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1066Mhz dual channel vs 1600mhz single channel

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April 4, 2011 5:26:35 PM

Hello,

I have upgraded my pc to ddr3 and now it looks like this:

ASUS P5P43TD
Intel Core 2 Quad Q6700
Corsair Venegeance 2x4GB 1600 cl9
WD Caviar Black 1tB
Ati 5770 1gb
---------------
now the problem is that this mainboard only supports 1600mhz ddr3 in SINGLE CHANNEL MODE
and it should support 1333 (but it isn't listed in bios :D 

now I have to choose from setting my memory to: 1066mhz DUAL CHANNEL or 1600mhz SINGLE CHANNEL

which is better?

thx
a b } Memory
April 4, 2011 5:49:36 PM

The greater speed of setting the RAM to 1600 will more than make up for the channel difference. 1600 all the way.
a c 163 } Memory
April 4, 2011 6:09:23 PM

What model do you have? What specs?

Related resources
April 4, 2011 7:03:07 PM

Corsair venegence 8gb (2x4gb kit) 1600mhz 9-9-9-24
(cmz8hx3m2a1600c9)
a c 347 } Memory
April 4, 2011 7:12:49 PM

Assuming this MOBO - P5P43TD http://usa.asus.com/product.aspx?P_ID=6zU8BbYgHOzUfmR6

1600(O.C)/1333/1066/800 MHz
Memory 4 x240-pin DIMM, Max. 16 GB, DDR3 1600(O.C.)/1333/1066/800 Non-ECC,Un-buffered Memory
Dual Channel memory architecture
* Supports one DIMM per channel only when overclocking to 1600MHz.

So assuming 4-DIMM Slots then a 2x4GB complies as 1600 MHz, now if you had 4X4GB then you couldn't use 1600 MHZ,but you could use 1333 MHz instead.

Properly setting-up 1333 LOWER CAS vs 1600 HIGHER CAS with the same sticks is negligible ~1%.
a c 163 } Memory
April 4, 2011 7:22:40 PM

According to the QVL of that mobo, 1600MHz is possible with overclock and in dual channel configuration.

1600MHz for your case will not be overclock since the RAM is rated for that speed, you can try and see if that works.
April 4, 2011 7:29:41 PM

I dont think that memory kit will work..
a c 347 } Memory
April 4, 2011 7:54:35 PM

saint19 said:
1600MHz for your case will not be overclock since the RAM is rated for that speed, you can try and see if that works.

Huh?! It's Corsair venegence 8gb (2x4gb kit) 1600mhz 9-9-9-24 (cmz8hx3m2a1600c9); obviously the Part Number is wrong, but contained in the P/N is 1600c9 or 1600 MHz CAS 9.

Also, to my knowledge all Vengeance are XMP; so simply set AI Overclock Tuner -> XMP ; failure AI Overclock Tuner -> Manual and DRAM Frequency -> DDR3-1600 MHz, and set the CAS Timings per Corsair's spec ==> DRAM Timing Control to manual. Most 1600 MHz Vengeance are 9-9-9-24-{not available is 2N Command Rate}.
a c 163 } Memory
April 4, 2011 8:01:21 PM

jaquith said:
Huh?! It's Corsair venegence 8gb (2x4gb kit) 1600mhz 9-9-9-24 (cmz8hx3m2a1600c9); obviously the Part Number is wrong, but contained in the P/N is 1600c9 or 1600 MHz CAS 9.
said:


Also, to my knowledge all Vengeance are XMP; so simply set AI Overclock Tuner -> XMP ; failure AI Overclock Tuner -> Manual and DRAM Frequency -> DDR3-1600 MHz, and set the CAS Timings per Corsair's spec ==> DRAM Timing Control to manual. Most 1600 MHz Vengeance are 9-9-9-24-{not available is 2N Command Rate}.


That's what I say, those kits are 1600 CL9, he don't need overclock just go to the BIOS and select the proper configuration, if it¡s not stable play with the settings until you do it stable.

Those Corsair Vengeance kits comes in 1600 CL9 and 1333 CL8.
April 4, 2011 8:14:29 PM

i set it to manual: choose 1600 and timings to 9-9-9-24 (and it doesn't boot), after try 3 it gives me:
overclocking failed: 1. enter bios 2. use defaults

I don't know why I don't have 1333 option only 800,1066,1600,1866?

and what is faster 1066 DUAL CHANNEL or 1600 SINGLE?

thx everyone
a c 347 } Memory
April 4, 2011 8:20:08 PM

uollaa said:
i set it to manual: choose 1600 and timings to 9-9-9-24 (and it doesn't boot), after try 3 it gives me:
overclocking failed: 1. enter bios 2. use defaults

I don't know why I don't have 1333 option only 800,1066,1600,1866?

and what is faster 1066 DUAL CHANNEL or 1600 SINGLE?

thx everyone


Q - What DIMM Slots are you using?
Q - Are you only installing the 2 sticks?

Q - What is the AI OC Tuner set to?

ANS - '1066 DUAL CHANNEL or 1600 SINGLE' I'd have to test with Super PI.
a c 163 } Memory
April 4, 2011 8:20:19 PM

uollaa said:
i set it to manual: choose 1600 and timings to 9-9-9-24 (and it doesn't boot), after try 3 it gives me:
overclocking failed: 1. enter bios 2. use defaults

I don't know why I don't have 1333 option only 800,1066,1600,1866?

and what is faster 1066 DUAL CHANNEL or 1600 SINGLE?

thx everyone


AFAIK 1600MHz single channel doesn't exist.
a c 347 } Memory
April 4, 2011 8:28:33 PM

Try:
AI Overclock Tuner -> XMP
DRAM Frequency -> DDR3-1600 MHz
Extreme Memory Profile -> Enabled
*failure*FSB Strap to Northbridge -> 400 MHz ; this increases the the FSB to 1600 MHz.
April 4, 2011 8:30:11 PM

to jaquith:

I have 2 sticks of 4 GB (8GB total), and mobo has 2 slots (2blacks 2 reds)..

I tried all combinations Black + red, r r, b b, r + b.... all of them :)  and I tried setting 1600mhz manually and by XMP profile, and It doesn't work in any combination nor in Single Channel nor in Dual Channel.

At 1066 MHz it works like a charm..


ok, now why is my mobo's bios missing 1333Mhz Frequency. I inserted the native 1333mhz memory, and it also works on 1066, I have no 1333 option :( 


thx
April 4, 2011 8:31:55 PM

Edit: the mobo has 4 slots :) 
a c 163 } Memory
April 4, 2011 8:33:37 PM

Can you post a picture of your BIOS and the options on it?
April 4, 2011 8:34:35 PM

saint19 said:
Can you post a picture of your BIOS and the options on it?



wait 5 mins, I have to restart :) 
April 4, 2011 8:45:13 PM





a c 163 } Memory
April 4, 2011 8:59:35 PM

1- Disable PCI-E and CPU spread spectrum.
2- Set Ai Overclock tuner to "manual"
3- In DRAM Frequency select "*DDR3-1600MHz*"
4- In DRAM Timing configuration, set the defaults timings for your RAM (9-9-9-24)
5- Set the DRAM Voltage to 1.5V

Save change, reboot and let me know the results.
April 4, 2011 9:14:13 PM

saint19 said:
1- Disable PCI-E and CPU spread spectrum.
2- Set Ai Overclock tuner to "manual"
3- In DRAM Frequency select "*DDR3-1600MHz*"
4- In DRAM Timing configuration, set the defaults timings for your RAM (9-9-9-24)
5- Set the DRAM Voltage to 1.5V

Save change, reboot and let me know the results.



NO GO :( 

when I chagne AI OVERCLOCK TUNER to manual (or XMP) than DRAM Frequency is maximum listed 1066..


thx for trying :) 
a c 163 } Memory
April 4, 2011 10:01:42 PM

uollaa said:
NO GO :( 

when I chagne AI OVERCLOCK TUNER to manual (or XMP) than DRAM Frequency is maximum listed 1066..


thx for trying :) 


Let me arrive home to help you more.
a b } Memory
April 5, 2011 3:56:34 PM

uollaa said:
NO GO :( 

when I chagne AI OVERCLOCK TUNER to manual (or XMP) than DRAM Frequency is maximum listed 1066..


thx for trying :) 


The XMP setting has cause me no end of issues over the years. Om enthusiast builds, I have found that using Manual instead of XMP allows me to set the DDR speed manually. However on the "office" 1156 based builds I have done, I have found the following:

a) Choosing XMP puts the RAM at 1600 but it does it by changing the BCLK to 160
b) Choosing manual, gives me choices of 1066 or 1333.

I concluded that the allowable memory multipliers are only 8 and 10 and therefore the only way the Ai Overclocker thingie can do 1600 is to up the BCLK.
!