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AndyMac
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PostPosted: Wed Oct 26, 2005 9:26 pm    Post subject: Memory Reply with quote

My mini has 400mhz memory. I am confused, i though 333mhz was the max??? I ordered 1 gb of 333mhz (2700)!
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Susurrus
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PostPosted: Wed Oct 26, 2005 10:29 pm    Post subject: Reply with quote

PC2700 should be the max. Where'd you find out that yours uses DDR400?
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AndyMac
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PostPosted: Wed Oct 26, 2005 10:40 pm    Post subject: Reply with quote

I opened it up and read the peice. It also says in System Profiler.
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SOCOMRAIDER
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PostPosted: Fri Dec 02, 2005 1:20 am    Post subject: Reply with quote

mine says PC3200 on system profiler
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xyzzy
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PostPosted: Fri Dec 02, 2005 8:24 am    Post subject: Reply with quote

PC3200=DDR400
PC2700=DDR333

The Mini needs a minimum of PC2700 (DDR333) memory but it can certainly use PC3200 (DDR400) because the PC3200 module is faster than the PC2700, but of the same type (184 pin DDR). DDR means "Double Data Rate". In other words the ram is running at twice the bus speed. The bus speed in a Mini is 166Mhz and therefore needs AT LEAST 333Mhz memory. A PC 3200 (DDR400) module can be used in anything up to a 200 Mhz bus speed (other backplane multipliers notwithstanding).

It's common for Minis to be shipped with PC3200 memory (I know mine was). It won't help performance because the bus of the system is still running at 166 Mhz (x2 for the memory equals 333Mhz). While PC3200 is typically more expensive, I'm sure they shipped some with PC3200 just based on availability since it's a much more common speed these days. So if your system profiler shows PC2700, don't worry about it because our Minis can't take advantage of PC3200 speeds anyway. It it improtant to note when you go buy memory though because you can save a few bucks by getting the PC2700 (usually), but you can use PC3200 if that's all you can find at a particular shop.

Confusing enough? Cool
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bwanac
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PostPosted: Fri Dec 02, 2005 1:02 pm    Post subject: Reply with quote

Youre saying when I upgrade, I can buy 2700 and it will be just as fast on our computer as the 3200 because the bus speed limits it? So therefore, I can buy the 2700 cheaper and should do so? Correct?
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xyzzy
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PostPosted: Fri Dec 02, 2005 3:47 pm    Post subject: Reply with quote

bwanac wrote:
Youre saying when I upgrade, I can buy 2700 and it will be just as fast on our computer as the 3200 because the bus speed limits it? So therefore, I can buy the 2700 cheaper and should do so? Correct?


Exactly. The bus speed is always going to run at the same speed, you just need to make sure you have ram that is designed to handle that speed or greater. It's a bit like buying 8x DVD-R media for a 4x DVD burner. You can use them, but they will burn at the same speed as if you bought 4x media.

That said, there may be reasons that someone might want to buy PC3200 memory if they are upgrading. For instance, if you might be upgrading to a different machine later, you'll have a better chance of still meeting specs with PC3200 than with PC2700 so you can simply pop out a 1GB module and take it with you to the new system. The current G5 iMac and possibly (likely) a future version of the Mini would have a faster bus speed and need a PC3200 module. If I were shopping for ram and saw a PC3200 module for $10 more than a PC2700, I would go with the PC3200 for sure.
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