DDR4 3000 running at 2400?

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b22222c

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Hi i bought G.Skill Ripjaws V Red DDR4 3000 PC4-24000 32GB 4x8GB CL15 with x99 mobo and i7 5820k. Out of the box in windows 10 ram information say 2400mhz and after i overclock say 2933mhz(Above that PC dont turn on)... With this ram shouldnt i get 3000mhz out of the box before overclock? Dont say 3000 in the ram description?
 
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13thmonkey
memory controller is on the CPU not on the Mobo.
it can only go up to 2133 stock, anything more than that is an OC of an element of the CPU.
Here there are three components to the OC, can the CPU do it, can the mobo do it, and can the memory do it, you've got headroom on the mobo and ram, but the CPU is letting you down, it's the silicon lottery, 2933 is therefore a +800 OC from max stock.
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13thmonkey

13thmonkey

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memory controller is on the CPU not on the Mobo.
it can only go up to 2133 stock, anything more than that is an OC of an element of the CPU.
Here there are three components to the OC, can the CPU do it, can the mobo do it, and can the memory do it, you've got headroom on the mobo and ram, but the CPU is letting you down, it's the silicon lottery, 2933 is therefore a +800 OC from max stock.
 
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Solution
13thmonkey

13thmonkey

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Jan 10, 2006
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it's almost (but not quite) at an architecture level. each tick and tock might allow an extra step, so sandy bridge was 1066 to 1600 (pentium through to extreme), ivybridge made 1600 more accessible, and went from (1333 to 1866), haswell went from 1333 to 2133.

So to get to 3000 as stock, is several more jumps, I think that'll be 2-3 generations away at least, DDR4 may improve that I'm not sure of the clock speed jumps any more, it was 266 per jump, so that's 3 to 2933 and 4 to 3200.
 
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Tradesman1

Tradesman1

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___________________________

Many of the Skylake CPUs (at least the 6600K and 6700K) can run 3000-3200 while at stock, depends on the individual CPU of course.

 
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13thmonkey

13thmonkey

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useful to know, I've not got my head into skylake naming conventions yet, I know I'm not upgrading for another 2 gens at least.
 
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Tradesman1

Tradesman1

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While the mobo might support it the primary factor is the MC (memory controller) in the CPU. The higher data rates are often limited to the higher end CPUs or exceptional lower CPUs, with a 5820K at 4.2 go into BIOS and try enabling XMP, set to 3000, manually set the DRAM voltage to 1.4 and set the VCCSA (system agent voltage) to 1.2 and give it a try
 
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b22222c

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The maximum i can get with XMP enabled and without change things i dont know is 4305mhz on cpu and 2933mhz on RAM. Is this good?
One thing i noted is that on cpu, motherboard say i have 4305mhz but on windows 10 task manager say 4,06mhz... is this normal?
 
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