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1.65v Overclock Question

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  • Memory
  • Overclocking
Last response: in Overclocking
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Anonymous
a b } Memory
a b K Overclocking
March 14, 2010 6:54:10 PM

I'm a little confused with this whole 1.65v limit on memory overclocking.

My mobo (P6T v2) had a sticker stating NEVER to go over 1.65v on my memory. I ordered this memory:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I'd like to OC it to PC3 16000, (it defaults to 1066, but is advertised at 16000), but in order to do this, wouldn't I have to go above 1.65v? Any way to get around this?

More about : 65v overclock question

a b K Overclocking
March 14, 2010 8:16:38 PM

Your ram is rated at DDR3-2000 @ 1.65v

Setting it at it's rated frequency and voltage is NOT overclocking it, don't see what the problem is.

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a b } Memory
a c 126 K Overclocking
March 14, 2010 8:20:36 PM

No if your memory is rated at 2000mhz with 1.65V then it will do just that.

You just have to set your memory speed, latency timings and voltage to whats advertised.

When I installed my OCZ RAM rated at 1333mhz 7-7-7-21 @ 1.65V my BIOS put the speed to 1066mhz 7-7-7-21 @ 1.5V

Your motherboard has likely done something very similar. You just have to manualy change the memory settings and your done.
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a b } Memory
a b K Overclocking
March 14, 2010 9:02:18 PM

Quote:
I'm a little confused with this whole 1.65v limit on memory overclocking.

My mobo (P6T v2) had a sticker stating NEVER to go over 1.65v on my memory. I ordered this memory:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I'd like to OC it to PC3 16000, (it defaults to 1066, but is advertised at 16000), but in order to do this, wouldn't I have to go above 1.65v? Any way to get around this?


In order to reach DDR3-2000 (PC3-16000) you'll probably need to raise the Uncore (memory controller) voltage to around 1.35V. But, you CANNOT run 2000MHz without overclocking other stuff since it's not a "proper" ratio.

The proper ratios for your CPU will get you to DDR3-1866 or DDR3-2133 but not half-way in-the-middle. One of those two settings is probably available as an XMP ratio that you can enable in BIOS.

Now about your board: It has a habit of choosing overly-agressive voltage levels with SOME RAM. You can chose and XMP ratio and, after rebooting, lower the voltage levels to an appropriate setting.

Or, if you REALLY WANT it to run at DDR3-2000, be prepared to overclock the CPU Base Clock.

As for me, I overclock everything anyway...I'd have the base clock at 200 MHz already, which would also allow a DDR3-2000 memory data rate.
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a b } Memory
a c 167 K Overclocking
March 14, 2010 9:15:41 PM

Most people don't get faster RAM to OC Memory, they are thinking OC'ing the system. You didn't list a CPU so I will use the i7-920 as an example, here are the stock settings:

BCLK 133 x 20 CPU Multiplier = 2.66 GHz CPU
BCLK 133 x 8 Mem Multiplier = 1066 MHz CPU

IIRC, the available mem multipliers on that BIOS are 6. 8, 10, 12 & 14 ... so, you could:

BCLK 133 x 20 CPU Multiplier = 2.66 GHz CPU
BCLK 133 x 10 Mem Multiplier = 1333 MHz CPU

BCLK 133 x 20 CPU Multiplier = 2.66 GHz CPU
BCLK 133 x 12 Mem Multiplier = 1600 MHz CPU

BCLK 133 x 20 CPU Multiplier = 2.66 GHz CPU
BCLK 133 x 14 Mem Multiplier = 1866 MHz CPU

or you could overclock the entire system

BCLK 167 x 20 CPU Multiplier = 3.33 GHz CPU
BCLK 167 x 8 Mem Multiplier = 1333 MHz CPU

BCLK 167 x 20 CPU Multiplier = 3.33 GHz CPU
BCLK 167 x 10 Mem Multiplier = 1667 MHz CPU

BCLK 167 x 20 CPU Multiplier = 3.33 GHz CPU
BCLK 167 x 12 Mem Multiplier = 2000 MHz CPU

BCLK 200 x 20 CPU Multiplier = 4.00 GHz CPU
BCLK 200 x 8 Mem Multiplier = 1600MHz CPU

BCLK 200 x 20 CPU Multiplier = 4.00 GHz CPU
BCLK 200 x 10 Mem Multiplier = 2000 MHz CPU







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a b } Memory
a b K Overclocking
March 14, 2010 10:15:12 PM

JackNaylorPE said:
Most people don't get faster RAM to OC Memory, they are thinking OC'ing the system. You didn't list a CPU so I will use the i7-920 as an example, here are the stock settings:

BCLK 133 x 20 CPU Multiplier = 2.66 GHz CPU
BCLK 133 x 8 Mem Multiplier = 1066 MHz CPU

IIRC, the available mem multipliers on that BIOS are 6. 8, 10, 12 & 14 ... so, you could:



They're actually 3, 4, 5, 6, 7, and for some boards 8...and for a few board, 9. Yes, some boards allow you to set DDR3-2400. BCLK 133 x 4 for DRAM = 533 MHz, which is DDR(x)-1066.

I'm pretty sure his BIOS has the 8x memory multiplier, and I'm pretty sure his RAM is stable at DDR3-2133 so the big question there is...whether or not the rest of the system can handle it. There are things such as the design of the memory traces and voltage regulators that make different boards have different stable limits, which is why Tom's Hardware gets a wide range of results from similar motherboards when using the same CPU and RAM.
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a b K Overclocking
March 14, 2010 11:53:42 PM

Crashman said:
I'm pretty sure his BIOS has the 8x memory multiplier, and I'm pretty sure his RAM is stable at DDR3-2133 so the big question there is...whether or not the rest of the system can handle it.


Crash that's pretty good without any info back from the OP, could you possibly clue me in on this weeks Powerball numbers, PLEASE :D 
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a b } Memory
a b K Overclocking
March 15, 2010 12:28:48 AM

RJR said:
Crash that's pretty good without any info back from the OP, could you possibly clue me in on this weeks Powerball numbers, PLEASE :D 


Dude, I'm not just taking a shot in the dark, I own two sets of that RAM and the previous revision of that board!
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a b K Overclocking
March 15, 2010 3:13:26 AM

OK, so NO Powerball numbers, be that way. :( 
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a b } Memory
a b K Overclocking
March 15, 2010 6:42:26 AM

RJR said:
OK, so NO Powerball numbers, be that way. :( 


06 16 20 31 36 08
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a b K Overclocking
March 15, 2010 2:38:15 PM

THANKS!!!!!!! I'll let you know if I hit the jackpot. :D 
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a b } Memory
a b K Overclocking
March 15, 2010 7:52:14 PM

RJR said:
THANKS!!!!!!! I'll let you know if I hit the jackpot. :D 


No problem! I knew you were looking for proven solutions, so I gave you a former winning combo!
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March 19, 2010 5:41:25 PM

Ok I realize you guys have been talking Intel but I kind of have the same issue with my setup. Here is what I have:

AMD 955
A-Data DDR3-2000 4GB dual channel kit
ASUS M4A79XTD-EVO
AMD Overdrive (AOD)

I'm not super concerned with overclocking the 955 yet because its still got that new cpu smell. :)  Although I know that I will have to overclock it in order to get to DDR3-2000. I would just like to get my RAM running at its rated speed. I was able to get it to 1600 (from 1333) in the bios by manually changing the speed and voltage to 1.66V. Then I changed the timings in AOD to 9-9-9-24. I'm just not sure what I should do now. I can manually change the timings in the bios OR in AOD. And since I have AOD I can up the HT ref. clock but I have to take it to 250MHz to reach DDR3-2000. My RAM is rated to run at 2000 @ 9-9-9-24 @ 1.65V. And even though everybody is saying that the EVO board only goes up to 1800, if you look at the QVL from ASUS they have a section for DDR3-2000 RAM. If there is anyone who can help I would be greatly appreciative. Let me know if you need any more info.
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March 29, 2010 4:13:19 PM

Can anyone help me? :bounce: 
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a b } Memory
a b K Overclocking
March 29, 2010 10:13:33 PM

atoddvr6 said:
Ok I realize you guys have been talking Intel but I kind of have the same issue with my setup. Here is what I have:

AMD 955
A-Data DDR3-2000 4GB dual channel kit
ASUS M4A79XTD-EVO
AMD Overdrive (AOD)

I'm not super concerned with overclocking the 955 yet because its still got that new cpu smell. :)  Although I know that I will have to overclock it in order to get to DDR3-2000. I would just like to get my RAM running at its rated speed. I was able to get it to 1600 (from 1333) in the bios by manually changing the speed and voltage to 1.66V. Then I changed the timings in AOD to 9-9-9-24. I'm just not sure what I should do now. I can manually change the timings in the bios OR in AOD. And since I have AOD I can up the HT ref. clock but I have to take it to 250MHz to reach DDR3-2000. My RAM is rated to run at 2000 @ 9-9-9-24 @ 1.65V. And even though everybody is saying that the EVO board only goes up to 1800, if you look at the QVL from ASUS they have a section for DDR3-2000 RAM. If there is anyone who can help I would be greatly appreciative. Let me know if you need any more info.


Ok, use 250 MHz reference clock to reach DDR3-2000. You might have to reduce your other HT ratios to 8x to keep the CPU stable. As for the CPU speed, you can add more core voltage or reduce the multiplier to stabilize it.
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March 30, 2010 12:46:39 AM

Crashman said:
Ok, use 250 MHz reference clock to reach DDR3-2000. You might have to reduce your other HT ratios to 8x to keep the CPU stable. As for the CPU speed, you can add more core voltage or reduce the multiplier to stabilize it.


As far as the HT ratio goes, I only see one and it adjusts the HyperTransport speed. Is that what you are talking about? What other HT ratios are there? If I set the reference clock to 250 and the HT Multiplier to 8x and the CPU ratio to 13x, that gets me to DDR3 2000 with my CPU at stock clock. This is all in AOD without hitting "Apply". I suppose I just need to run some test to see if I need to mess with voltages? Thanks for your help!
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a b } Memory
a b K Overclocking
March 30, 2010 1:48:22 AM

atoddvr6 said:
As far as the HT ratio goes, I only see one and it adjusts the HyperTransport speed. Is that what you are talking about? What other HT ratios are there? If I set the reference clock to 250 and the HT Multiplier to 8x and the CPU ratio to 13x, that gets me to DDR3 2000 with my CPU at stock clock. This is all in AOD without hitting "Apply". I suppose I just need to run some test to see if I need to mess with voltages? Thanks for your help!


That works for AOD, but there are actually two sets of HT links. One is internal, between the CPU core and memory controller, and the other is external, between the CPU core and Northbridge. They have different names in BIOS, and you might have to adjust both of them to get perfect stability.
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March 30, 2010 9:25:57 PM

Crashman said:
That works for AOD, but there are actually two sets of HT links. One is internal, between the CPU core and memory controller, and the other is external, between the CPU core and Northbridge. They have different names in BIOS, and you might have to adjust both of them to get perfect stability.


Got it. So which settings are best changed in the BIOS and which are best changed in AOD? It seems that memory timings are best changed in the BIOS because I will change a timing in AOD and if I restart, or my computer goes to sleep, the timings go back to where they were. Just curious.
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a b } Memory
a b K Overclocking
March 30, 2010 11:13:20 PM

atoddvr6 said:
Got it. So which settings are best changed in the BIOS and which are best changed in AOD? It seems that memory timings are best changed in the BIOS because I will change a timing in AOD and if I restart, or my computer goes to sleep, the timings go back to where they were. Just curious.


I do everything in BIOS. AOD can be handy for tuning without rebooting, but once you know what settings to use you can permanently set them in BIOS.
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April 1, 2010 5:35:18 PM

Crashman said:
I do everything in BIOS. AOD can be handy for tuning without rebooting, but once you know what settings to use you can permanently set them in BIOS.


Agreed, doing everything in the BIOS is the best way. Thank you very much for all your help! :D  I will post the final results as soon as I can. In case anyone wants to know.
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