Far as iv read ram speed really only benefits apus higher clocked ram actually made a differance in integrated graphics on apu. Seen a article on maxium pc about this very subject they tested 1800-2400mhz I think.
Iv read higher rated kits like the 2400mhz ones help in Encoding and Rendering Tasks. Why I went with Corsair Dominator's Platiums for my Ultra Highend Rig just waiting on last kit to arrive 64GB of DDR 3 2400mhz should do well with cache features on ssds and a Ramdrive.
But i have seen negative effects of memory running out of proper spec. Load time increases ect.
Im not saying a properly timed 2400 mhz kit will be noticeable over a properly timed 1600mhz kit.
But i am saying why not get the faster kit esp if they are similarly priced.
One stipulation i will throw out to you though is that for instance many 2133 kits will run @ 2400-2800mhz "even sometimes 3000mhz" speeds with often same or lower timings then the actual 2400 kits will do.
Thats the route i would take. save a few $ and get same or better performance just do a tad bit of research first.
I haven't had luck ocing the 1600Mhz kits I do have but Most will run lower then 9-9-9-24-1T Standard timings already so Im content with their performance.
I would just make sure the sticks you buy are tightest timings so you don't experience increased load times and latencies on the mem bandwidth.
I would not be surprized if my 1600mhz 7-7-7-18-1T kit is just as fast as my 2666mhz 11-13-11-30-2T kit
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