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uneedav8

More memory, slower system

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I have recently added another 16GB to RAM to my system for a total of 32GB. The system seems a bit slower now. Is this typical since the DIMM slots are fully populated? and making the memory controller work more? I always read that for optimal performance, get the most amount of memory while using the least amount of modules. 2 for dual channel, 3 for tri, 4 for quad, etc. The memory timings are set by XMP, and not seemed to have changed (going from 2 to 4 modules). I know more memory does not make your computer faster. How do I try to get it close to how it was before? I don't think it is my imagination, thanks!

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Did you add the same model number modules? X79 can be finicky sometimes. Did you update the BIOS? The RIVBE I have was finicky with modules until the BIOS update from earlier this year. Running 32GB with a 4960X. 

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Both your X79 and Z97 run @ 12.8GB/s max bandwidth per channel,.. so your going to notice a slight bandwidth hit on the Z97 running 16GB per channel at 2400Mhz.

Edited by Braegnok

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Both your X79 and Z97 run @ 12.8GB/s max bandwidth per channel,.. so your going to notice a slight bandwidth hit on the Z97 running 16GB per channel.

Quantity doesn't drop bandwidth...

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Did you add the same model number modules? X79 can be finicky sometimes. Did you update the BIOS? The RIVBE I have was finicky with modules until the BIOS update from earlier this year. Running 32GB with a 4960X. 

 

All the same modules, it is for the Z97 with 4790K.

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I always thought it was a bandwidth issue on my Z97 rig only having two channels with 12.8GB/s bandwidth per channel,.. I could run @ 2666Mhz 4X4GB with 8GB per channel,.. my system was fast/snappy and smooth doing normal everyday tasks,.. but if I ran 4X8GB with 16GB per channel,.. my system seemed noticeably sluggish doing same normal everyday tasks,..  :dunno:

Edited by Braegnok

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Why would 4x4GB modules behave any differently than 4x8GB modules? :confused:

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I agree it's strange,.. the memory subsystem see's one load per memory chip,.. so four modules installed that's 64 electrical loads on the bus,.. Z97 memory controler is default 1333/1600Mhz with 32GB max dependent on memory type.

 

He is running 32GB @ 2400Mhz in XMP mode,.. so perhaps the system is automatically adjusting for the higher load by either increasing the voltage a small amount; reducing the clock frequency of the memory or adding a cycle to the SPD's latency setting,.. thus slightly slowing it down,.. to keep the memory subsystem reliable.

 

Looking at EVGA support for Z97 FTW memory compatibility,.. 8GB modules listed I do not see any 2400Mhz 8GB modules listed in full-slots,.. only slots 2+4. http://www.evga.com/support/motherboard/

Edited by Braegnok

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