Should I keep my old memory?

[Zoli]

Hello guys!
I have a quite old motherboard (asus P8H77-M) with two 1600 MHZ 4GB DDR3 memory (https://i.imgur.com/4tiqYem.png ) in it. 
As you can see in the picture the rams are different (brand and even voltage). 
Today I have ordered a new CORSAIR VENGEANCE 2X8GB DDR3 1600MHZ C9 as their replacement. 
The motherboard has 4 memory slots, so my question is should I keep these two old ones or just remove them and use the new ones dual channel? 
How does these effect my memory setup if I keep them in there? Do I lose any benefit of dual-channel? 
If I can keep them is there any rule that I should place the new ones in slot #1 and 3# and old ones to #2 and 4# fe?

Thanks for your time and the answers.

PS: first post here so apologies if I did anything wrong.

Cheers

[Canada EH]

yes keep old ram

for anything, t/s'ing

 

if you keep them in there, everything reverts to slowest stick

just leave them out of your pc and in your parts bin

[ProjectBox153]

Keep them. It's better to have more RAM (to an extent). 

[BlueChinchillaEatingDorito]

3 minutes ago, Zoli said:

Hello guys!
I have a quite old motherboard (asus P8H77-M) with two 1600 MHZ 4GB DDR3 memory (https://i.imgur.com/4tiqYem.png ) in it. 
As you can see in the picture the rams are different (brand and even voltage). 
Today I have ordered a new CORSAIR VENGEANCE 2X8GB DDR3 1600MHZ C9 as their replacement. 
The motherboard has 4 memory slots, so my question is should I keep these two old ones or just remove them and use the new ones dual channel? 
How does these effect my memory setup if I keep them in there? Do I lose any benefit of dual-channel? 
If I can keep them is there any rule that I should place the new ones in slot #1 and 3# and old ones to #2 and 4# fe?

Thanks for your time and the answers.

PS: first post here so apologies if I did anything wrong.

Cheers

More RAM > Faster speeds from Dual Channel 

 

That's my rule of thumb. 

[themctipers]

you will need it sometime in the future for troubleshooting.

or like, for a friend

or for a future kid..

 

or a future secondary pc..