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While still ‘in beta’, ASUS pro overclockers, Shamino and Andre Yang show us the potentials of LN2 overclocking on the upcoming Maximus V Formula. These details are taken from the Kingpincooling thread, although you can discuss it in our own ROG forums here.

Below, the explanations are in their own words:

Maximus V Formula OC Preview & Maximus V GENE  Overclocking Demo

Firstly, to engage LN2 Mode, simply put a jumper at the location marked below:

M5F LN2 Mode

LN2 Mode Enabled:

M5F LN2 Mode Enabled

The BIOS will show the ‘Enabled’ status and give you two Extreme OC Profiles that are suitable for users of Liquid Nitrogen. Profile 1 is more conservative and profile 2 is more aggressive.

BIOS Extreme Profiles
To make a simple ‘Slow-Mode’ switch, simply connect a wire from the spot marked below to a switch, with the other side of the switch being any local ground. Slow Mode is a common method used to make it easier to enter OS and validate results, etc

BIOS Extreme Profiles

Points to watch when running LN2 Cooling for the best cold-bug free runs:

  • Use a BCLK of 105MHz or higher
  • Find the right CPU PLL Voltage that your CPU likes (can be higher or lower than default)
  • Some CPUs may only initialize their high IMC Frequency at a warmer temperature though they may work fine after that
  • A ‘23’ code when trying to boot means the CPU IMC is not able to run at that frequency at that temperature. A ‘30’ means the same as ‘23’ and a bit more.
  • The highest DRAM Ratio known to be working = 2933 ratio

With the CPU and PSC chip DRAM under LN2, you can get the Maximus V Formula to churn out some crazy OC numbers, such as 2x2GB @ 3036MHz CL6-11-7-1T!

Power users love running low latencies, right? Do you miss the days of CL5, but still want today’s memory frequencies? How about CL5 @ 2400MHz!

2400CL5

The above was done with Elpida BBSE chips using our tight Elpida BBSE BIOS preset as a base setting.

The Maxmius V Formula can go crazy high with VDimm and IMC-DRAM Offset, which is great for LN2’d memory. We will issue a note on IMC-DRAM Offset to trick the IMC at a later date. Please be warned not to try to use 2.40V Vcore as shown below. There is very little chance of your CPU surviving – or if your intention is otherwise….

M5F DDR voltage

Maximus V Formula 2x2GB @ 2933MHz CL5-11-7-28 (What is CL5 good for? SuperPi 32M! Which you will see posted later. It requires lots of VDIMM and Elpida BBSE chips as cold as possible

A note on LN2’d DRAM

  • PSC scales on cold but beyond that it’s unnecessary and it might not even work too cold. Around -40ºC is enough to max out the DRAM and it may scale up to around ~1.95V.
  • Elpida BBSE really scales on cold; the colder the better. Voltage scales up to ~2.30V
  • Samsung are better just slightly chilled, with colder getting worse. Voltage scales up to ~2.20V
  • Hynix scales on cold but beyond that it’s unnecessary and it might not even work too cold. Around -40ºC is enough to max out the DRAM and it may scale up to around ~1.95V.

Following the ROG Rampage IV Series success, we created a ton of presets for different memory chips in the BIOS:

Maximus V Formula memory chip presets

  • PSC are almost always 2GB sticks, and typically have rated RAS to CAS Delay much higher than CAS, for eg 8-11-8, 9-11-9, etc
  • Hynix presets are for 4GB sticks that are usually rated 2133MHz or more, and have slopping upwards and then downwards rated timing, such as 9-11-10, 10-12-11. They normally don’t scale much past 1.67v as well.
  • Samsung presets are for 4GB sticks that are usually rated 2133MHz or more and have slopping upwards and then evening out rated timing, such as 10-12-12. They normally scale up to 1.80v and can do unusually low TRAS at high speeds, such as 21.

Even with fully loaded DRAM slots of 4x4GB, we’ve tuned the Maximus V Formula enough to run 4x4GB @ 3180MHz!


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