PC-10700 x PC-12800?

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UnseenLight

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Jul 3, 2017
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510
So i got 4 slots of memory on mainboard. I'd love to make dual-channel configuration to optimize the system speed but apparently, after i checked it, there are PC-10700 and PC-12800 conflicting, although in different channel.

Heres the conf:

Slot 1: 4 GB PC-12800 800 MHz
Slot 2: 2 GB PC-10700 667 MHz
Slot 3: -
Slot 4: 2 GB PC-10700 667 MHz

So the question is, do the different speeds conflicting although not in the same channel? Can I install a new 4 GB PC-12800 Memory onto Slot 3 (to make it like Dual channel 1-3 and Dual Channel 2-4)?? I wont bother buying 2 new pieces of PC-12800 memory to replace those two PC-10700. thanks
 
Solution
photonboy
1) Your system will run at the lowest speed. Not a "conflict" per say but all the memory has to run at the same speed.

2) With only three sticks of memory you are running SINGLE CHANNEL so effectively chop that speed in half. (A "1333MHz" kit or even single stick can be thought of as 2x667MHz with two sticks, but 1x667MHz with one stick...doesn't matter if the other "dual-channel" kit is faster as first it won't run dual-channel now so each stick AFAIK should be 667MHz).

3) You can buy another stick, which should DOUBLE the bandwidth for the reason above, so effectively it will go from:

a) 8GB at 667MHz, to
b) 12GB at 1333MHz

4) You will want to run MEMTEST86 to see if it's working properly, and if not you may need to mess around...
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photonboy

photonboy

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Jun 20, 2006
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1) Your system will run at the lowest speed. Not a "conflict" per say but all the memory has to run at the same speed.

2) With only three sticks of memory you are running SINGLE CHANNEL so effectively chop that speed in half. (A "1333MHz" kit or even single stick can be thought of as 2x667MHz with two sticks, but 1x667MHz with one stick...doesn't matter if the other "dual-channel" kit is faster as first it won't run dual-channel now so each stick AFAIK should be 667MHz).

3) You can buy another stick, which should DOUBLE the bandwidth for the reason above, so effectively it will go from:

a) 8GB at 667MHz, to
b) 12GB at 1333MHz

4) You will want to run MEMTEST86 to see if it's working properly, and if not you may need to mess around with the timings and frequency settings (like raise CAS).

Obviously mixing memory types is hit or miss. I've done it in the past and had it fail, then tweaked the BIOS settings and passed MEMTEST86.

5) How important the bandwidth also depends on the CPU and program used.
 
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Solution
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UnseenLight

Prominent
Jul 3, 2017
12
0
510
Thanks for your answer.. I can understand the point but from Point 3 of yours, does it mean i can make it dual channel if I added 4GB PC-12800 on slot 3? so thats 12GB right?
 
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