XMP Confusion - Lowering CPU Speed to Run DDR4-3000?

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E

Equatis

Commendable
Mar 30, 2016
2
0
1,510
Hello Community,

Haven't built a PC in quite some time. Recently updated my six year old rig with the following items:

- Intel i7-5820K (Haswell-E)
- Corsair Vengeance LPX DDR4-3000 16GB (4x4)
- ASRock X99 Extreme4 2011-V3

I'm new to XMP profiles. I noticed that the memory was running at 2133Mhz and read that this was the normal stock speed for the memory/X99 setup and that I needed to load the correct XMP profile for it.

Link:
http://www.tomshardware.com/answers/id-2364890/ddr4-memory-run-speed.html

There is only one XMP profile for DDR4-3000 and when I select it everything works great. However, loading this XMP profile lowers my CPU speed to 2250 which isn't a lot, but it's lowering my Valley benchmark by about 200 points.

DDR4-3000 is stable, but I notice absolutely no difference in performance. I'm irritated that I see no performance change, but my benchmarks are dropping because the XMP lowers the CPU speed.

My question - How can I get this board to run DDR4-3000 and not affect the CPU/Gaming performance?

Links I've been reading:

http://www.anandtech.com/show/7364/memory-scaling-on-haswell/2?_ga=1.237210756.562981710.1456291658

http://www.anandtech.com/show/7364/memory-scaling-on-haswell/2?_ga=1.3287348.562981710.1456291658
 
Solution
Tradesman1
Do you have the latest BIOS and mobo drivers. The DRAM should be pretty much independent, running the DRAM at 3000 shouldn't affect the CPU speed, sort of sounds like you may be using the ASRock software or tweaking utilities, those things often end up with odd results
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
67,883
40
126,960
Do you have the latest BIOS and mobo drivers. The DRAM should be pretty much independent, running the DRAM at 3000 shouldn't affect the CPU speed, sort of sounds like you may be using the ASRock software or tweaking utilities, those things often end up with odd results
 
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Solution
E

Equatis

Commendable
Mar 30, 2016
2
0
1,510
Thanks Tradesman.

I'm not scratching my head quite as much. Things are starting to make more sense for this old man.

Last couple times I purchased memory in the last ten years, if you set the correct timings the memory speed would show correctly. This setup was new to me where 2133 is the stock speed and you're purchasing memory that "should run stable" at 3000Mhz but needs to be overclocked.

Anywho, I set the voltage to 1.35, set the correct timings which was 15-17-17-35, and had to change the BLCK to 125 which lowers the CPU speed. Then I go to the CPU tweaking part and changed the multipliers so it's at DDR4-3000 running at 3.5Ghz.
 
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