if i have an opteron system with a single opteron (a 242), which has a dual channel memory controller, can i put in the pc2100 memory in one channel and pc3200 memory in another and have the two channels work at different speeds? there's probably a multiplier for this, locked/unlocked somewhere on the processor? my motherboard has 4 slots, and i believe each channel has two slots... anyone with enough knowledge about dual channel memory controllers? if it is possible, i might be intersted in the memory.
Well, I'm under the impression that dual channel memory controllers are designed to work with two identical sticks of special dual channel RAM. I'm sure it would work just fine with two different sticks of regular RAM, but I don't think it would take advantage of the dual channel functionality any longer. And I'm pretty sure both sticks would run at PC2100 speeds in the process.
The way I understand it, there's no such thing as special dual channel RAM. The only difference is in the way the motherboard and the memory controller access the RAM. They're taking advantage of an optimization that can only be used with two identical sticks.
However, many memory resellers are packaging memory in bundles of two to lower costs and entice the buyer. To my knowledge, there is no difference between specially packaged "dual channel" memory and simply two of the same kind of stick.
My guess is that when you use two sticks of the same size, but different speeds, the system will downclock itself to the lower speed. But it will still use the dual channel optimization.
If I'm wrong, let me know. I'm a little hazy on this area.
Joined: Sun 08-24-2003 3:47PM Posts: 1049 Location: Behind YOU!
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Some memory sticks are tested so the modules' timings are the same. Others just sell in two packs. It only really makes a difference if you want to know what good timings are without messing with the ram when you get it and not OC too much.
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Joined: Wed 09-10-2003 5:23PM Posts: 1209 Location: 1604 Pine St.
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Dual channel will work with any RAM, provided it is the same size, same speed, and has the same timings. One stick can be corsair and one stick could be kingston, and they would work in dual channel as long as those 3 things hold true. However, since you're running PC2100 and PC3200, it won't run dual channel since they have different speeds. They'll both run single-channel PC2100.
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