Kingston HyperX Genesis Grey 8GB with Haswell CPU

maxmannn · Apr 22, 2014

My CPU is the Intel Core i5-4440 3.1GHz Quad-Core and the RAM I've ordered is as in the title.

I'm a bit confused though, PCPartPicker gives me this warning:
"Kingston HyperX Grey 8GB (2 x 4GB) DDR3-1600 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."

But wherever I look I'm getting conflicting reports. Amazon, for instance, states 1.65v, Overclockers.co.uk states 1.5v - 1.65v and a pdf on the Kingston website just says 1.5v (http://www.kingston.com/datasheets/KHX1600C9D3X2K2_8GX.pdf).

What is the truth? Will I have to reduce the clock rate?

FYI my motherboard is the Asus Maximus VI Impact Mini ITX LGA1150.

Thanks

i7Baby · Apr 22, 2014

Have a look at the mobo approved memory list to see if they checked it and said OK.

Then check with Kingston to see if they've tested it o the mobo and found it OK.

If none have, don't use it.

Shaun o · Apr 22, 2014

JEDEC standard latency DDR3-1333 timing of 9-9-9 at 1.5V

Well clear this up Xmp mode is technically overclocking memory.
Now in normal cases when overclocking the voltage sometimes has to be in creased to avoid memory errors. The faster you run it in frequency, the more power it requires to keep it stable, and efficient signal transmission.

It requires more power to keep stable, and avoid memory errors.

The xmp mode of your bios, if enabled should set the voltage to 1.65v for the required speed of 1600Mhz.

The warning is for a board that does not contain or have an Xmp mode option in the bios.

It would mean you would have to set the values, labeled on the stick manually in the bios to do with the Jedec 4 standard. based on the timing values it gives and the voltage plus the speed setting.

Maximus supports 1.5.v up to 1.65v for xmp mode.

I should add even if you could run the memory at 1333Mhz speed, once in windows if you install and run cpu z you could obtain the values of Jedec 4 settings via the memory profiles stored on the stick.

All Xmp does is read these, and set them in the bios, Auto configure cased on the pre stored settings table of the Jedec stated settings.

Xmp auto selects the highest Jedec standard value the memory can run at stored as a setting on the memory module.

If you have heard of the term Plug and play.
Xmp is basically that option for memory.

You board quotes the speed it can run at under xmp mode, and contains the option in the bios.

maxmannn · Apr 22, 2014

Thanks for the replies.

I looked at the recommended memory list for the motherboard and it wasn't on there. This was though

Kingston 8GB (2x4GB) DDR3 1600MHz HyperX Genesis Plug N Play Memory Kit CL9 1.5V

So I've ordered that instead. Thanks for all the help.

Tradesman1 · Apr 22, 2014

Those should be fine, Kingston has a number of sets of 1600 sticks that require 1.6-1.65 which is sort of ridiculous for entry level 1600 sticks, about 90+ % of all 1600 sticks, even high performance CL 7 and 8 sticks run on 1.5 or less...As far as your sticks go, when you install will simply have to go into BIOS and enable XMP, select profile 1 and should be at 1600

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