Mixing RAM sizes

[Stoyo71]

Hey guys!
Sooo, I'm running a 1155 rig with an i3 and a rx470 all on an asus p8b75m lx motherboard. Originally I had a 2x4gb Adata ddr3 kit ( 2x AD3U1333W4G9-B dimms) , but now I want to upgrade it to 12gb, as 1x4 and 1x8 ( the mb only has two slots and I don't want to buy a 16 gb kit as I do not have the money). I found a used 8gb single dimm, an Adata AD3U1333W8G9-B, which by the name I presume is the exact same thing as mine, but just... more? I kknow there are issues with mixing different ram speeds and manufacturers, but should there be an issue if the stick I'm buying is the exact same thing, but just bigger( at least i"m hoping it is)? I've already ordered it, so it doesn't really matter, I want to try it either way, but just want to know what to expect. I decided to post here as I'm a fan of LTT media group , but unfortunately Lord Linus,  or any other for that matter, don't seem to have a video addressing this scenario( or I just might have issues finding it). 

Thanks to all!

[VVoltor]

"Asymmetric channel configuration will cause the board to operate memory in lower-performance interleaved mode and since the memory controller only supports one set of timings for all installed RAM, all your memory will have to follow the weakest DIMM's timings.

Aside from that, it should work unless you run into odd interoperability issues that nobody can predict."

[Anghammarad]

You can always do that, but keep in mind, dualchannel isn't working then. 

 

aaand what VVoltor said =) 

[Stoyo71]

Can you explain a bit more? Kind of new in this area. What is the issue of not operating in dual channel? 

 

[Stoyo71]

5 minutes ago, VVoltor said:

"Asymmetric channel configuration will cause the board to operate memory in lower-performance interleaved mode and since the memory controller only supports one set of timings for all installed RAM, all your memory will have to follow the weakest DIMM's timings.

Aside from that, it should work unless you run into odd interoperability issues that nobody can predict."

Timings as in frequency, right? They are both 1333, so this shouldn't be a problem right? Sorry, RAM is just not really my comfort zone

[VVoltor]

1 minute ago, Stoyo71 said:

Timings as in frequency, right? They are both 1333, so this shouldn't be a problem right? Sorry, RAM is just not really my comfort zone

Dual channel will increase your performance, not by much though, especially in games. The separate channels allow the memory controller access to each memory module.

 

Speed, or frequency, is measured in Mhz.

Timings, or CAS latency, is the delay time between the moment a memory controller tells the memory module to access a particular memory column on a RAM module, and the moment the data is available. It's usually described something like CL16-16-18 (numbers may vary)

 

You can use GPU-Z to see both speed and timings of your current RAM.