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Overclocking & Choosing RAM for Socket 1155 - Page 15

post #141 of 456
Quote:
Originally Posted by razamit View Post
Hi

I dont understand something. I hear everywhere that if you have SB get your ram sticks with <1.5V but then every one overclocks them to be faster but with 1.65V

Isnt that abit contradicting?
hmm.. how so? you usually need more voltage to scale up in frequency (overclocking) without going into the technical aspects of it, that's just how most hardware works... if you want it to go faster you need to put more juice into it to make it go... sorta speak

however certain low voltage kits like the kingston lovo, and gskill eco (1st is rated for 1.25v, second for 1.35v)
only scale up in voltage to a certain point.. usually bellow 1.65 and won't overclock higher no matter how many volts you put into it.
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post #142 of 456
Because they know how to do it safely.
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post #143 of 456
I know that if you wanted to go faster you have to put more juice into it, I just said it contradicts the fact the on one hand you say get it under 1.5V to fit SB and on the other hand you overclock it to 1.65V.

and regarding the 0.5V defecit to the CPU if you OC your CPU and it takes 1.3V does that mean you can go 1.8V on the Ram? provided it can take it of course
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post #144 of 456
Thread Starter 
Quote:
Originally Posted by razamit View Post
I know that if you wanted to go faster you have to put more juice into it, I just said it contradicts the fact the on one hand you say get it under 1.5V to fit SB and on the other hand you overclock it to 1.65V.

and regarding the 0.5V defecit to the CPU if you OC your CPU and it takes 1.3V does that mean you can go 1.8V on the Ram? provided it can take it of course
First of all there is nothing wrong with RAM that are rated 1.65v, hell they even market some of them for SB. One of the biggest reason that people say go for the 1.5v RAM is beacause the voltage is lower than the standard 1.65v and the other reason is because it says 'made for sandybridge', which IMHO is marketing at it's finest.

Think of it this way, if the lower volwer voltage 1.35v/1.25 RAM was marketed as 'made for sandybridge' and the 1.5v didn't, people will fall onto the bandwagon and majority would recommend it those ones instead but majority aren't really aware of the lower 1.25/1.35v ones.

The 0.5v is in regards to the VTT/QPI with the DRAM, so if the DRAM voltage is at 1.65v then it's recommended to have the VTT (aka VCCIO) to be within 0.5v of it, at the 1.15v region.
Edited by munaim1 - 9/3/11 at 7:08am
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post #145 of 456
Quote:
Originally Posted by munaim1 View Post
First of all there is nothing wrong with RAM that are rated 1.65v, hell they even market some of them for SB. One of the biggest reason that people say go for the 1.5v RAM is beacause the voltage is lower than the standard 1.65v and the other reason is because it says 'made for sandybridge', which IMHO is marketing at it's finest.

Think of it this way, if the lower volwer voltage 1.35v/1.25 RAM was marketed as 'made for sandybridge' and the 1.5v didn't, people will fall onto the bandwagon and majority would recommend it those ones instead but majority aren't really aware of the lower 1.25/1.35v ones.

The 0.5v is in regards to the VTT/QPI with the DRAM, so if the DRAM voltage is at 1.65v then it's recommended to have the VTT (aka VCCIO) to be within 0.5v of it, at the 1.15v region.
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post #146 of 456
Quote:
Originally Posted by razamit View Post
I know that if you wanted to go faster you have to put more juice into it, I just said it contradicts the fact the on one hand you say get it under 1.5V to fit SB and on the other hand you overclock it to 1.65V.

and regarding the 0.5V defecit to the CPU if you OC your CPU and it takes 1.3V does that mean you can go 1.8V on the Ram? provided it can take it of course
the whole thing about 1.575v being max is this ;
"DDR3 memory provides a reduction in power consumption of 30% compared to DDR2 modules due to DDR3's 1.5 V supply voltage, compared to DDR2's 1.8 V or DDR's 2.5 V. The 1.5 V supply voltage works well with the 90 nanometer fabrication technology used in the original DDR3 chips. Some manufacturers further propose using "dual-gate" transistors to reduce leakage of current.[1]
According to JEDEC[2] the maximum recommended voltage is 1.575 volts and should be considered the absolute maximum when memory stability is the foremost consideration, such as in servers or other mission critical devices. In addition, JEDEC states that memory modules must withstand up to 1.975 volts before incurring permanent damage, although they are not required to function correctly at that level."
http://en.wikipedia.org/wiki/DDR3_SDRAM

"VDDQ: more commonly known as Vdimm or Vdram, this is the voltage for your memory. Formally known as I/O voltage for DDR3, Intel states maximum at 1.575. YOU should run this at whatever it says on your RAM. At the time I am writing this article, 1.575 is not the standard, but 1.5v has been stock voltage on many DDR3 RAM modules for a long time. While at 1.5v you can run at stock speed of 1333 MHz and SPD 9, 9,9,24 to run your RAM at a higher speed, such as 1600MHz, most RAM requires 1.65v. Do not be afraid, if it says 1.65v on your RAM stick, set it to 1.64 or 1.66v. For overclocking higher than what your RAM is rated for you can take this up, I have used up to 1.76v, but for my tests I used 1.72v to run my 1600mhz Ram at 1866mhz. I wouldn’t run this voltage over 1.8v unless you are going for some crazy high clocks."
http://www.overclock.net/intel-gener...uide-p67a.html
Edited by coolhandluke41 - 9/3/11 at 8:19am
    
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post #147 of 456
OK go it.

Thanks!!!

I have one more question. What is more important: the Latencies or the speed?

because if you want speed you have to highten your latencies
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post #148 of 456
Please read the first post in this thread!
all links included.
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post #149 of 456
This thread is so helpful. And everytime I read this thread I try to lower the 2T value to 1T (@1.65v and 1.15 VCCIO) and I get nothing but rounding errors in P95 grrr.
post #150 of 456
you can compare it here;



run 2T and forget about it
and here is different kit lower latency 1T for comparison ,as you can see SB loves frequency

Edited by coolhandluke41 - 9/3/11 at 11:27am
    
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