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I have a big dilemma

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Last response: in Memory
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December 29, 2010 10:19:31 AM

IM having this big dilemma about my RAM. It's only a 4gb kit ddr2 1066mhz fatality edition from ocz. anyways, my mobo recognizes it as only 800mhz unless i manually set it. my prob is that it only works 1066mhz when it's at dual-channel. I like to set it a space apart because of the weather and temperature here on Guam, where it's mainly sunny and temps around 27-32Celcius. Sometimes reaching 36. My rams natural voltage is 2.0v but just changing the speed is alright. Well my dilemma is whether i should run it at single or dual channels? I read that it's only around 5% increase from single to dual and that dual channel eliminates the bottleneck for the cpu to use memory correctly. Also, is it better to run at 800mhz or 1066mhz? Again, only a slight increase in performance at 1066mhz coming from 800. And running spaced memory at 1066mhz is unstable when i ran prim95. So, whats it gonna be? Single or dual channels? If dual, 800mhz or 1066mhz?

Here are the results i gathered from Everest memory benchmark

Single-Channel: Dual,800mhz Dual,1066mhz,1.8v Dual,1066mhz,2.0v
M. Read=5972 M.Read=6804 M.Read=7523 M.Read=7531
M.Write=5107 M.Write=5100 M.Write=5515 M.Write=5530
M.Copy=5395 M.Copy=7565 M.Copy=8262 M.Copy=8258
M.Latency=63.8 M.Latency=64.1 M.Latency=57.7 M.Latency=57

So what would i choose? Performance or Cooling??

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a b } Memory
December 29, 2010 11:57:58 AM

Ultimately, it is your call. DDR2 1066 RAM is overclocked 800MHz. I would prefer running the RAM in dual channel. If you can add a fan to blow across the RAM, you might be happier running it @1066MHz. If you cannot add a fan, you will not likely notice the difference in 800MHz and 1066MHz, so you keep temps down a little by running the RAM @800MHz in dual channel.
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December 29, 2010 11:26:45 PM

treefrog07 said:
Ultimately, it is your call. DDR2 1066 RAM is overclocked 800MHz. I would prefer running the RAM in dual channel. If you can add a fan to blow across the RAM, you might be happier running it @1066MHz. If you cannot add a fan, you will not likely notice the difference in 800MHz and 1066MHz, so you keep temps down a little by running the RAM @800MHz in dual channel.



well i have im using a coolermaster 690II basic with 6 120mm case fans. So, i have a 120mm right above my rams to exhaust the heat. do you think that's enough?
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a b } Memory
December 29, 2010 11:42:21 PM

Do you need 1066? What settings do you have your CPU at? Only go to 1066 if you're overclocking your CPU that far.
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December 29, 2010 11:44:33 PM

4745454b said:
Do you need 1066? What settings do you have your CPU at? Only go to 1066 if you're overclocking your CPU that far.


I just have a Phenom x4 9850 at default settings. And im not planning on overclocking. Too hot here in guam
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a b } Memory
December 29, 2010 11:53:20 PM

The fact you have an IMC changes things a bit, but you're probably better off with DDR2-800.
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December 30, 2010 3:45:25 AM

4745454b said:
The fact you have an IMC changes things a bit, but you're probably better off with DDR2-800.


sorry if this is a stupid question but, what is an IMC? and is the ddr2-800 dual or single channel?
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a b } Memory
December 30, 2010 2:49:29 PM

IMC = Integrated Memory Controller. RAM is organized like an Excel spread sheet. (columns and rows.) When the CPU needs a bit of info stored in ram it sends the request to the memory controller. In days of old (as recent as 2008 or 2009 I think for Intel...) this request would need to go down to the northbridge through the FSB. (Front Side Bus. The thing that connects the CPU to the motherboard.) The problem is the FSB and NB are slow, so the CPU will spend a lot of cycles sitting there doing nothing.

IMB/AMD were the first (?) to put the memory controller on the CPU die itself. They also stopped using the FSB and went to a high speed direct link, Hyper transport (HT) in AMDs case. Intel caught up with the Core i series. If you and an old P4 or C2D (FSB) based system I would have said don't even bother with 1066 as the gains will be killed by the slow FSB. Because you have an AMD or HT system you can see bigger gains by faster memory. I doubt however that the gains will be worth the increase in heat or system instability.

Short answer if your eyes glazed over all that. You have an AMD system so you will see bigger gains in faster memory then if you had an old P4/C2D Intel system. But chances are the gains you'd see won't be worth the heat/stability problems.
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a c 347 } Memory
December 30, 2010 3:12:38 PM

MOBO: Gigabyte GA-MA785GM-US2H {3 revisions}?? *
Support for DDR2 1200 (OC)/1066(Note2)/800/667 MHz memory modules
(Note 2) Whether 1066 MHz or above memory speed is supported depends on the CPU being used.
CPU: AMD Phenom x4 9850 Black Edition *MOBO/BIOS: Rev 3.3 requires BIOS F8 ; Rev 1.0/F4 ; Rev 1.1/F6
RAM: OCZ Fatal1ty 1066 DDR2 http://www.ocztechnology.com/products/memory/ocz_ddr2_p...
1066 MHz EPP 5-5-5-15*(CAS-TRCD-TRP-TRAS) @ 2.1v

Assuming you set your RAM & CPU OC correctly in the BIOS the you might want to try 'Ganged' in the MIT and if the DCTs Mode -> Ganged.

Q - What revision MOBO and What BIOS version?

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December 31, 2010 2:59:40 AM

jaquith said:
MOBO: Gigabyte GA-MA785GM-US2H {3 revisions}?? *
Support for DDR2 1200 (OC)/1066(Note2)/800/667 MHz memory modules
(Note 2) Whether 1066 MHz or above memory speed is supported depends on the CPU being used.
CPU: AMD Phenom x4 9850 Black Edition *MOBO/BIOS: Rev 3.3 requires BIOS F8 ; Rev 1.0/F4 ; Rev 1.1/F6
RAM: OCZ Fatal1ty 1066 DDR2 http://www.ocztechnology.com/products/memory/ocz_ddr2_p...
1066 MHz EPP 5-5-5-15*(CAS-TRCD-TRP-TRAS) @ 2.1v

Assuming you set your RAM & CPU OC correctly in the BIOS the you might want to try 'Ganged' in the MIT and if the DCTs Mode -> Ganged.

Q - What revision MOBO and What BIOS version?


My mobo is the 1.1 edition and BIOS F7. My ram is 1066 mhz EPP 6-7-7-20 CRT2 @2.0v. You looked at the wrong ram. Mine isn't EOL yet. My ram and cpu right now is at default settings. So, my ram is set at 5-5-5-15 @1.8v 800mhz. Thank you guys for helpin me out. Even though it isn't solved yet. I still thank you guys.
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a c 347 } Memory
December 31, 2010 3:48:10 AM

I hate guessing, then I assume this is yours -> http://www.ocztechnology.com/products/memory/ocz_ddr2_p... 1066 CL 6-7-7-20(CAS-TRCD-TRP-TRAS) @ 2.0v

MOBO GA-MA785GM-US2H {1.1} http://www.gigabyte.us/products/product-page.aspx?pid=3... - yep you're due for a BIOS update. You may need to F9 before getting to F12A.

Verify proper slots:


Memory Clock -> 5.33 {assumes you have AM3/AM2+ CPU}?1
DCTs Mode -> Ganged {assumes your CPU will allow it}??2
DRAM Configuration {enter}
-> 6-7-7-20
DDR2 Voltage Control -> +0.1~+0.2v
*NorthBridge Volt Control -> +0.1v {increase if failure}

?1 if your CPU is NOT a AM3/AM2+ then yes you're stuck at 800 MHz
??2 often this helps.

Q - What CPU?



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December 31, 2010 12:46:10 PM

jaquith said:
I hate guessing, then I assume this is yours -> http://www.ocztechnology.com/products/memory/ocz_ddr2_p... 1066 CL 6-7-7-20(CAS-TRCD-TRP-TRAS) @ 2.0v

MOBO GA-MA785GM-US2H {1.1} http://www.gigabyte.us/products/product-page.aspx?pid=3... - yep you're due for a BIOS update. You may need to F9 before getting to F12A.

Verify proper slots:
http://i1013.photobucket.com/albums/af254/Jaquith/DDR_DUAL.jpg

Memory Clock -> 5.33 {assumes you have AM3/AM2+ CPU}?1
DCTs Mode -> Ganged {assumes your CPU will allow it}??2
DRAM Configuration {enter}
-> 6-7-7-20
DDR2 Voltage Control -> +0.1~+0.2v
*NorthBridge Volt Control -> +0.1v {increase if failure}

?1 if your CPU is NOT a AM3/AM2+ then yes you're stuck at 800 MHz
??2 often this helps.

Q - What CPU?


I think you didn't really read my post thoroughly. I'm just asking if i should go with performance at 1066 or 800 mhz dual-channel with both sticks together generating a lot of heat or cooling. Separated ram sticks running at 800mhz single channel. I know your trying to help but i already know where and how to put my ram sticks. I'm just asking on your opinion. BTW, you already know my cpu. You posted it yourself.
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a c 347 } Memory
December 31, 2010 1:10:54 PM

reyshan said:
So what would i choose? Performance or Cooling??

Performance - but set everything correctly!

I have blinders on one post to another; CPU: AMD Phenom x4 9850 Black Edition. I didn't see it.

I cannot imaging much of a difference as the speed goes up {faster} so does the CAS go up {slower}. 800 v 1066 might be a 1~2% differences IF you adjust CAS.

In your case you probably did NOT adjust your CAS lower at 800 MHz; look at CPUz and read ALL of the JEDEC speeds and CAS and set appropriately. You ONLY get an ~8% difference with incorrect settings...

See the JEDEC CAS differences:
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a c 347 } Memory
December 31, 2010 1:16:02 PM

BTW - IF you want to really dial-in RAM then 'try' to lower the CAS below spec and at rated speed. Example: 1066 6-7-7-20 -> 5-6-6-18
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December 31, 2010 1:23:50 PM

jaquith said:
BTW - IF you want to really dial-in RAM then 'try' to lower the CAS below spec and at rated speed. Example: 1066 6-7-7-20 -> 5-6-6-18


why drop it down? wouldn't it be ustable? and should i pick 800mhz or just the 1066mhz? i know 1066 generates more heat and it's hot here in guam. BTW, my ram at 800 reading at cpuz is: 5-5-5-15 24 2t(CAS-TRCD-TRP-TRAS-TRC) @1.8v Isn't it good enough at that level? I'm not an overclocker because of the heat it generates here.
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a c 347 } Memory
December 31, 2010 1:47:24 PM

You need to 'test' with e.g. Memtest and Prime95, I OC RAM, CPUs, GPUs all day long - none if it is stock. Some OC better {BIN Sort} issues. Heck I might even try faster than 1066 Rated Speed, and I defiantly would try lowering the CAS.

I am a 'good' OC'er and I watch my temps. In your case, unless you're running 4X4GB or 'whatever' the max is I wouldn't be overly concerned about RAM temps. I too, if you read my posts, am very conservative about Voltage; Voltage = Heat.

Try it the worst is a Post Failure or BSOD -> just boot into the BIOS and change...
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December 31, 2010 2:17:20 PM

jaquith said:
You need to 'test' with e.g. Memtest and Prime95, I OC RAM, CPUs, GPUs all day long - none if it is stock. Some OC better {BIN Sort} issues. Heck I might even try faster than 1066 Rated Speed, and I defiantly would try lowering the CAS.

I am a 'good' OC'er and I watch my temps. In your case, unless you're running 4X4GB or 'whatever' the max is I wouldn't be overly concerned about RAM temps. I too, if you read my posts, am very conservative about Voltage; Voltage = Heat.

Try it the worst is a Post Failure or BSOD -> just boot into the BIOS and change...


I just tried the settings at 5-6-6-18 at 1066mhz @ 2.0v and ran prime95 and it's stable. But there is barely any difference in speed when i checked with everest. Not much difference or barely any difference. I'm just gonna keep it at 10066mhz stock clocks at 1.8v NO difference in anything. Nothing at all. Thanks anyways. You've been a great help. All of you guys. Thanks.
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January 1, 2011 1:55:04 AM

jaquith said:
Try Super Pi -> http://virgilioborges.com.br/hyperpi/


ok, i ran super pi it looks like another prim95. Anyways it's all stable. I don't know why you are telling me to try it. i did though
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a c 347 } Memory
January 1, 2011 1:23:47 PM

Because it's the best free test to show performance gains in RAM.

YES, I can read that you prefer a conservative approach which I get. But I too see your flooding of test data which to me seems wishy-washy to your last couple of statements... Running your RAM at it's rated speed is normal, and doesn't justify your concerns.

4X4GB with full density is hot, 2X2GB or even 4X2GB isn't.

I run 1600 at 1800 MHz with zip issues, and 'real' OC of RAM is easily feasible if you understand what BIN & Specs truly are in relation to 'rated speed.' {I watch Temps, Stability, and use the lowest Voltages to achieve the coolest - longterm life}.

Similarly OC your CPU, especially when you know the Lithography of a CPU; SAME CPU different IMPRINTED CPU Multipliers with everything else the SAME, one is ($200) 2.6GHz and the other ($300) 3.3GHz same Lithography line + unsuspecting consumers.
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January 18, 2011 9:09:40 AM

jaquith said:
Because it's the best free test to show performance gains in RAM.

YES, I can read that you prefer a conservative approach which I get. But I too see your flooding of test data which to me seems wishy-washy to your last couple of statements... Running your RAM at it's rated speed is normal, and doesn't justify your concerns.

4X4GB with full density is hot, 2X2GB or even 4X2GB isn't.

I run 1600 at 1800 MHz with zip issues, and 'real' OC of RAM is easily feasible if you understand what BIN & Specs truly are in relation to 'rated speed.' {I watch Temps, Stability, and use the lowest Voltages to achieve the coolest - longterm life}.

Similarly OC your CPU, especially when you know the Lithography of a CPU; SAME CPU different IMPRINTED CPU Multipliers with everything else the SAME, one is ($200) 2.6GHz and the other ($300) 3.3GHz same Lithography line + unsuspecting consumers.


hey, sorry if i haven't replied in a long time. i had two surgeries and was off-island so i couldn't touch my pc. I was wondering if i could just clock it at 800mhz because my ram is only stable when i run it at 1066mhz on 2.0v. which is somewhat hot and the lifespan will be shorten. at 800mhz, what is the "sweet spot" to clock the CAS down?
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January 29, 2011 1:14:08 AM

Best answer selected by reyshan.
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