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Changing RAM timing

post #1 of 6
Thread Starter 
I am trying to change my RAM timings to try and stabilize my OC, I realized that my bottle neck is my RAM after some testing and tweaking.

I understand how to change the CAS Latency — RAS to CAS Delay/TRCD — RAS Precharge/TRP — TRAS, however in my BIOS I see an option called TRD 1 or TRD 0, or Both.

I can set the timings for both the TRD 0 and 1 or just 0 or just 1 ???
I also noticed somethign called "ganged or unganged", enabled or disabled ???
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post #2 of 6
This will explain ganged vs unganged for you:

http://www.overclock.net/amd-memory/324052-ganged-vs-unganged-mode.html
Quote:
Originally Posted by danewfie;3768700 
It is amd's version of Nvidia's Locked vs unlocked architecture.

basically allowing you to use your ram in dual channel vs single channel.

Ganged = dual channel mode for ram. All cores get access to 100% of the ram.

unganged = single channel. Each core gets access to a stick of ram.

In theory, the unganged mode is better as each core will get access to data quicker. In theory.

Some limitations apply... and i don't know much else.

Edit: sorry, it also allows you to control the clocks independently from each other.

Read this in another aricle:
-Performance Level / Read Delay (tRD)-
tRD is the number of memory clocks from DRAM Chip Select# assert
to Host Data Ready# assertion on the FSB.
High influence on performance and stability.

The lower the number the tighter the timing from what it seems. I would set it to AUTO(if possible) or 1 and then test with memtest to see if its stable first then run a Prim95 test to ensure full stability in OS.
Edited by Rick Arter - 5/14/11 at 8:51am
    
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post #3 of 6
Thread Starter 
Thanks for the reply, no one seems to be on the forum on the weekends lol +1rep for not having a life like me lol rolleyes.gif

I guess the thread basicaly explains that unganged and ganged is dual or single chanel memory, OR that you can assign 1 single memory stick per CPU core. I still don't know however witch one is better, I guess I'll run a bench mark and see which one score higher.

I almost feel like I openned up a big can of warms with my OC.

So far I'm at 3.9Ghz CPU, and 2800Mhz NB, and I'm realizing that my bottle neck is my memory. To bad I didn't spend an extra 100$ to get up to 4.2 or 4.2Ghz frown.gif
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My AMD/ATI build
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AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
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OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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post #4 of 6
Quote:
Originally Posted by thestef;13502629 
Thanks for the reply, no one seems to be on the forum on the weekends lol +1rep for not having a life like me lol rolleyes.gif

I guess the thread basicaly explains that unganged and ganged is dual or single chanel memory, OR that you can assign 1 single memory stick per CPU core. I still don't know however witch one is better, I guess I'll run a bench mark and see which one score higher.

I almost feel like I openned up a big can of warms with my OC.

So far I'm at 3.9Ghz CPU, and 2800Mhz NB, and I'm realizing that my bottle neck is my memory. To bad I didn't spend an extra 100$ to get up to 4.2 or 4.2Ghz frown.gif
NP glad to help today's my day off and I am a troller of the unanswered thread section when I am on OCN. typer.gif

From what I hear on AMD rigs is upping NB to around 3000mhz if possible will get you some performance gain. Not possible on all systems and overclocks iirc but worth a shot if you have time. Really wish I could have helped more on the other Q but didn't find much info besides what I posted. Not a big AMD guy but soon might be depending on how Bulldozer looks and the cost.
    
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post #5 of 6
Thread Starter 
Thanks for the help,

I'm already at 2800Mhz NB, I tried 3000Mhz (even with higher Volts) and its a no go, system won't even post.... it actualy scared the heck out of me since I had to remove\re-install the CMOS battery for the system to boot back up. eek.gif

Its weird how 2800Mhz is surprizingly stable, I can't even get past 3.8Ghz with my CPU OC because of my RAM limitation.

Oh well, 3.8Ghz with a NB of 2800Mhz and a 940Mhz GPU OC will have to do.
At least I know my setup is 100% stable.

Once again, thanks for the help... if I have time I'll run some bench marks with the ganged and unganged setting and I will post my results.
Edited by thestef - 5/14/11 at 5:04pm
My AMD/ATI build
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CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
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Reply
post #6 of 6
Thread Starter 
Well, looks like unganged mode is a tiny bit better then ganged mode, but it was only 40 points lower with ganged mode in 3DMark Vantage (score of 19999 compared to 19959)
My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
  hide details  
Reply
My AMD/ATI build
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8350 (4..60Ghz) Gigabyte 990FXA-UD5 XFX R9-290 G.SKILL 8GB DDR3-1600Mhz 7-8-7-24 
Hard DriveOSMonitorPower
OCZ Vertex 2 Windows 7 Home 42 Inch Panasonic 1080p Plasma Antec Truepower 750W 
  hide details  
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