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One day, a colleague and I discussed a problem. His computer now uses two 4GB of memory. Now 8GB of RAM is not enough. I want to add it to 16GB, but I don't know how to add it.
The first option is to add two more 4GB of memory, but this basically obliterates the possibility of further upgrades.
The second option is to add two 8GB directly. If you use this solution, you will have 24GB of total memory. It will be enough for a long time, but the cost is too high.
The third option is to add only one 8GB, which can have 16GB of memory capacity and retain the upgrade potential, and this is also the most cost-effective method, just insert three memory does not know if there will be any negative impact.
In fact, Option 3 is feasible because Today's mainstream platforms support flexible dual-channel technology, which allows two 4GB to form a dual channel and the new 8GB to work in single channel mode.
It’s just that there is a big impact for a while and I can’t really think of it. Anyway, there’s so much memory in the office, just try it out.
So I really took two 4GB and one 8GB of memory into a motherboard, because the frequency is 3200MHz, I thought that there is no problem, the result is a problem when booting, directly point no light...
In the end, we first unplug the 8GB, then enter the BIOS to restore the default settings, then plug in this 8GB of memory to light up.
However, things are not that simple.
Into the system, this pile of 3200MHz memory is running 2133MHz.
It is impossible to open XMP directly. The timing of the two sets of memory is not consistent.
The correct way to open is First open the XMP option in the BIOS.
Then manually change the timing, and only adjust to the higher set.
The FlareX 8GB 3200MHz on hand can work at 14-14-14-34 timing, but can only be adjusted according to RipjawsV 4GB 3200MHz 16-16-16-36.
This is the result of only two 4GB of memory inserted.
This is the result of inserting two 4GB plus one 8GB test, the overall performance of the memory has some decline, but it seems that the overall impact is not big.
Later I thought that the test method was not right. This only shows that the system will give priority to the faster dual-channel memory. So I used Ramdisk to take up more than half of the memory and ran a test again.
This time, the software finally ran out of the performance of the single-channel memory, the speed of the memory was directly reduced by half, and the memory delay was added.
Stability is no problem, you can pass memtest
This two 4GB plus an 8GB solution is feasible. When the memory usage is low, there is no problem. However, if the memory usage is more than half, the single channel will be used, and the bandwidth will be directly halved. Of course, the actual impact is relatively small. Compared with the single-channel and dual-channel memory, the performance of the CPU is very small.
In fact, the biggest problem with this flexible dual-channel solution is not the performance impact, but the memory compatibility problem. The most troublesome thing is if these three memories work properly.
When you add a completely different memory in the dual channel system, the biggest problem is how to boot, after solving this problem, the next problem is only a small problem.
