Asus B85m-g 2x4gb and 1x8gb?

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jaydensuter789

Nov 3, 2018
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Hi, my Kingston 8gb RAM Kit (2x4gb 1600mhz) is now more than 4 years old. I decided to buy a new RAM (HyperX 8gb 1866mhz) and was wondering if I could use all 3 sticks at a time. In the manual it kind of says that I can use multiple sizes of RAMs, but im not too sure if I understood that. So could I put the two 4gb sticks in channel B and the single 8gb stick in channel A? It basically says that it is possible to do that in the manual, but I am really scared if it isnt possible.

(CPU Intel Core i5-4560k)
(GPU EVGA 1060 6GB)
 
Solution
Karadjgne
Perfectly possible.

4-X-4-8
4-8-4-X
8-4-X-4
X-4-8-4

Any of those will get you working as dual channel, as there's technically 8Gb in each, regardless of amount of DIMMs used. However, this comes with the understanding that all of the ram will run at the slowest speed and highest timings. So if that 1600 is Cas9 and the 1866 is Cas10, what you'll end up with is all the ram running at 1600 Cas9 (that's default speeds for DDR3, 1866MHz is an XMP setting). The only way to avoid that is manually OC the 1600 to 1866 (many will take that small OC bump) and leave all the ram now running at 1866MHz Cas10.

Warning: There is only One guarantee about mixing ram from different batches/kits, there are No guarantees it will work. The different...
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Dunlop0078

Dunlop0078

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Feb 13, 2014
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Mixing RAM sticks especially ram sticks of a difference size and spec can be hit or miss. Might work, might not no way I can say for sure. If it does work you will likely have to run the 1866mhz stick at the speeds and timings of your 1600mhz kit.
 
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Karadjgne

Karadjgne

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Perfectly possible.

4-X-4-8
4-8-4-X
8-4-X-4
X-4-8-4

Any of those will get you working as dual channel, as there's technically 8Gb in each, regardless of amount of DIMMs used. However, this comes with the understanding that all of the ram will run at the slowest speed and highest timings. So if that 1600 is Cas9 and the 1866 is Cas10, what you'll end up with is all the ram running at 1600 Cas9 (that's default speeds for DDR3, 1866MHz is an XMP setting). The only way to avoid that is manually OC the 1600 to 1866 (many will take that small OC bump) and leave all the ram now running at 1866MHz Cas10.

Warning: There is only One guarantee about mixing ram from different batches/kits, there are No guarantees it will work. The different ram may play nice or it may not. It may need a small voltage bump or not. It may need timings relaxing to Cas11 or Cas12 or not. Or it may work perfectly as is or not at all. I've had identical ram only 5 serial numbers different totally incompatible and had ram of different vendors, speeds, timings and voltages be perfect as is. Absolutely no way of knowing in advance. This is why it's always better to buy ram in a kit, it's factory tested for compatability, mixing ram you could swap the stick once or a hundred times to get it all working. So if it doesn't work, it's not that the ram is bad, it's just not compatible and won't play nice.
 
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Solution
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jaydensuter789

Nov 3, 2018
3
0
10
Thank you Dunlop0078 and Karadjgne. I will try it out now and see if it works, and if not ill just order the same 8gb stick again. @Dunlop0078 yes indeed, the 8gb 1866mhz stick will go down to a 1600mhz, but either way its what my crappy mainboard only supports. So either way my new RAM will go down to a 1600mhz.
 
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