Matching RAM Speeds

[Vicendithas]

Hello,

 

I have a quick question that I've tried finding a good answer to, but I'm not finding what I'm looking for.

 

I have a friend that is upgrading the RAM in his computer. I'm not sure what exactly he is running, but it's something relatively modern, and the RAM slots are coded in 2 different colors (indicates dual-channel to me). He is currently running a 4GB stick (PC3-12800 with timings 10-10-10-27) and a 2GB stick (PC3-12800 with timings 11-11-11-28). I attached CPU-Z screenshots of those modules. He has these in the same color slots and I understand that in this configuration, it will use the timing of the slowest module.

He is planning to get another 4GB stick (PC3-12800 with timings 10-10-10-27, link http://www.frys.com/product/7795018) and is planning on matching it in the same channel as his other 4GB stick and moving the 2GB stick (with the slower timings) to the other color slot. He doesn't have the money to buy a full kit at the moment and is making do with what he can find.

 

I'm wondering if matching the timings of the new stick to the old stick in the same channel will allow one channel to run at the faster timings (10-10-10-27) while the other channel runs at the slower timings (11-11-11-28), or if all of the RAM will still run at the slower speed because of that 1 slower module.

 

I appreciate any information you guys can give me.

 

Regards,

 

Vincent

[Oxydoreduction]

Hi,

 

All the RAM will run at the speed of the slowest stick, just check the "Memory" tab of CPU-z.

 

Which CPU/MOBO combo does he have?

[ARikozuM]

RAM will run at the slowest speed of all sticks and CAS values will be for the slowest stick in each channel.