DDR3 Upgrade from 4GB -> 8GB, ok to mix?

[statik213]

I've got 2x2GB DDR3 right now, and they are CAS 7 rated. I got these last year when I was building my system. They work great w/ my Core I7 860.
Existing ram:
G.SKILL Ripjaws -- DDR3 1600/7-7-7-24/1.6V
http://www.newegg.com/Product/Produc...82E16820231279

Newegg is having a special for this set of RAM this afternoon ($65 AR, starting 1pm Eastern time).
OCZ Flex II - DDR3 1600/8-8-8-24/1.65V
http://www.newegg.com/Product/Produc...-567-_-Product

My motherboard is an Asrock P55 pro , and it seems to be picking up the XMP profile at 1600 with the 7-7-7-24 timings. I don't see any other XMP profiles for me to choose from in my BIOS. Is there a chance that it will not "mesh" with the OCZ and end up being worse than 8-8-8-24?

Anyways, I'm not sure how much of a performance difference there will be w/ the different timings. I'm not OCing the system, so it's probably not that critical.

Do you guys see any reason not to get the OCZ Kit? $65 seems to be a great deal.

I do a fair amount of gaming on this system (tf2, sc2 etc) and sometimes run 2 or 3 VMs at the same time.

 

[LokutusofBorg]

You'll have to run all the RAM at the same timings, I believe. So maybe you could manually change your current RAM to 8 8 8 24 and run it that way. If you have problems you'll know before you go spending money on that new RAM.

 

[Rifter]

you will have a much better chance of it working well if you pick ram with the same timings and voltage.

 

[kalniel]

It should work fine at worst common denominator, plus whatever adjustments you need for running 4 banks.

 

[statik213]

Thanks for the responses guys. I decided to pass on that RAM since it's an oversized module and wouldn't have fit side by side w/ my other sticks.
Newegg did a pretty good job of covering up all side profiles

RAM prices seem to be dropping on the plus side though