Originally Posted by DeadlyDNA
Mostly the difference is the Speed the Ram operates, My best recommendation and i think most in Overclocking agree.. You want to have highest Speed in MHZ for case of overclocking if using gear ratio/base block adjustments. This is so when you use say 1.25 Strap/Gear ratio your Ram speed changes to faster operating speed. In short overclocking with Base clock/Gear Ratio your Ram increases speed along with CPU. If you used Ram strap/Memory strap to copensate for overclock generally you can get close to operating speed for RAM to increase stability
In the specific case of MSI Big Bang Xpower II
We use your screenshot as example:
You have your settings as highlighted by yellow arrows. The last arrow indicates your Actual ram speed. as a result of your settings.
Already it is Overclocked with 107 bus x1.0strap.
If you lower your DRAM Frequency =  down to  option
Memory speed would now be under Rated speed. This is usually Preferred for testing/overclocking CPU and Keeping ram Close to rated speed.End result is this,
i7 3820 overclocks with Base Clock/ Gear Ratio/Multiplier
1600Mhz DDR3 uses following straps when not overclocked >1600mhz >1333Mhz>1066Mhz>800Mhz>
2400Mhz DDR3 uses following straps when not overclocked >2400Mhz>2133Mhz>1866Mhz>1600mhz >1333Mhz>1066Mhz>800Mhz>
More versatility when overclocking because more options to choose when using higher CPU Base clock/Gear Ratio/Multiplier.
when overclocking CPU keeping Ram speed under or around Rated factory speed helps eliminate Ram from problems that arise and focuses on CPU
Thanks again for exchanging opinion and thoughts.
After all I have return to - Our fellow - Sin0822 which explain on 2010-11 (little out of date);
Please be aware memory clock is VERY dependent on the CPU. Unlike SB where every CPU could do 2133mhz, with SBe not many can do 2400mhz. It is also recommended that you buy a quad channel kit rated for your target clock.
So Quad it is the Best; I was wrong - Kip69 - full Honor in return;
BLCK Straps Section:
First we have to realize that SBe also has BLCK overclocking. SB also had slight BLCK overclocking; the base frequency of 100 MHz could be OCed 5-7%. The same thing is possible with SBe, so you could look at 106-107 MHz BLCK on average. The issue with going higher is that the BLCK is now tied to the PCI-E bus and DMI. You can corrupt your OS and your GPUs by increasing the BLCK too much. Otherwise the CPU also won’t want to do it either. So Intel introduced BLCK straps, multipliers really, at 1.00(stock), 1.25, 1.67, and 2.5.
So final CPU frequency = CPU Multiplier X BLCK X BLCK Strap.
Memory Frequency= Memory Multiplier X BLCK X BLCK Strap
Since the memory frequency is also tied to the BLCK Strap you need to pay attention to it. Most users will just OC with 1.00 BLCK Multiplier, as it is easier. BLCK straps of course let you use frequencies like 2000 MHz memory speed that previously were very hard/impossible to produce. Also the BLCK multipliers don’t really increase performance, how do I know? Well I tested it. I asked myself the question, “at what frequency can I use the 1.00 and 1.25 multipliers, but also have the same memory and CPU frequency?” Answer: 4.00 GHz CPU and 1333 MHz Memory, here were my results:
It seems that the BLCK straps are virtual. They do however offer the benefit of hitting frequencies that cannot be done with stock multipliers. For instance if you want to get 2000 MHz memory, you have to use a strap.
There after I went to these web pages;
So I have realize that the 16GB or 32 GB memory are built for servers;
Finally and according to my understanding;
The report said this menu is useful for finding out if you need more DRAM, but does not tell you if the memory you have is fast enough to meet your needs. For that, there are free software programs available to help users identify how their device performs. According to the report, CPU-Z is one of the best programs available. After downloading it, users simply need to go to the SPD tab to get the details they need about their memory.