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post #21 of 30
xd 1771.
Here's another question for you.
Could you possibly tell me what would be the correct way to reealx timings for dd3 chips??
U really do NOT know what to increase first.
And any simple formula??

Sorry, I may not be doing my somework here but any help is greatly appreciated!
post #22 of 30
Trust me, you're not really running dual channel. It's something that happens when you mix DIMMs but may have one channel working at dual, called interleaving. In MaxxMem this doesn't really make a difference, but in boot times, snappiness, app load times, etc. this is where it can be a big difference.

To lower [better word than relax] timings, take it one at a time of course, but it also helps to know the ICs. Certain ICs behave differently. Of course this is a bit risky now since you're actually mixing memory. Normally you should focus on lowering the tRCD [middle value in, say, 6-8-6] first (on many ICs such as the notorious PSC this is the tough one to get down), followed by the CAS latency and tRP (first and latter value). Then you focus on lowering the tRAS and tRC [the two bigger numbers at the end of 6-8-6-20-24]. As for the command rate, you can either choose to keep it at 2T and set to 1T when you're finished, or go straight to 1T. This can make some difference, but can also lead to instability at 1T.
post #23 of 30
Thanks maite!! A bit drunk righht now so will post again 2moro !! till then !

Cheers :cheers
post #24 of 30
Quote:
Originally Posted by xd_1771 View Post
Trust me, you're not really running dual channel. It's something that happens when you mix DIMMs but may have one channel working at dual, called interleaving. In MaxxMem this doesn't really make a difference, but in boot times, snappiness, app load times, etc. this is where it can be a big difference.

To lower [better word than relax] timings, take it one at a time of course, but it also helps to know the ICs. Certain ICs behave differently. Of course this is a bit risky now since you're actually mixing memory. Normally you should focus on lowering the tRCD [middle value in, say, 6-8-6] first (on many ICs such as the notorious PSC this is the tough one to get down), followed by the CAS latency and tRP (first and latter value). Then you focus on lowering the tRAS and tRC [the two bigger numbers at the end of 6-8-6-20-24]. As for the command rate, you can either choose to keep it at 2T and set to 1T when you're finished, or go straight to 1T. This can make some difference, but can also lead to instability at 1T.
Thanks for the info, am + repping you at the end of this post. Most thankful!!

My ram is a set of :
2x2GB G.SKill Value ram 1333 9-9-9-24 1.5V 1T --- running this in channel A
1x4GB Corsair XMS3 1600 9-9-9-25 1.65V 2T---- This in channel B

So far this is what I've done :/
1. Ram was failing @ 1600 MHz @ 10-10-10-28 1.6V after around 10 hours of memtest 4 instances 1800MB ram each ( out of a total of 8, that commits 7.2)
2. Dropped down to 1333MHz @ 9-9-9-25 2T -- due the stupid corsair- and my BIOS doesn't have a 1/2T option- I can set this in windows, but I'd rather go for timings over 1T /2T cause I heard that 2T only messes with the first read .. Ran 15 HRS p64 (prime 95) @ blend stable
3a.7-8-8-24 --- NOT STABLE @ 1.62V -- ran into an error some many hours into memtest.
3b.Now tightening.. Increased volts to 1.65V
so far RAM Speed : 666.7 MHz (3:10) @ 7-9-8-24 2T and tightening..
Stable so far about 1000-1100% in 4 memtest threads . Should I run more before I proceed OC'ing or just OC ??

Where do I go from here? I do know that my value ram is holding me back . But I've installed some fab AC RC pro heatsinks
Should I stick to tightening these values-- I've so far only touched upon :
CAS (-2)
RCD (same)
RP (-1)
RAS (-1)

I'm over volting my eco ram by 1.5V which frankly I'm not bothered about!


GPU z gives me this as my ram setup
RAM : 8192 MB DDR3 Dual Channel
Slot 1 : 4096MB (8500) <---- this doesn't even make sense :/
Slot 1 Manufacturer : Corsair
Slot 2 : 2048MB (10700)
Slot 2 Manufacturer : G.Skill
Slot 3 : 2048MB (10700)
Slot 3 Manufacturer : G.Skill

Have underclocked my CPU cause I have the radiator on and my room is nice and HOT Also don't want my proccy running over 50C

I should add that setting it to 1 T in windows WHILE memtest was running got me an instant black screen reboot :/
post #25 of 30
1. You should never be running 1600Mhz above CL9
2. Unmixed RAM may hold back OCs on everything else.
3. I would've waited and saved, and gotten better RAM (i.e. 4x2GB, 2x4GB) instead of those heatsinks (which are pretty useless anyway unless you push around 1.8V or so). Why this is is because:
4. You're still not getting proper dual channel performance and whatever overclocks you do on the RAM timings while on an interleaved/single channel system are probably not making enough of a difference at all in performance.
5. Your RAM is not ECO RAM, and even then overvolting "ECO" RAM (not just G.Skill ECOs either) is not necessarily unsafe. It depends on the ICs.
6. The Corsair DIMM is rated PC3-8500 in the SPD (programmed non-performance setting defaults for most systems to use esp. those that can't set RAM speed or timings) and not on paper/tested, as such appearing as 8500 there vs. 10700 isn't really an issue.
Edited by xd_1771 - 1/20/11 at 5:52pm
post #26 of 30
1. You should never be running 1600Mhz above CL9
U tried cl9 -- fail :/ foes to cl11 auto btw.. cl10 ( 1st time huh?) gave me an error after 4-5 hours of memtest86+

2. Unmixed RAM may hold back OCs on everything else.
You do mean Mixed?? I;ve been up way longer than my bedtime (8AM here) and I may be misunderstanding!!

3. I would've waited and saved, and gotten better RAM (i.e. 4x2GB, 2x4GB) instead of those heatsinks (which are pretty useless anyway unless you push around 1.8V or so). Why this is is because:

Was on a sad budget when things happened.. any who would want to buy 1333 cl 9 sticks ? So I'm stuck with them .. for the time being.

4. You're still not getting proper dual channel performance and whatever overclocks you do on the RAM timings while on an interleaved/single channel system are probably not making enough of a difference at all in performance.
So are my 2x2 running in dual ?? That would mean that adding the 1x4gb corsair is not fudging my performance, and even if it did a bit, 8GB >4GB ?
I don't wanna go back to 4 :/ Running a 550 MB Ramdrive for opera and love every bit of it

5. Your RAM is not ECO RAM, and even then overvolting "ECO" RAM (not just G.Skill ECOs either) is not necessarily unsafe. It depends on the ICs.

Not ECO , its value ram :/ even worse huh? My ICs are NOt documented anywhere.. and was stupid enough not to make a note of them. Won't remove my heatsinks now. I have no idea how to get thermal tape ( good stuff) in India :/
Frankly, I'd rather burn my dimms (volt wise) than not push them Lifetime warranty FTW -- I'm hoping Gskill won't have a replacement and'll gimme better ram cheapo tactics , but I'm sure it'll never come to that!

6. The Corsair DIMM is rated PC3-8500 in the SPD (programmed non-performance setting defaults for most systems to use esp. those that can't set RAM speed or timings) and not on paper/tested, as such appearing as 8500 there vs. 10700 isn't really an issue.
I was just curious Stupid SPDs .. Why couldn't they simply implement BEMPs and AOD would look so much more appealing- the latest version 3.2.3 is messing up everything - can't even read volts properly any more. Scared :/ I'd rather use CPU tweaker to mod my timings and all

What timings do I target now ?
I feel 1333 is the right frequency to target anyway !
post #27 of 30
2. Yes, I meant mixed actually.
3. If the RAM drive helps, stick with 8GB. You may see a performance increase if you replace your memory so really do consider it.
5. Eh, SPDs are for systems that can't set RAM speed and timings such as servers & prebuilts. It's more of a plug-and-play thing. Often there are SPD extensions such as EPP and XMP that contain the performance settings (which you can use on certain AMD chipsets i.e. 800 series) but that's really it.
7. As low as you possibly can manage 1333 is an okay frequency to target, though I normally recommend 1600 due to performance-speed scaling and IC scaling for the most part.
post #28 of 30
hey man go with some G skill Ripjaws 8 gigs. 1333 is the speed. Its dual channel and has a heat spreader. Good RAM (bought it myself)

http://www.newegg.com/Product/Produc...82E16820231311
TEHCAKEISALIE
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 @3.55 Ghz GIGABYTE GA-880GA-UD3H AM3 AMD 880G HDMI SATA 6Gb/ 9600 GT 512mb 8 Gigabytes Ripjaws 
Hard DriveOptical DriveOSMonitor
1 Terabyte 7200 RPM WD Asus DVD/CD x52 Windows 7 Ultimate 64-bit 21.5 Full HD 
PowerCase
500 Watt OCZ Antec 300 Illusion 
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TEHCAKEISALIE
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x4 @3.55 Ghz GIGABYTE GA-880GA-UD3H AM3 AMD 880G HDMI SATA 6Gb/ 9600 GT 512mb 8 Gigabytes Ripjaws 
Hard DriveOptical DriveOSMonitor
1 Terabyte 7200 RPM WD Asus DVD/CD x52 Windows 7 Ultimate 64-bit 21.5 Full HD 
PowerCase
500 Watt OCZ Antec 300 Illusion 
  hide details  
Reply
post #29 of 30
Quote:
Originally Posted by xd_1771 View Post
2. Yes, I meant mixed actually.
3. If the RAM drive helps, stick with 8GB. You may see a performance increase if you replace your memory so really do consider it.
5. Eh, SPDs are for systems that can't set RAM speed and timings such as servers & prebuilts. It's more of a plug-and-play thing. Often there are SPD extensions such as EPP and XMP that contain the performance settings (which you can use on certain AMD chipsets i.e. 800 series) but that's really it.
7. As low as you possibly can manage 1333 is an okay frequency to target, though I normally recommend 1600 due to performance-speed scaling and IC scaling for the most part.
3. Removing my 4Gb results in no bandwidth change acc. to tests-- but for all you know those apps are running on the dual channel lane :_) no way to tell!
5. Got it ! Now why do I have a 785 G :@
7. 1333 is stock. And lower than 1600 -- but that should be offset by running tighter timings ?? I thought tighter timings > higher freqs. specially w/ >2 sticks on an AMD platform ??


A. Sorry I keep asking , but what timings should I target now ?

B. Also ,in my BIOS, options to set timings are : DCT0, DCT1 and BOTH
I choose both and some dupes appear like tCL and TCL ... I'm guessing t is for one channel and T for the other ??
But I honestly though that all ram must run at ONE spec in the same system??
post #30 of 30
Quote:
Originally Posted by andycludge View Post
hey man go with some G skill Ripjaws 8 gigs. 1333 is the speed. Its dual channel and has a heat spreader. Good RAM (bought it myself)

http://www.newegg.com/Product/Produc...82E16820231311
Nice, now time to 1.65V and 1600 MHz them already Remember to lock in the timings into the BIOS lest they skip all over the place!

My value ram from gskill is doing well, and going strong. Ripjaws must pawn

BTW , lOl sig
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