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Lower CAS or more memory?

Basically not sure which to go with. Is it better to have lower CAS or more memory overall?

I'm deciding between two different Corsair Vengeance packages:

16gb (4x4) @ 9-9-9-24

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145347

or

8gb (2x4) @ 7-8-8-24

http://www.newegg.com/Product/Product.aspx?Item=N82E16820233254

The difference in price is only about $10 ($20 with the current discount). So is the 8gb-7CAS package that much better that it costs only $10 less than twice the memory at 9CAS?

Going with:

i5-3570k (Possibly, depending on price next week, if too high will go 2500k)
CM Hyper 212 EVO
AsRock Extreme3 Gen3 z68 (seeing as I can't find a valid reason to pay the price for a z77 yet)

Primarily for gaming. Will I see better performance with the 8gb 7 CAS or am I better off buying the 16gb 9 CAS? Also, any height issues with cooler and either of these modules?

Thanks!
3 answers Last reply Best Answer
More about lower memory
  1. Best answer
    I would go for more memory.

    Intel CPU's are relatively insensitive to minor changes in RAM timing, and that is what you have here - a minor change in RAM timing.
  2. Best answer selected by Rockworld3113.
  3. This topic has been closed by Nikorr
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