Originally Posted by Seldian
Title pretty much says it all. I know it has to do with Mhz on the RAM, i get that. And its the frequencies the board can use. What i dont get is the Over Clocking. So is it saying this board can use 1866, and it can be over clocked to 2000 2200 or 2400?
The board will allow you to TRY frequencies which are higher than what your CPU's memory controller allows, hence the "Overclocking" since you are running it PAST the rated specifications for (slightly) more performance.
In the real world you will only get 1-2 extra fps but in benchmarks it can help quite a bit.
Note most memory controllers (IMCs [which are built into the CPU]) can do slightly more, but once you go up to 2400 and more it probably will not be stable, especially if you run lots of DIMMs.
Now for you to run "higher frequencies" your ram must also be able to do so. Most ram manufacturers have ram which is rated to do 2133 but only a few have more (such as 2400) and almost none have any ram rated for higher.
You can overclock most ram slightly by adding a little more voltage and running it higher specced and seeing if it is stable but you cannot usually do it much.
There are a few exceptions which can "overclock" WAY more than the rated timings/frequencies like THIS
ram. I have it running at 1700mhz on 8-9-8-24 timings at 1.55v which is quite good for cheap ram.
Mentioning timings; they are the latencies or delays for "actions" in the ram (I do not want to get too complicated here but there is lots of reading which can be done on them), and there are four main ones. These can be changed to smaller numbers for (VERY SLIGHTLY) better performance but it is usually hard to change them much.
I sense I am starting to bore you.
By upgrading your ram you will not get much performance tbh but if you want to go right ahead.
There are two "main" things which affect the performance of ram, TIMINGS (latency) and FREQUENCY.
Frequency is the total amount of bandwidth which can be transferred. Latency is the timings for the communication (data transfer mainly but there are others) between the IMC and the RAM MODULES.
Also you might notice as frequencies increase, latencies do as-well, and this is because when frequencies increase there are more "cycles" within the same time period, and most ram/imcs cannot cope with ridiculously small timings, so the numbers look bigger, but they are still similar to lower frequency timings.
An example would be 1600mhz at 9-9-9-24, while 2133mhz at 10-11-10-28. They have similar timings, but the bandwidth is much greater on the 2133mhz ram. The 2133 ram will easily outperform the 1600mhz ram, but the total performance difference is very minuscule.
There are other timings to worry about which can make a difference, but these are almost impossible to change while keeping the ram stable.
Also note, sometimes the RAM will need more voltage to keep them stable. The normal for ddr3 is 1.5v (most ram is at this voltage) but they can range up to 1.65v while you can even find some as low as 1.35v. Now when you increase what the ram is rated for (an example being the samsung ram I own), to meet the larger power requirements it needs I had to bump it up to 1.55v to keep it working properly.
Some chipsets allow you to do this to the rams memory controller or the IMC (on the CPU), such as x79 chipsets. This can increase the possibility of an overclock.
Also note that if your cpu only supports dual channel ram, but you load up four dimms, you are stressing your memory controller more so it will be harder to achieve higher clocks (or overclocks) with more dimms attached.