manually to match the slowest RAM you have.

When you buy RAM, it is important to get good quality RAM, as the cheaper stuff can be flakey when you step it down. Hope that helps.

On a side note, technically speaking, say your board only does 667Mhz DDR2, theoretically speaking you should be able to put 800Mhz DDR2 in it, and it's supposed to step down. Now, don't take my word for this, as I always match my RAM to the mobo, and also check out the mobo RAM compatibility specs where possible, so I've never tested the theory. You'll find that a lot of mobos have problems when you're pushing the upper limits of it's memory capacity. Something to remember when you're trying to max out system RAM. Generally speaking, when maxing out RAM, go with the premium memory.