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Can DDR2 systems run any speed DDR2 Memory?

post #1 of 17
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Got a buddy with a Dell Dimension 4700. Runs DDR2 (I think PC2 3200 or 4300). Can he put PC2 6400 in? It's just as cheap these days. I didn't know if the notches would align or if the standard Dell mobo would recognize it.
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post #2 of 17
yes he can put in any DDR2 ram as long as its not SLOWER than what his system needs

just make sure its the right default voltage (probably 1.8 for him)
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post #3 of 17
I do believe, it will recognize it as the DDR2-6400, however, it will only run as high as the bus will allow. Meaning, my old K8N ran my DDR-4000 (DDR500) stuff at 400mhz, I had to OC it to get to 500mhz, your friend however does not have this luxury.
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post #4 of 17
Don't think they make PC2 3200, that'd be DDR2 400. If it's PC 3200, then that's DDR memory, and no you can't put DDR2 into a DDR machine.

Since it's Dell, it's most likely PC2 4200, which is DDR2 533. Dell loves to put s*** RAM in their machines. Chances are, the motherboard is also s***, and only supports DDR2 533/667. If my hunch is correct, then any DDR2 800 memory put into that machine would be downclocked to DDR2 667. And since it's a name-brand computer, you cannot overclock through the BIOS so you're stuck at those speeds. It will definitely fit and work though, and since DDR2 800 is so cheap, I'd get it anyway if you're adding more memory to the system as it's usually higher quality. I wouldn't replace a 2x1GB set of DDR2 533 with a 2x1GB set of DDR2 800 in a Dell though, just not worth it since it will probably run at DDR2 667 anyway which isn't much improvement. Don't worry, it will die soon enough and you can replace it then lol. My Dell memory lasted 3 years.
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post #5 of 17
It will run at the highest the motherboard can tolerate and won't go any faster unless somehow you were able to overclock the dell, which is highly highly unlikely.
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post #6 of 17
yep. i upgraded 2 of my friends old dells to 6400 just fine and even mixed it with their slower ram. both are running 3 GB (2x512+2x1GB)
it just downclocks to the lower speed. but more slower RAM>less higher speed ram, as long as the ram speed is the same as FSB speed. EX: A Q6600 with a 1066FSB needs 533mhz ram to not bottleneck, but that shouldnt be a problem
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post #7 of 17
Quote:
Originally Posted by sgdude View Post
EX: A Q6600 with a 1066FSB needs 533mhz ram to not bottleneck, but that shouldnt be a problem
No no no.....a Q6600 with a 1066FSB needs 1066MHz ram to not bottleneck =D That CPU is too powerful to be installing ram that slow, what a shame.
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post #8 of 17
In that case I'll tag onto that question. I have an XFX 680i LT SLI MB, and it is spec'd to to 6400. I want faster than 800, but I just assumed I couldn't. Are you telling me I can put in 1066 or whatever as long as I'm running DDR2 and I have to OC it to get it there? If so, I might start shopping for memory!
post #9 of 17
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Thanks to all!
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Seriously, 2x1 Ballistix are $25, I think that will fill the ticket nicely.
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post #10 of 17
Quote:
Originally Posted by hiiyah777 View Post
In that case I'll tag onto that question. I have an XFX 680i LT SLI MB, and it is spec'd to to 6400. I want faster than 800, but I just assumed I couldn't. Are you telling me I can put in 1066 or whatever as long as I'm running DDR2 and I have to OC it to get it there? If so, I might start shopping for memory!
Yeah you can just get faster ram and OC your FSB until you reach that speed. With good performance ram you can probably still go higher too.
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