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Haswell Overclocking Guide [With Statistics] - Page 393

post #3921 of 19580
so if someone put memory that is 1.65v in haswell system, the IMC will degraded few years / month or so. the only problem is that on ASUS Gene VI mobo, memory QVL has some 1.65 memory in it.
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post #3922 of 19580
Quote:
Originally Posted by rickyman0319 View Post

so if someone put memory that is 1.65v in haswell system, the IMC will degraded few years / month or so. the only problem is that on ASUS Gene VI mobo, memory QVL has some 1.65 memory in it.

These boards all support 1.65v but not for everyday regular use, its moreso for benchmarking and if you don't plan on keeping the CPU for awhile.
Edited by byardz - 10/16/13 at 1:55pm
post #3923 of 19580
Quote:
Originally Posted by byardz View Post

What a lot of OCN'ers don't realize is that 1.65v was the 1.575 of the 1st gen i7s.

1.575v is the do not exceed cap of the 2nd gens and up.

Nope, the i7-9xx series also had the same voltage limits for the Vddq.
post #3924 of 19580
Quote:
Originally Posted by Forceman View Post

Nope, the i7-9xx series also had the same voltage limits for the Vddq.

Link
post #3925 of 19580
Quote:
Originally Posted by byardz View Post

Link

Table 2-7:

http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/core-i7-900-ee-and-desktop-processor-series-datasheet-vol-1.pdf

I tried to upload the image, but apparently that is blocked here at work. FWIW, you are also using the wrong chart in your posts - the chart for Haswell chips is Table 47 of the 4th Gen Datasheet.

http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-family-desktop-vol-1-datasheet.pdf

Edit: Got around the picture issue, here's Table 2-7 from the 1st Gen Datasheet.

920_zpsbba66577.jpg
Edited by Forceman - 10/16/13 at 2:19pm
post #3926 of 19580
I'm late to this discussion. So the memory I have which the factory specifications of 1.65v will cause future issues? Utilizing XMP or auto overclocking will result in 1.65v. I find this hard to believe, what is everyone running? 1.55? Would 2400 mem overclocked to almost 2900 even run on 1.5? lol
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231589
Designed for 3rd Generation Intel Core Processors and Z77 platform.
Intel XMP 1.3 Ready for 3rd Generation Intel Core Processors.
Recommended Intel Core i7-3770K processors & Core i5-3570K processors for best performance.
post #3927 of 19580
Quote:
Originally Posted by BGKris View Post

I'm late to this discussion. So the memory I have which the factory specifications of 1.65v will cause future issues? Utilizing XMP or auto overclocking will result in 1.65v. I find this hard to believe, what is everyone running? 1.55? Would 2400 mem overclocked to almost 2900 even run on 1.5? lol
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231589
Designed for 3rd Generation Intel Core Processors and Z77 platform.
Intel XMP 1.3 Ready for 3rd Generation Intel Core Processors.
Recommended Intel Core i7-3770K processors & Core i5-3570K processors for best performance.

This aimed at people who benchmark.

Also forceman, interesting image you posted there.
post #3928 of 19580
What the consensus on using a Fixed Vcore 24/7? I see a lot of people recommend adaptive but it's a pain if you know you are AVX stable at a certain voltage and it just gets overwritten with a voltage associated with your multiplier (i.e you set 1.15v at a 43x Multi and AVX jumps to 1.25v) . Maybe offsets the way to go but then it offsets idle voltages too.
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post #3929 of 19580
A picture from Intel Ram compatibility List :


And :

I5 http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/core-i5-processor-memory-datasheet.pdf

I7 http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/core-i7-memory-suppliers-datasheet.pdf

If 1.65v is not OK for Haswell then why are 1.65 v modules in these lists ??
4670K and 4770K clearly listed compatible with some 1.65v modules.
Edited by Alxx - 10/16/13 at 4:22pm
post #3930 of 19580
Quote:
Originally Posted by byardz View Post

If you guys want to look stupid.

Read this:

"G.Skill Trident X Series 8GB (2 x 4GB) DDR3-2400 Memory operating voltage of 1.65V exceeds the Intel Haswell CPU recommended maximum of 1.5V+5% (1.575V). This memory module may run at a reduced clock rate to meet the 1.5V voltage recommendation, or may require running at a voltage greater than the Intel recommended maximum

What a lot of OCN'ers don't realize is that 1.65v was the 1.575 of the 1st gen i7s.

1.575v is the do not exceed cap of the 2nd gens and up.

Good luck burning your IMCs thumb.gif

Seriously dude
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