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Intel i7 4790k supports 1333/1600 memory frequencies, so what's the point of higher frequencies?

post #1 of 11
Thread Starter 
If my CPU can only take advantage of 1600Mhz frequencies, what's the point of getting an 1866, 2133, or 2400? I'm thinking of just getting some 1600 9CL Vengeance Pro RAM, but 1600 at 9CL has more latency than 2133 at 11CL, but my processor can't utilize the whole frequency...so what's the point? Should I get the 2133Mhz at 11CL or the 1600 at 9CL? I only care about latency but I know that frequency and latency go hand in hand, so what's the best low latency RAM for the i7 4790k?

ASUS Z97 Mark II mobo.
Edited by Alya - 8/5/16 at 9:55pm
    
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post #2 of 11
Quote:
Originally Posted by Alya View Post

If my CPU can only take advantage of 1600Mhz frequencies, what's the point of getting an 1866, 2133, or 2400? I'm thinking of just getting some 1600 9CL Vengeance Pro RAM, but 1600 at 9CL has more latency than 2133 at 11CL, but my processor can't utilize the whole frequency...so what's the point? Should I get the 2133Mhz at 11CL or the 1600 at 9CL? I only care about latency but I know that frequency and latency go hand in hand, so what's the best low latency RAM for the i7 4790k?

ASUS Z97 Mark II mobo.
For the same reason you spent $100 more on a 4790K for gaming rather than an i5-4690K. It helps to raise minimum frame rates in general, and in effect creates better frame pacing for a more fluid experience.

http://www.overclock.net/t/1487162/an-independent-study-does-the-speed-of-ram-directly-affect-fps-during-high-cpu-overhead-scenarios
post #3 of 11
Thread Starter 
Quote:
Originally Posted by mouacyk View Post

For the same reason you spent $100 more on a 4790K for gaming rather than an i5-4690K. It helps to raise minimum frame rates in general, and in effect creates better frame pacing for a more fluid experience.

http://www.overclock.net/t/1487162/an-independent-study-does-the-speed-of-ram-directly-affect-fps-during-high-cpu-overhead-scenarios

Alright, I understand now, since the current RAM I have is faulty (getting a FAULTY_HARDWARE_CORRUPTED_PAGE BSoD) and I only really play Overwatch now and mostly care about latency and not FPS (since I get plenty of FPS as it is, well over the 144Hz required for my XL2411Z), would it make a noticeable difference in latency if I get 1600 @ 9CL in comparison to 2133 @ 11CL?
    
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post #4 of 11
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by czin125 View Post

1600 at 9CL is fine but you can gain a little more fps with 2133 at 11CL
http://www.overclock.net/t/1487162/an-independent-study-does-the-speed-of-ram-directly-affect-fps-during-high-cpu-overhead-scenarios

Since it seems like 2133 @ 11CL gives me higher FPS and lower latency in the same general ballpark of 1600 @ 9CL (1600 is about $2 less) then I guess I'll go for the 2133 @ 11CL, thanks all. thumb.gif
    
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post #6 of 11
You know, if you can get some of the used Samsung Wonder RAM (4GBx4) for cheap, they are excellent for the 4790K. I still run 4x4GB at 2133 and 9-10-10-28 timings on my 4770K. The lowest latencies really help when you're in an intense firefight (explosions, bullets, lots of stuff happening) so your fps doesn't dip -- because that's the difference between winning or losing.
post #7 of 11
Quote:
Originally Posted by Alya View Post

If my CPU can only take advantage of 1600Mhz frequencies, what's the point of getting an 1866, 2133, or 2400? I'm thinking of just getting some 1600 9CL Vengeance Pro RAM, but 1600 at 9CL has more latency than 2133 at 11CL, but my processor can't utilize the whole frequency...so what's the point? Should I get the 2133Mhz at 11CL or the 1600 at 9CL? I only care about latency but I know that frequency and latency go hand in hand, so what's the best low latency RAM for the i7 4790k?

ASUS Z97 Mark II mobo.

Your CPU can make use of whatever RAM frequency it'll boot at and run things at. If your 4790k can boot with 3000 mhz ddr3 at CL9, then it can utilize it.

Intel says 1333 and 1600 to cover their ass, so people that get ****ty IMC's can't complain and try to RMA, because 1333 and 1600 is all they "officially" test for.
post #8 of 11
Intel CPUs officially support 1333 and 1600. The RAM you buy is overclocked. There is a high chance that your CPU can handle the higher clocked RAM but there is a chance that it won't. Intel is basically saying that the integrated memory controller can and should support 1333 and 1600, if it doesn't then you can get a refund or replacement.
post #9 of 11
2133 CL11 is lower latency than 1600 CL9
2133 CL11 is higher latency than 1866 CL9 but some games may still benefit from the former

From his test, these are all decreasing in latency
GEil Evo Potenza 2666MHz DDR3 (4x4GB):
1333MHz @ CL 8
1600MHz @ CL 8
1866MHz @ CL 9
2133MHz @ CL 10
2400MHz @ CL 11
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post #10 of 11
Quote:
Originally Posted by czin125 View Post

2133 CL11 is lower latency than 1600 CL9
2133 CL11 is higher latency than 1866 CL9 but some games may still benefit from the former

From his test, these are all decreasing in latency
GEil Evo Potenza 2666MHz DDR3 (4x4GB):
1333MHz @ CL 8
1600MHz @ CL 8
1866MHz @ CL 9
2133MHz @ CL 10
2400MHz @ CL 11

However, latency isn't the most important thing. If you have to sacrifice a few NS of latency to get loads more bandwidth, then bandwidth will most likely rule supreme.
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Overclock.net › Forums › General Hardware › General Processor Discussions › Intel i7 4790k supports 1333/1600 memory frequencies, so what's the point of higher frequencies?