The side effects of altering CPU's base clock

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Tyekx

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Apr 28, 2015
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Dear Community Members,

I am currently studying for my midterm about CPU (pipelines, solutions for high efficiency and such) and memory (timings and technologies), and also testing it on my computer, so I bumped into a few things that was interesting and honestly I have no clue where else to ask but here.

So my first question would be, why does the memory frequency increases when I increase the base clock? Or from an other view, why does not when I change the multiplier? At first I thought its because the memory controller needs to be synced with the CPU but I got into hard thinking at this point as well

My other question, if I change my BCLK and the ram runs at 1440Mhz, is it a problem? or can it cause one? I mean its not a beautiful round number like 1866Mhz or 1333Mhz. I tried it, put it under heavy load with that prime95 for about 50minutes and it went fine without failed calculations.

My last question is, if I have a 4820K cpu, do I need to alter voltage if I overclock just up to 4.2, 4.3Ghz? Its more of a question for the future because I dont think I need that horsepower just yet.

Thanks in advance!

 
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1. The base clock is like a reference for just about everything on the cpu.
Example, your CPU frequency is determined by the following equation:
BASECLOCK x BUS SPEED x CPU Ratio (multiplier)
So for my overclocked 4790K my bus and base clocks are stock, so my equation:
10x100x48=4800 MHz or 4.8 Ghz
EDIT: ^Numbers might be wrong here, but the example still serves it's purpose

Your RAM speed is determined much the same way...it's slightly different, but it is still dependent on the base clock.

2. Running your RAM higher than rated speeds is OK, but can be instable. This is especially problematic with RAM as a crash with due to ram glitching can corrupt your OS.
1440 Mhz isn't *too* high, but the quality of your RAM plays a huge role...
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jordan1794

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Dec 21, 2014
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1. The base clock is like a reference for just about everything on the cpu.
Example, your CPU frequency is determined by the following equation:
BASECLOCK x BUS SPEED x CPU Ratio (multiplier)
So for my overclocked 4790K my bus and base clocks are stock, so my equation:
10x100x48=4800 MHz or 4.8 Ghz
EDIT: ^Numbers might be wrong here, but the example still serves it's purpose

Your RAM speed is determined much the same way...it's slightly different, but it is still dependent on the base clock.

2. Running your RAM higher than rated speeds is OK, but can be instable. This is especially problematic with RAM as a crash with due to ram glitching can corrupt your OS.
1440 Mhz isn't *too* high, but the quality of your RAM plays a huge role. Increasing it too much will require you to increase the DRAM voltage in order to keep it stable. You can download Memtest86+ and make a bootable flash drive to test your ram for stability.

3. it depends on your chip, however I do think you will need to change the voltage to hit those speeds with that chip.
To give you an idea of how different chips can be, some people need 1.35 or higher vcore in order to hit 4.8 Ghz with their 4790K's (for safety of your chip it's highly suggested to stay under 1.3) But with my 4790k I was able to hit it with 1.265 vcore.

The stock vcore is different for all chips, but yours should be between 1.1 and 1.2. In order to hit 4.2 you will probably need between 1.2 and 1.275.
But again, all chips are different...another worry is temperature, even a good chip that needs a low vcore can run hotter, or cooler than other chips...
Be very careful, you generally want temperatures under during a prime test 80, mid 80's can be safe but it's on the extreme edge.

Give a read here:
http://www.tomshardware.com/forum/id-1808604/intel-temperature-guide.html

I think I covered your questions, but if you have more feel free to ask, or if I missed anything. I'm not an expert, and I'm actually fairly new to the overclocking scene, but I've delved deep (my wife doesn't appreciate all the time I've spent on it lol)
 
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