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jphermans
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Joined: 09 Jun 2006
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PostPosted: Fri Jun 09, 2006 7:33 am    Post subject: Memory bank Reply with quote

Is it necessary to change both banks to upgrade the memory on a intel mac mini ? Or can i just change one bank ?
The reason for upgrading is that i can not some programs smoothly.

Laughing
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kaidomac
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PostPosted: Fri Jun 09, 2006 8:18 am    Post subject: Re: Memory bank Reply with quote

[quote="jphermans"]Is it necessary to change both banks to upgrade the memory on a intel mac mini ? Or can i just change one bank ?
The reason for upgrading is that i can not some programs smoothly.

Laughing[/quote]

It is not required, but it is a good idea, and I'll tell you why: the Mini likes to run off what's called [i]matched pairs of ram[/i], which is where both sticks of ram are the same size & speed. This is called [i]dual channel[/i] ram. It doesn't affect system performance too much, but it really affects your video performance. The Intel Mini's video card shares ram from the system ram, which means that if you don't have matched pairs of ram, you'll be taking a performance hit there.

Right now ram is so cheap it's not even funny. If you can afford it, I would highly recommend maxing your Mini's memory banks out so that you never have to worry about it again. The Intel Mini can take a maximum of 2 gigs of ram (2 x 1gb sticks). It will cost about $165 or so, which is an incredible price for what you're getting. Here are a few links:

http://www.newegg.com/product/product.asp?item=N82E16820208037

http://www.newegg.com/Product/Product.asp?Item=N82E16820221043

http://www.newegg.com/Product/Product.asp?Item=N82E16820231069
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Exam23
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PostPosted: Fri Jun 09, 2006 10:59 am    Post subject: Well Said Reply with quote

I went from the original 512 to 2 gig, wow... day and night....
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MiniMoe
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PostPosted: Fri Jun 09, 2006 11:10 am    Post subject: Reply with quote

According to Intel's datasheet, to get "matched" (symmetric dual-channel) performance with the Intel chipset, only the speed and memory size need to be the same. You don't need the same brand or technology. Read it for yourself here: [url=http://download.intel.com/design/mobile/datashts/30921902.pdf]Mobile Intel 945 Express Chipset Family Datasheet[/url]

Page 331

Dual-channel Symmetric Mode

[b]This mode provides maximum performance on real applications[/b]. Addresses are between the channels, and the switch happens after each cache line (64-byte boundary). The channel selection address bit is controlled by DCC[10:9]. If a second request sits behind the first, and that request is to an address on the second channel, that request can be sent before data from the first request has returned. Due to this feature, some progress is made even during page conflict scenarios. If two consecutive cache lines are requested, both may be retrieved simultaneously, since they are guaranteed to be on opposite channels. The drawback of Symmetric mode is that [b]the system designer must populate both channels of memory so that they have equal capacity, but [u]the technology and device width may vary from one channel to the other[/u][/b].


Dual-channel Asymmetric

[b]This mode trades performance for system design flexibility[/b]. Unlike the previous mode, addresses start in channel A and stay there until the end of the highest rank in channel A, then addresses continue from the bottom of channel B to the top. Real world applications are unlikely to make requests that alternate between addresses that sit on opposite channels with this memory organization, so [b]in most cases, bandwidth will be limited to that of a single channel[/b]. The system designer is free to populate or not to populate any rank on either channel, including either degenerate single-channel case.


Now, certainly, if you're using more than 1GB of memory but less than 1.25GB, a 1GB stick with a 256MB stick will be faster than swapping out to disk with two 512MB sticks. However, if you aren't using more than 1GB, the unmatched pair will cost you about 4% real-world performance with most applications on a machine with dedicated graphics, from all the tests I've seen. I agree that most users won't be able to tell the difference, but keep in mind that's about the same real world difference as that between 1.83GHz and 2.0GHz or 2.0GHz and 2.16GHz processors.


It's a different story with computers that use the integrated graphics (Mini, MacBook, and some PCs). Matched memory can result in up to 70% faster performance with some applications, in tests I've seen.

Page 353

The entire IGD [Integrated Graphics Controller] is fed with data from its memory controller. [b]The GMCH's graphics performance is directly related to the amount of bandwidth available. If the engines are not receiving data fast enough from the memory controller (e.g., single-channel DDR2 553), the rest of the IGD will also be affected.[/b]

Whether you can afford to sacrifice half the memory bandwidth by using mismatched memory, depends on whether your computer needs it or not, and for some applications on computers with integrated video, like the Mini and MacBook, the answer for me would be no.
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1.66GHz Core-Duo Mini, 2GB/120GB, Apple 23" Cinema HD Display
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jphermans
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PostPosted: Fri Jun 09, 2006 3:57 pm    Post subject: Re: Memory bank Reply with quote

[quote="kaidomac"][quote="jphermans"]Is it necessary to change both banks to upgrade the memory on a intel mac mini ? Or can i just change one bank ?
The reason for upgrading is that i can not some programs smoothly.

Laughing[/quote]

It is not required, but it is a good idea, and I'll tell you why: the Mini likes to run off what's called [i]matched pairs of ram[/i], which is where both sticks of ram are the same size & speed. This is called [i]dual channel[/i] ram. It doesn't affect system performance too much, but it really affects your video performance. The Intel Mini's video card shares ram from the system ram, which means that if you don't have matched pairs of ram, you'll be taking a performance hit there.

Right now ram is so cheap it's not even funny. If you can afford it, I would highly recommend maxing your Mini's memory banks out so that you never have to worry about it again. The Intel Mini can take a maximum of 2 gigs of ram (2 x 1gb sticks). It will cost about $165 or so, which is an incredible price for what you're getting. Here are a few links:

http://www.newegg.com/product/product.asp?item=N82E16820208037

http://www.newegg.com/Product/Product.asp?Item=N82E16820221043

http://www.newegg.com/Product/Product.asp?Item=N82E16820231069[/quote]

Since I'm living in Belgium i can not order it at Newegg.
I've to look somewhere else.
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valefortia
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PostPosted: Fri Sep 28, 2018 9:32 pm    Post subject: Reply with quote

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