7700HQ memory settings DDR4 - confused!

[Jimbo Mahoney]

Hi all,

Once again, I've been out of the overlcocking scene and upon returning, I'm thoroughly confused by the memory speeds!

I'm running a 7700HQ and 2400 DDR4 RAM.

Here's what I do know (or think I know):

1) 7700HQ is locked. 28x multiplier and 100 MHz BCLK with up to 38x turbo on a single core or 34x on all four cores.

2) It's got 2400 DDR4, which is running a 1.33 ratio to the BCLK.

Here's where I get confused...

I *think* that 2400 DDR4 is running clock-doubled 1200 MHz.

But if that's the case, why is it running at 1333 MHz? Does this mean that it's actually running @ 2666 (and therefore overclocked already?)

...and some questions:

1) It looks like I can adjust the memory voltage and the ratio. Does this mean I can adjust the ratio to things like 1.5 and 1.66 (or even 2) to get the memory running faster?

2) What is 2400 DDR4 *supposed* to run at? 1200 MHz I guess?

 

[Jimbo Mahoney]

OK, I think I understand it now.

Take for example the screenshot at the following location:

http://m.hardocp.com/article/2016/12/22/core_i77700k_kaby_lake_corsair_ram_overclocking

This shows a 7700K running at 45 x 100. So far so good.

But wait, the memory is running at 1800 MHz on a 1:27 FSB: DRAM ratio?! How does that make sense?

I finally figured it out from a comment in another thread I found - that the memory can use either a 100 MHz or a 133 MHz base clock.

Therefore, 27 x 133 = 3591, which explains the 1800 MHz (3591 / 2 = 1795).

I'll power up CPU-Z on my system and take a look...

 

[Admiral Huddy]

What's the memory strap ? If i remember correctly it's the BCLK x memory strap to get the desired memory frequency?

 

[willhub]

So is the memory actually running overclocked? What laptop you got?

 

[Jimbo Mahoney]

No - it's running stock now that I understand it.

Medion Erazer X7853 - 7700HQ, 16GB 2400 MHz, 1070

I think the 1.33 BCLK ratio means that it's running on a 133 MHz frequency and an 18 multiplier = 2400 MHz