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Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion - Page 137

post #1361 of 2062
Quote:
Originally Posted by Xinoxide View Post

try 9-10-10-27 1T.
may need a slight bump in voltage.

Thanks I'll give it a shot, it's first on the agenda tomorrow! All that silly work stuff can wait, tweaking my ram to the max takes precedence!
 
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post #1362 of 2062
Failed memtest 4.0 so far at 9-10-10-27, 10-10-10-27 all 1T @ 2133. Went all the way up to 1.55v and major bumps in VCCIO/SA. Workers failed on P95 blend test also.

I'm memtesting at 9-9-9-24-1T 1866 now.

I might try to get 8gb going at 9-10-10-27 2133 next week. If I can do that I have a dilema... Best folding PPD is my goal.
 
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post #1363 of 2062
Quote:
Originally Posted by DJSticky View Post

Failed memtest 4.0 so far at 9-10-10-27, 10-10-10-27 all 1T @ 2133. Went all the way up to 1.55v and major bumps in VCCIO/SA. Workers failed on P95 blend test also.
I'm memtesting at 9-9-9-24-1T 1866 now.
I might try to get 8gb going at 9-10-10-27 2133 next week. If I can do that I have a dilema... Best folding PPD is my goal.

Try to lower your vccio and vccsa voltages a tad. I don't know what constitutes "major bumps", but ram can become unstable if too much voltage is applied AND it could possibly degrade your intel memory controller which will make things harder on yourself. I have 1.2v to my vccio and 1.14v to my vccsa voltages to achieve 2400mhz. If I go slightly above those voltages, it is unstable.

You may also need to boost your cpu voltage a tad.
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post #1364 of 2062

or try vccsa on 'Auto' when you encounter stability issues with mem OC's. Method seems to be working well for me with +1200mhz settings and HCH9's

post #1365 of 2062
Well when I initially went for 2133mhz @ 10-10-10-28-1TI had VCCIO and VCCSA on Auto with 1.5 vDimm and 1.48 vcore

I knew that was unstable as my PC restarted a few times overnight (it sits at work in my office).

Today I went for 9-10-10-27-1T @ 1.52 vDimm and VCCIO/SA on Auto. Went up with VCCIO to 1.15 and VCCSA to 1.062x (not all at once, I made a few steps). Multiple workers failed in P95 Blend and multiple errors in Memtest 4.0 but no bluescreens. Bumped vDimm to 1.55 and vCore to 1.48 vcore from 1.45 same results. Loosened timings to 10-10-10-28-1T same results.

As I mentioned before my main objective is max PPD as this is my TC folder. I'm curious if tighter timings and lower latency would be more impacting on PPD than higher frequencies.

I'm also open to going back down to 8gb of memory as for folding I really don't NEED 16gb (I don't think) nor do I use more than 8gb when I use it for work... I mainly stuck 16 in there just because it was cheap and I could.
 
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post #1366 of 2062
Try 10-11-11-28-2T @ 1.55v. The problem you're having is running all slots filled which causes more stress on the memory controller. I'm sure you'll have better results with 2 sticks instead of 4 but if you need all 4 then either loosen some timings or lower your memory overclock.
post #1367 of 2062
Quote:
Originally Posted by SimpleTech View Post

Try 10-11-11-28-2T @ 1.55v. The problem you're having is running all slots filled which causes more stress on the memory controller. I'm sure you'll have better results with 2 sticks instead of 4 but if you need all 4 then either loosen some timings or lower your memory overclock.

Ok so good info here for me. The question that pops into my head is "I dunno, DO I need 16gb?" As I'm not doing any serious Photoshop, rendering, database work etc. I seriously doubt that F@H would benefit from 16gb vs 8.

What I would really like to know is if F@H benefits more from frequency or latency? My gut feeling would be latency but I have no factual evidence for that...
 
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post #1368 of 2062
I was told that you don't need more than 8Gb for F@H. I believe for my TC rig I have it at 2133 9-10-10-28 1T at 1.5V (just set it straight there and it worked, I was happy and didn't feel the need to fix it).
post #1369 of 2062
Quote:
Originally Posted by Samurai707 View Post

I was told that you don't need more than 8Gb for F@H. I believe for my TC rig I have it at 2133 9-10-10-28 1T at 1.5V (just set it straight there and it worked, I was happy and didn't feel the need to fix it).

Yea I don't see how F@H could use more than 8gb of ram. I never see any more than 2 or 2.5gb used on either of the machines I fold on.

I'm also hung up on not wanting to go down to 2T ( guess it's that same part of me that felt let down when I couldn't hit 5.0ghz on my CPU...) I'm going to do some AIDA and superPI benches tomorrow with a few different configurations.

Current Config: 16g @ 1866mhz 9-9-9-24-1T
If I can get it stable enough to bench: 16g @ 2133 10-10-10-28-1T
"" " " : 16g @ 2133 10-11-11-28-2T
"" " " : 8g @ 2133 as tight as possible

My main interest is what sort of latency and bandwidth loss comes from the 1T vs 2T. Again I'm not sure how this would effect folding as I'm not sure exactly how big the chunks of data are and how they are handled...
 
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post #1370 of 2062
Quote:
Originally Posted by DJSticky View Post

Again I'm not sure how this would effect folding as I'm not sure exactly how big the chunks of data are and how they are handled...
Code:
09:48:40:WU00:FS00:News: Welcome to Folding@Home
09:48:40:WU00:FS00:Assigned to work server 129.74.85.15
09:48:40:WU00:FS00:Requesting new work unit for slot 00: RUNNING smp:4 from 129.74.85.15
09:48:40:WU00:FS00:Connecting to 129.74.85.15:8080
09:48:40:WU00:FS00:Downloading 54.78KiB

Edit: That was a small unit...
8056: 12:12:30:WU01:FS00:Downloading 672.25KiB
8004: 13:59:44:WU00:FS00:Downloading 531.64KiB
7610: 06:21:08:WU01:FS00:Downloading 330.59KiB
Edited by Samurai707 - 11/8/12 at 6:41pm
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