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DDR3 1333 vs 1600

post #1 of 17
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I plan on upgrading my rig to a Athlon II x3 450. And the board I plan on buying supports up to 1600MHz (OC). What im wondering is 1600MHz @ 9-9-9-24 better then 1333MHz @ 7-7-7-21? Because there is only a $1 price difference between the two. I know speed > timings but there really isn't a big jump in speed between the two. But there is a nice drop in timings. I was planning on getting Samsungs 30NM memory and running 1600MHz @ 7-7-7-21 but they are sold fresh out. Or should I wait for restock?
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post #2 of 17
From what I've heard for AM3 systems you'll generally want the lower timings, for performance and stability as well.
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post #3 of 17
OP-

You are unlikely to be able to tell ANY difference between any RAM running at 1333 vs. 1600 MHz. in REAL APPLICATIONS. FWIW some applications like higher frequency and some like tighter latencies, but the difference in performance is so minute you can only see the change via synthetic benches. In synthetic benches that show theoretical performance the 1600 MHz. RAM would likely show a slight benefit over the CAS 7 latency - but it depends on the benchmark used and what emphasis the benchmark places on speed vs. latency, so there is no exact answer to your question.

The exceutive summary is either higher frequency or lower latency will produce about the same performance in real applications. Tighter latencies especially with frequencies above ~1333 MHz. produce diminishing returns as one clock cyles becomes less in REAL TIME as the frequency increases. Since DDR3 RAM at ~1333 MHz. is not a system bottleneck on a typical AMD or Intel desktop PC, there is negligible potential for gains unless you are using a Llano APU where the GPU section can benefit from the higher frequency.

Thus it's best as always to Buy What Makes YOU Happy as you and your PC are unlikely to be able to tell the difference in the minute change in RAM performance.

The link below may help you understand some of the issues?

http://www.overclock.net/t/1264141/memory-gskill-tridentx-2400-mhz-at-crosshair-v-formula-and-fx-8150
post #4 of 17

1600 9-9-9 will win over 1333 7-7-7 by I reckon a few ns and about less than 100Mb/s.  It's really not worth arguing over.  I recommend going with what is cheaper and that usually tends to be the 1600Mhz kits; they usually are binned better than 1333 even if the 1333 kit runs at lower timings.

 

It's not that low timings are better on AMD systems, it's just that they actually make a difference on AMD platforms unlike on Intel platforms where timings don't seem to be nearly as important.

post #5 of 17
Quote:
Originally Posted by xd_1771 View Post

It's not that low timings are better on AMD systems, it's just that they actually make a difference on AMD platforms unlike on Intel platforms where timings don't seem to be nearly as important.

proof.gif
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post #6 of 17
 
 
 

Some of my own tests:

3k9991final.png

3k6861final.png

 

On Intel platforms you wouldn't see a 400-500MB/s bandwidth jump from a timings change alone.

 
post #7 of 17
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

 


 


 


Some of my own tests:



600x220px-LL-f0b41d7e_3k9991final.png
600x219px-LL-66617bfd_3k6861final.png

On Intel platforms you wouldn't see a 400-500MB/s bandwidth jump from a timings change alone.
 

I placed my order I bought two of these. You recon I could match your 6-8-6-20 timings with a slight OC on them? I have seen people getting 7-7-7-21 on them @ 1600MHz. Even that would make me happier then G-Skill 1333MHz memory with a timing of 7-7-7-21.
Edited by Warmonger - 6/6/12 at 4:41pm
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post #8 of 17
Intel Memory controllers are much better than AMD's. Even with bulldoer's improvements, Its still a solid 15% slower am i not correct? This is probably why you see a bigger gain on AMD systems. But in my experience, the higher frequency seems to make my computer respond better and seem faster rather than lowering latencies. Also, for games i'd also say higher frequencies. As for Integrated GPU's, again both lowering the latency or increasing the speed would make it faster. On my hd 3000 at 1850mhz and my memory at 2133 @ c12, Games aren't nearly as bad. It's really a moot point.
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post #9 of 17

If exploring more bandwidth interests you, the Samsung kits with the 30nm ICs OC very good for the price but I'm not entirely sure of the timings they do at 1600.  I haven't largely explored the scaling and while as far as I'm aware 1600 at CL7/6-8-6 will provide similar bandwidth to 1800 @ CL9, 2000 (which the Samsung kit are more known for reaching) @ CL9 will be somewhat ahead.


So, random thinking but what do you do on this build anyway?

post #10 of 17
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

If exploring more bandwidth interests you, the Samsung kits with the 30nm ICs OC very good for the price but I'm not entirely sure of the timings they do at 1600.  I haven't largely explored the scaling and while as far as I'm aware 1600 at CL7/6-8-6 will provide similar bandwidth to 1800 @ CL9, 2000 (which the Samsung kit are more known for reaching) @ CL9 will be somewhat ahead.

So, random thinking but what do you do on this build anyway?
Its an upgrade from my classified. I do minor gaming and game development with my machine. My single core Athlon 64 has been powering most of what I want to do, except a few games that are CPU bound like Prototype etc (stands at 17 FPS on max settings on Athlon 64 3800+ cpu bottleneck). Other then that its just to get something fast enough to run Windows 7/8 without questioning my next task. I'm also hoping it will unlock I payed a little extra for the A960G+ (like $6?) for ACC to give it a try. I figure if not then its worth the extra $6 to have a upgradable socket.
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