RAM - 8GB 1333MHz or 4GB 1600MHz? (already have 4GB 1600MHz)

Currently I have 4GB of Corsair XMS3 1600MHz RAM - 2x2GB. I'll be getting more soon. Should I get another one ($60) or a 4GBx2 1333MHz set? (also around $60) My CPU is the Intel Core i5 750 2.66GHz, which limits the RAM speed to 1333MHz. My motherboard is Gigabyte ga-p55a-ud3. Which would be better? Also, would I get any issues if I get the 1333Mhz (already having 1600MHz) if I overclock? (I likely won't though)
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  1. well if your cpu can only support 1333mhz then getting 1600mhz is pointless and especially OC. also personally im not a fan of intel so cant really advise you to upgrade but also what you use computer for? hardcore gaming? watching movies? editing HD movies? photoshop? facebook?
  2. I mainly web browse and use virtualization software (that's the key reason for the ram upgrade). Sometimes I do gaming and movie editing. I also watch movies (HD) but that doesn't require anything beyond hardware graphics acceleration, which I have.
  3. Your mobo supports 2200Mhz ram btw.
    The cpu is not limited to 1333Mhz ram it's the default speed it supports.
    You could buy the 1333Mhz kit but your other kit (1600Mhz) will run at 1333Mhz too.
    It's best to upgrade ram to kits with the same timings ,speed,and voltage for a seamless install.
    Worst case scenario is the 1600Mhz kit will default to 1333Mhz 1.5v. and higher timings.

    As long as the new 4GBX2 1333Mhz kit is the same timings and 1.5v it will work.
    It would be helpful if you posted the exact kits.
  4. OK apperantly the price difference is less than I thought. However, my current set costs $65! I'm wondering what I could use to get 4GB more that's a bit cheaper. I don't really do overclocking. My current set is already running at 1333MHz, 1.5V, 9-9-9-24 timings. It's rated for 1600MHz, 1.65V, 9-9-9-24 timings. The sets I'm looking at are 1333MHz, 1.5V, 9-9-9-24 timings. Would there be any issues?
  5. Hold - RAM - 8GB 1333MHz or 4GB 1600MHz? (already have 4GB 1600MHz)

    Best to get the another SET of same -> (already have 4GB 1600MHz)!!!

    Don't mix-match, and if the "(already have 4GB 1600MHz)" is EOL then get the same brand with the EXACT same: Frequency, CAS Timings and Voltage.
  6. Why not mix and match? It would cost more to get more RAM that's the same higher speed.
  7. Best answer
    Why, because they might not work together and the BIOS will turn them off.

    1600 9-9-9-24 @ 1.65v
    1600 9-9-9-24 @ 1.50v
    Won't work most of the time; voltage disparity

    1600 9-9-9-24 @ 1.65v {JEDEC 1333 9-9-9-24 @ 1.50v}
    1333 8-8-8-24 @ 1.50v
    1333 9-9-9-24 @ 1.50v; might work if Set 2 will work with higher CAS

    1600 9-9-9-24 @ 1.65v {JEDEC 1333 8-8-8-24 @ 1.50v}
    1333 9-9-9-24 @ 1.50v
    1333 9-9-9-24 @ 1.50v; might work if Set 1 will work with higher CAS

    1600 9-9-9-24 @ 1.65v {JEDEC 1333 7-8-7-24 @ 1.50v}
    1333 8-8-8-27 @ 1.50v
    1333 9-9-9-27 @ 1.50v; might work if Set 1 and Set 2 'blended' CAS is compatible

    Auto - good luck! You'll need to Manually set CAS, Frequency and maybe voltage. In general it's not anything that I recommend. At best you get the WORST of each set.

    My advice get the same as what you have now.
  8. Dang it, the BIOS disabled the 3rd and 4th ones no matter what order I tried. I'll have to try what you mentioned then.
  9. Best answer selected by livebriand.
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