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post #21 of 37
Thread Starter 
Quote:
Originally Posted by RuSo
source here:http://www.valueram.com/datasheets/K...200AK2%2F1G%22

Timing Reference: 2-3-2-6-1 at +2.6V
Also what do you mean by +2.6V. Under "DIMM OverVoltage Control", it only gives me the option of +.1v and +.2v. And I don't know what the current voltage is either..
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post #22 of 37
i only looked for the pdf with the specs of your modules the +.1 means yor ram goes from 2.6v to 2.7v +.2 means it goes from 2.6v to 2.8v
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post #23 of 37
Quote:
Originally Posted by kurtdh
KHX3200AK2/1G

times two
Hello

I would like to comment on this as this is a favoured topic of mine.

You have stated your modules are KHX3200AK2/1G

The Kingston Hyper-X numbering system is as follows:

KHX3200AK2/1G = Winbond CH-5 IC's
KHX3200K2/1G = Winbond BH-5 IC's
KHX3200ULK/1G = Samsung TCCD IC's

What this means is that your modules use CH-5 chips on them. These typically have timings of 2-3-2-6 which are low latency modules that need a fair bit of voltage to maintain these timings.

When overclocking these I would keep the timings at 2-3-2-6 and adjust the voltage to maintain stability.
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post #24 of 37
Thread Starter 
Quote:
Originally Posted by RuSo
i only looked for the pdf with the specs of your modules the +.1 means yor ram goes from 2.6v to 2.7v +.2 means it goes from 2.6v to 2.8v
Is it safe to run it at 2.8v? And should I?
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post #25 of 37
Quote:
Originally Posted by kurtdh
Is it safe to run it at 2.8v? And should I?
My Kingston modules (But different type) are running at 3.0v at the moment with no issues what so ever. My modules (BH-5) could take upto 3.5v or so.

The CH-5 modules dont like voltage quite so much so if you keep them at less than 3.1v you will be ok. Since your board probably tops out at 2.8v VDIMM then i would run it at that. This limited voltage will probably hinder your overclock somewhat meaning you will need to use memory dividers.

As a comparison my modules will run 2-2-2-5 (3.4v) at 250MHz (DDR500) but require lots of volts and active cooling. As such the only boards that really take advantage of these modules are from the likes of DFI.

Source: http://www.techpowerup.com/memdb/
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post #26 of 37
Quote:
Originally Posted by MjrTom
Hello

I would like to comment on this as this is a favoured topic of mine.

You have stated your modules are KHX3200AK2/1G

The Kingston Hyper-X numbering system is as follows:

KHX3200AK2/1G = Winbond CH-5 IC's
KHX3200K2/1G = Winbond BH-5 IC's
KHX3200ULK/1G = Samsung TCCD IC's

What this means is that your modules use CH-5 chips on them. These typically have timings of 2-3-2-6 which are low latency modules that need a fair bit of voltage to maintain these timings.

When overclocking these I would keep the timings at 2-3-2-6 and adjust the voltage to maintain stability.
he couldnt get them stable at stock with these settings... could the fact that he has 4 modules play any part?

and about the voltage im not sure but Mjrtom has these modules so he is more experienced with them... maybe try your modules first one at a time then two at a time (dual channel) and check for errors, it could be a faulty module...
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post #27 of 37
Thread Starter 
Quote:
Originally Posted by MjrTom
Hello

I would like to comment on this as this is a favoured topic of mine.

You have stated your modules are KHX3200AK2/1G

The Kingston Hyper-X numbering system is as follows:

KHX3200AK2/1G = Winbond CH-5 IC's
KHX3200K2/1G = Winbond BH-5 IC's
KHX3200ULK/1G = Samsung TCCD IC's

What this means is that your modules use CH-5 chips on them. These typically have timings of 2-3-2-6 which are low latency modules that need a fair bit of voltage to maintain these timings.

When overclocking these I would keep the timings at 2-3-2-6 and adjust the voltage to maintain stability.
Ok, so to follow what you're saying. I should set ram to 2-3-2-6. Then make sure the divider is 1:1 ratio. Then find max FSB, and set it to that?

Or would it be better to run 2-4-4-6, with a 1:1 divider, in order to find an even better max FSB?

And would you suggest I have DIMM overvoltage set to +.2 at all times? Or +.1, or none?
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post #28 of 37
Thread Starter 
Quote:
Originally Posted by MjrTom
My Kingston modules (But different type) are running at 3.0v at the moment with no issues what so ever. My modules (BH-5) could take upto 3.5v or so.

The CH-5 modules dont like voltage quite so much so if you keep them at less than 3.1v you will be ok. Since your board probably tops out at 2.8v VDIMM then i would run it at that. This limited voltage will probably hinder your overclock somewhat meaning you will need to use memory dividers.

As a comparison my modules will run 2-2-2-5 (3.4v) at 250MHz (DDR500) but require lots of volts and active cooling. As such the only boards that really take advantage of these modules are from the likes of DFI.

Source: http://www.techpowerup.com/memdb/
And I'm not sure if my board tops out at that voltage or not. I do know that the bios only has +.1v and +.2v to offer me, though, and seem to have no effect on how high I can get my FSB when testing stability with memtestx86.
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post #29 of 37
if you know at a 1:1 fsb/ram ratio you top out at around 227mhz or something like that, then you should use a divider.

I think you should use a really low divider so your ram is running as slow as possible, that way you can find the max fsb your board supports and the max cpu speed at the same time.

Once you have found that out you can start to raise you ram speed back up

I reckon if you up the vdimm voltage to the max you might be able to get 2-2-2-6-1 at 200mhz if your lucky
    
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post #30 of 37
wow quick responces!

To answer your Q's

Yes I would run them always at 2.8v. This is still well within the limits of the JDEC specs for DDR modules so you wont damage them. Ideally they should be run at 2-3-2-6 but you might need a bit more voltage (which you cant) to get them to run at this.

I would try each module on their own as suggested just to rule out a less performing module that may be holding you back. It may also be worth adjusting the command rate (CPC) from 1T to 2T (Enabled/Disabled) when using all 4 modules as this can help greatly with stability but only affects performance slightly.

Using mine as a reference, 2.8v would give me about DDR430 (215MHz FSB) at 2.8v using 2-2-2-6 so in your case it will be similar results but with timings of 2-3-2-6 instead.

EDIT: Nice post Mootin, although he wont be able to run 2-2-2-6 but 2-3-2-6
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