GSkill 2800 with Haswell Refresh

[Hopper64]

I have some GSkill memory left over from last year I could never use (F3-2800C12D-16GTXDG) because of the Haswell CPU I was using. Never got it stable at 2800, or at 2400, etc for that matter. Ended up replacing both the CPU and the memory with what's in my sig. Now that we will have the i7 4790K soon, does anyone know yet if I can use this 2800 stuff? Be nice to get the memory to that speed. Thanks.

[Sabishii_Hito]

It will depend on your individual CPU's integrated memory controller more so than on the board, though I've never heard of a Haswell chip that couldn't do DDR3-2400 at least while keeping the core clock at stock speed.

[Hopper64]

Yea, the first 4770K I had last year was so unstable at anything above 1600. It was quite frustrating. I hope the new chip is better with this. I had seen rumors that the memory controller was moved back to the board and off the CPU, but I don't think that's accurate. Thanks for your reply.

[Cybertronic]

I have G.SKill 2800 memory, and it works fine on my 4770K. I even clocked it down from 2 to 1 T. I did have to bump the SA and Digital and Analog IO voltages up quite a bit for it to even post, and then be stable. (Nothing crazy though)

[Hopper64]

Yea, I tried everything with mine. Spoke with GSkill techs and still never had a stable system. Messed with the voltages as well, still no luck. Hoping the new chips will solve this.

[Nate152]

Here is my 3770k doing 2800Mhz. on the RAM. My first 3770k could not do it. It does depend on the imc on the cpu whether it can hit 2800MHz.

[jab383]

When having trouble with higher DRAM clocks, check Vccsa first then a few other things. A Vccsa step-up of 0.1 to 0.2 often works wonders. See the guide:

http://rog.asus.com/254052013/maximus-motherboards/recommended-settings-for-overclocking-maximus-vi-...

I don't see any reason the 4790K would be much better than 4770K on the average. There's the rub. Haswells have such a wide range of performance that they can't be compared to each other. I think you have as much chance getting a good performing 4790K as with any other dip into the lottery. The 4790K advantage is supposed to be in the internal TIM and cooling, which is the deciding factor for me.

Jeff

[Hopper64]

Thanks. I will try this memory when I have the new hardware. I hate having this just sit around this long.