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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 2177 } 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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August 22, 2014 6:49:27 AM

I have been debating this myself for my next rig. weighing whether its worth it to get an X79 board for the quad channel. Considering X79 board and corresponding chip would add another $150 to my budget, I am not sure it would be very value happy. If it would give literally double the speed I might consider it but not for a 25%ish bonus.
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