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1200MHz CL6 vs. 1600MHz CL8 DDR3

post #1 of 10
Thread Starter 
So..
My stock values are 1600MHz with CL8, I want to overclock my system, and I need to fiddle around with the BCLK, but I don't want it too high due to system instability.
So I tried going 1800MHz with CL9, but that didn't work at all, then I tried 1200MHz at CL6, prime blending for a while now, no immediate errors yet.
Seems stable, I'm just wondering since the access time is the same, 5ns, whether I will see any difference in performance due to the reduced clock frequency.
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post #2 of 10
bench em and see, I think 1600 cl8 would perform better but that's just my opinion

use aida's cache and memory benchmark, here's mine at 1643 8-8-8-20:


Edited by ssgwright - 5/1/11 at 6:59am
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post #3 of 10
Seeing as how they have the same absolute latency, the only other rule of thumb I hear is that AMD prefers timings over frequency.

I would say no to your question, but you could run some benches just to kill the curiosity.
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post #4 of 10
Thread Starter 
How can I accurately bench stuff such as rar unpacking or something, I also want real life situations.
Attachment 208336Attachment 208337
SuperPi test:
1200 CL6: 4M Calc 1:47
1600 CL8: 4M Calc 1:51
Doing vantage now to see if there's any real difference.

1200 CL6 is in blue and 1600 CL8 is in red.
Code:
Graphics Score11332.69168/11300.16411(0.2878%)
CPU Score12350.74343/11791.04137(4.7468%)
Jane Nash36.24311447/36.192482(0.1399%)FPS
New Calico30.04128647/29.8998127(0.4732%)FPS
AI Test1592.393799/1512.882813(5.2556%)operations/s
Physics Test19.29879007/18.60872956(3.7082%)operations/s
So, I guess the 1200 CL6 is better, slightly at least, better in SuperPi, better in Vantage, even in the graphics department.


Edited by naikee - 5/1/11 at 9:08am
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post #5 of 10
try 1600 cl6 if ur ram capable...
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post #6 of 10
Thread Starter 
It wont even do 1600 CL7 :/

I did another test with 1500MHz CL7
Code:
Graphics Score11340.24953
CPU Score12254.76319
Jane Nash36.32877731FPS
New Calico29.99769402FPS
AI Test1577.393433operations/s
Physics Test19.21474197operations/s
1:46 in SuperPi 4M
Edited by naikee - 5/1/11 at 11:11am
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post #7 of 10
looks like you found the sweet spot in 1500mhz CL7. If you can get the 1500mhz CL7 and it's stable, try to increase your CPU-NB frequency to 2800+mhz if you can. Should show a nice increase as well!
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post #8 of 10
Try 7-8-7 rather than 7-7-7
post #9 of 10
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Try 7-8-7 rather than 7-7-7
Hmm, why? Would it be better? How is that?
Edit: It's not stable at 7-8-7, I'll try stress testing 7-7-7 more now.
Edited by naikee - 5/1/11 at 12:39pm
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My System
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post #10 of 10
Some RAM ICs prefer that the tRCD (that middle number) is higher for stability
after all 7-8-7 improves over 8-8-8
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