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How Much Faster is Quad Channel RAM Than Dual Channel?

Last response: in Memory
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April 21, 2014 5:47:42 PM

Is quad channel worth it over dual channel? If so is the performance gap as large as single channel and dual channel?
a b } Memory
April 21, 2014 5:56:31 PM

You can compare different RAMs at - http://www.memorybenchmark.net/

But at the moment there is a limit of 8GB per DIMM slot. Quad channel can offer 8 slots - 64GB. Dual Channel 4 slots, Single channel 2 slots.

So it is size not speed that is determined by no. ram channels. And size does matter!
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April 21, 2014 6:00:34 PM

i7Baby said:
You can compare different RAMs at - http://www.memorybenchmark.net/

But at the moment there is a limit of 8GB per DIMM slot. Quad channel can offer 8 slots - 64GB. Dual Channel 4 slots, Single channel 2 slots.

So it is size not speed that is determined by no. ram channels. And size does matter!


Yes, but is it faster than dual channel?
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a b } Memory
April 21, 2014 6:05:43 PM

The number of dimms and a compatible chipset determines ram channels. Size and speed is irrelevant to number of channels and 8gb is the max for non-ecc, ecc goes up to 64gb.

The performance difference depends on the application. If it's ram intensive then you'd actually see a difference. http://www.legitreviews.com/ddr3-memory-performance-ana...
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April 21, 2014 6:15:15 PM

I don't mean to be rude but all I want to know is if I would see a difference in general performance.
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a b } Memory
April 21, 2014 6:19:41 PM

You won't see a difference as ram bandwidth is not a bottleneck in general.
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April 21, 2014 6:35:11 PM

k1114 said:
You won't see a difference as ram bandwidth is not a bottleneck in general.


Ok thanks
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a c 1941 } Memory
April 21, 2014 6:37:07 PM

You will Yes, DRAM itself is a 64 bit device, when you run DRAM in Dual channel it is used as a single 128bit device and can be up to 10-15% performance wise, tri channel operates as a 196 bit device and can pick up another 5-9 percent performance wise, true quad channel as on the X79 mobos runs the DRAM as a 256 bit device and performance increases even a little bit higher than tri-channel.
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