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Old 12-15-11, 10:57 PM   #1
sillyeagle
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Default What's up with Intel going back to dual channel memory?

I've read at least 5 Sandy Bridge reviews, and none of them touch on why triple channel memory is no longer offered/needed. One review did talk about improvements with pre-fetch, which makes it sound like Sandy Bridge just doesn't need as much bandwidth as Nehalem. Is that right?

I think Nehalem using triple channel has 25% more memory bandwidth than SB, but seems hard to believe pre-fetch improvements alone could lead to SB using 25% less bandwidth.
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Old 12-15-11, 11:13 PM   #2
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Default Re: What's up with Intel going back to dual channel memory?

Sandy bridge has way more memory bandwidth than nehalem.

http://www.guru3d.com/article/core-i...600k-review/18
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Old 12-15-11, 11:40 PM   #3
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Default Re: What's up with Intel going back to dual channel memory?

Who really cares if it has less of something if it still performs better.
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Old 12-16-11, 12:08 AM   #4
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Default Re: What's up with Intel going back to dual channel memory?

Quote:
Originally Posted by Roadhog View Post
Sandy bridge has way more memory bandwidth than nehalem.

http://www.guru3d.com/article/core-i...600k-review/18
Hmm, well the 25% figured I saw was this:

Quote:
Originally Posted by Bit Tech
Triple-channel Nehalem CPUs still provides around 25 per cent more throughput than Sandy Bridge, and the new CPU needs to scale all the way to 2,133MHz in order to exceed Nehalem's 1,600MHz figure.

http://www.bit-tech.net/hardware/mem...andy-bridge/12
Given the figures you posted I'm not sure what bit tech is talking about here. Also I have yet to figure out how SB is running more bandwidth than Nehalem in the guru3d test considering they're only using 1600MHz memory with the SB rig, which I assume is what their Nehalem rig is also using.

Quote:
Originally Posted by Viral View Post
Who really cares if it has less of something if it still performs better.
You have a problem with somebody trying to understanding the reasons why it does or does not perform better? You might enjoy just not worrying about it and remaining ignorant of such things, but I generally like to understand those things when looking at a new system.
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Old 12-16-11, 12:49 AM   #5
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Default Re: What's up with Intel going back to dual channel memory?

Yeah, not sure what to tell you. I don't follow SB that much.
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Old 12-16-11, 01:02 AM   #6
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Default Re: What's up with Intel going back to dual channel memory?

I love my dual channel mobo.
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Old 12-16-11, 01:54 AM   #7
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Default Re: What's up with Intel going back to dual channel memory?

I think the better question is, why bother with triple channel memory?

http://www.tomshardware.com/reviews/...m,2057-13.html
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Old 12-16-11, 02:52 AM   #8
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Default Re: What's up with Intel going back to dual channel memory?

The short answer is, most of the time, CPUs don't need huge bandwidth to RAM. Triple channel was mostly a waste when it came out, maybe on SB-E it might matter a little, but even then its single digit precentage I'm guessing.
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Old 12-16-11, 03:24 AM   #9
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Default Re: What's up with Intel going back to dual channel memory?

Why did they get rid of it? Because it was a useless feature that barely gave any performance increase in synthetic benchmarks and zero increase in actual use.
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Old 12-16-11, 03:54 AM   #10
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Default Re: What's up with Intel going back to dual channel memory?

Yes, thank you. I guess the guru3d results are better simply because the CPU is faster... no memory bottleneck either way. Makes sense.
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Old 12-16-11, 04:47 AM   #11
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Default Re: What's up with Intel going back to dual channel memory?

In a multi-chip server/supercomputer board it might have more impact, so thats probably the major reason for the original inclusion.
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Old 12-16-11, 09:16 AM   #12
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Default Re: What's up with Intel going back to dual channel memory?

Odd that no one has mentioned:

Intel has gone to quad channel with Socket 2011, and the Sandy Bridge E processors.

http://en.wikipedia.org/wiki/LGA_2011
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